test(core): simplify permission layer wiring

test(opencode): simplify message pagination layer wiring (#33157 )
test(opencode): simplify session retry layer wiring (#33155 )
2026-06-20 22:16:18 -04:00 · 2026-06-20 21:44:37 -04:00 · 2026-06-20 21:44:02 -04:00 · 2026-06-20 21:43:03 -04:00 · 2026-06-21 00:19:31 +00:00 · 2026-06-21 00:03:08 +00:00
468 changed files with 19267 additions and 7747 deletions
@@ -52,6 +52,9 @@ _Avoid_: Request body, wire options
 **Generation Controls**:
 Provider-neutral sampling and output controls, partitioned from provider semantics and compatibility wire fields when model metadata enters the Catalog.

+**PTY Environment**:
+The host-supplied environment overlay applied by the server when creating a PTY, observed for the request Location and resolved PTY working directory.
+
 ## Relationships

 - A **System Context** is an opaque carrier composed from zero or more **Context Sources**.
@@ -99,6 +102,8 @@ Provider-neutral sampling and output controls, partitioned from provider semanti
 - A model/provider switch always starts a new **Context Epoch** while preserving chronological conversation history.
 - **Model Request Options** remain provider-semantic through Catalog resolution. The Session runner maps them into the LLM package's provider-option namespace; the selected protocol adapter alone owns provider wire encoding.
 - **Generation Controls**, protocol-semantic **Model Request Options**, and compatibility request body fields are separate Catalog domains. A shared ingestion adapter partitions legacy and models.dev AI-SDK-shaped options before routing.
+- The **PTY Environment** is a server concern rather than a Core PTY concern. PTY creation merges caller values, then the host overlay, then Core-forced terminal invariants such as `TERM` and `OPENCODE_TERMINAL`.
+- A **PTY Environment** adapter observes plugins in the request Location while passing the resolved PTY working directory to the hook; standalone servers use an empty adapter.
 - A **Mid-Conversation System Message** lowers to the provider's native chronological instruction role when supported and to a wrapped chronological fallback otherwise.
 - When the effective aggregate instruction set changes, its **Mid-Conversation System Message** includes the complete current ordered set and supersedes the prior aggregate value; when no ambient instructions remain, the message states that previously loaded instructions no longer apply.
 - Ambient project instruction discovery honors `OPENCODE_DISABLE_PROJECT_CONFIG`; global instructions remain eligible.
@@ -29,12 +29,13 @@
    },
    "packages/app": {
      "name": "@opencode-ai/app",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@kobalte/core": "catalog:",
        "@opencode-ai/core": "workspace:*",
        "@opencode-ai/sdk": "workspace:*",
        "@opencode-ai/ui": "workspace:*",
+        "@pierre/trees": "1.0.0-beta.4",
        "@sentry/solid": "catalog:",
        "@shikijs/transformers": "3.9.2",
        "@solid-primitives/active-element": "2.1.3",
@@ -52,6 +53,7 @@
        "@solidjs/meta": "catalog:",
        "@solidjs/router": "catalog:",
        "@tanstack/solid-query": "5.91.4",
+        "@tanstack/solid-virtual": "catalog:",
        "@thisbeyond/solid-dnd": "0.7.5",
        "diff": "catalog:",
        "effect": "catalog:",
@@ -65,7 +67,6 @@
        "solid-js": "catalog:",
        "solid-list": "catalog:",
        "tailwindcss": "catalog:",
-        "virtua": "catalog:",
      },
      "devDependencies": {
        "@happy-dom/global-registrator": "20.0.11",
@@ -85,7 +86,7 @@
    },
    "packages/cli": {
      "name": "@opencode-ai/cli",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "bin": {
        "lildax": "./bin/lildax.cjs",
      },
@@ -110,7 +111,7 @@
    },
    "packages/console/app": {
      "name": "@opencode-ai/console-app",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@cloudflare/vite-plugin": "1.15.2",
        "@ibm/plex": "6.4.1",
@@ -146,7 +147,7 @@
    },
    "packages/console/core": {
      "name": "@opencode-ai/console-core",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@aws-sdk/client-sts": "3.782.0",
        "@jsx-email/render": "1.1.1",
@@ -173,7 +174,7 @@
    },
    "packages/console/function": {
      "name": "@opencode-ai/console-function",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@ai-sdk/anthropic": "3.0.82",
        "@ai-sdk/openai": "3.0.48",
@@ -195,7 +196,7 @@
    },
    "packages/console/mail": {
      "name": "@opencode-ai/console-mail",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@jsx-email/all": "2.2.3",
        "@jsx-email/cli": "1.4.3",
@@ -219,7 +220,7 @@
    },
    "packages/console/support": {
      "name": "@opencode-ai/console-support",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@cloudflare/vite-plugin": "1.15.2",
        "@opencode-ai/console-core": "workspace:*",
@@ -239,7 +240,7 @@
    },
    "packages/core": {
      "name": "@opencode-ai/core",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "bin": {
        "opencode": "./bin/opencode",
      },
@@ -330,7 +331,7 @@
    },
    "packages/desktop": {
      "name": "@opencode-ai/desktop",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@zip.js/zip.js": "2.7.62",
        "effect": "catalog:",
@@ -384,7 +385,7 @@
    },
    "packages/effect-drizzle-sqlite": {
      "name": "@opencode-ai/effect-drizzle-sqlite",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "drizzle-orm": "catalog:",
        "effect": "catalog:",
@@ -398,7 +399,7 @@
    },
    "packages/effect-sqlite-node": {
      "name": "@opencode-ai/effect-sqlite-node",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "effect": "catalog:",
      },
@@ -410,7 +411,7 @@
    },
    "packages/enterprise": {
      "name": "@opencode-ai/enterprise",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@hono/standard-validator": "catalog:",
        "@opencode-ai/core": "workspace:*",
@@ -441,7 +442,7 @@
    },
    "packages/function": {
      "name": "@opencode-ai/function",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@octokit/auth-app": "8.0.1",
        "@octokit/rest": "catalog:",
@@ -457,10 +458,10 @@
    },
    "packages/http-recorder": {
      "name": "@opencode-ai/http-recorder",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
-        "@effect/platform-node": "4.0.0-beta.74",
-        "@effect/platform-node-shared": "4.0.0-beta.74",
+        "@effect/platform-node": "4.0.0-beta.83",
+        "@effect/platform-node-shared": "4.0.0-beta.83",
      },
      "devDependencies": {
        "@tsconfig/node22": "catalog:",
@@ -471,12 +472,12 @@
        "typescript": "catalog:",
      },
      "peerDependencies": {
-        "effect": "4.0.0-beta.74",
+        "effect": "4.0.0-beta.83",
      },
    },
    "packages/llm": {
      "name": "@opencode-ai/llm",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@smithy/eventstream-codec": "4.2.14",
        "@smithy/util-utf8": "4.2.2",
@@ -494,7 +495,7 @@
    },
    "packages/opencode": {
      "name": "opencode",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "bin": {
        "opencode": "./bin/opencode",
      },
@@ -622,7 +623,7 @@
    },
    "packages/plugin": {
      "name": "@opencode-ai/plugin",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@opencode-ai/sdk": "workspace:*",
        "effect": "catalog:",
@@ -660,7 +661,7 @@
    },
    "packages/sdk/js": {
      "name": "@opencode-ai/sdk",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "cross-spawn": "catalog:",
      },
@@ -675,7 +676,7 @@
    },
    "packages/server": {
      "name": "@opencode-ai/server",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@opencode-ai/core": "workspace:*",
        "drizzle-orm": "catalog:",
@@ -689,7 +690,7 @@
    },
    "packages/slack": {
      "name": "@opencode-ai/slack",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@opencode-ai/sdk": "workspace:*",
        "@slack/bolt": "^3.17.1",
@@ -702,7 +703,7 @@
    },
    "packages/stats/app": {
      "name": "@opencode-ai/stats-app",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@ibm/plex": "6.4.1",
        "@opencode-ai/stats-core": "workspace:*",
@@ -735,7 +736,7 @@
    },
    "packages/stats/core": {
      "name": "@opencode-ai/stats-core",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@aws-sdk/client-athena": "3.933.0",
        "@planetscale/database": "1.19.0",
@@ -754,7 +755,7 @@
    },
    "packages/stats/server": {
      "name": "@opencode-ai/stats-server",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@aws-sdk/client-firehose": "3.933.0",
        "@effect/platform-node": "catalog:",
@@ -794,7 +795,7 @@
    },
    "packages/tui": {
      "name": "@opencode-ai/tui",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@opencode-ai/core": "workspace:*",
        "@opencode-ai/plugin": "workspace:*",
@@ -821,12 +822,13 @@
    },
    "packages/ui": {
      "name": "@opencode-ai/ui",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@kobalte/core": "catalog:",
        "@opencode-ai/core": "workspace:*",
        "@opencode-ai/sdk": "workspace:*",
        "@pierre/diffs": "catalog:",
+        "@shikijs/stream": "catalog:",
        "@shikijs/transformers": "3.9.2",
        "@solid-primitives/bounds": "0.1.3",
        "@solid-primitives/event-listener": "2.4.5",
@@ -852,7 +854,6 @@
        "solid-js": "catalog:",
        "solid-list": "catalog:",
        "strip-ansi": "7.1.2",
-        "virtua": "catalog:",
      },
      "devDependencies": {
        "@tailwindcss/vite": "catalog:",
@@ -870,7 +871,7 @@
    },
    "packages/web": {
      "name": "@opencode-ai/web",
-      "version": "1.17.4",
+      "version": "1.17.9",
      "dependencies": {
        "@astrojs/cloudflare": "12.6.3",
        "@astrojs/markdown-remark": "6.3.1",
@@ -912,15 +913,18 @@
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+    "@modelcontextprotocol/sdk@1.29.0": "patches/@modelcontextprotocol%2Fsdk@1.29.0.patch",
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+    "solid-js@1.9.10": "patches/solid-js@1.9.10.patch",
+    "@ai-sdk/google@3.0.73": "patches/@ai-sdk%2Fgoogle@3.0.73.patch",
+    "@ai-sdk/xai@3.0.82": "patches/@ai-sdk%2Fxai@3.0.82.patch",
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+    "pacote@21.5.0": "patches/pacote@21.5.0.patch",
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@@ -931,9 +935,9 @@
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@@ -944,15 +948,17 @@
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-    "@pierre/diffs": "1.1.0-beta.18",
+    "@pierre/diffs": "1.2.10",
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    "@sentry/solid": "10.36.0",
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    "@tailwindcss/vite": "4.1.11",
+    "@tanstack/solid-virtual": "3.13.28",
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@@ -967,7 +973,7 @@
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@@ -978,14 +984,13 @@
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+
+    "astro/shiki/@shikijs/themes": ["@shikijs/themes@3.20.0", "", { "dependencies": { "@shikijs/types": "3.20.0" } }, "sha512-U1NSU7Sl26Q7ErRvJUouArxfM2euWqq1xaSrbqMu2iqa+tSp0D1Yah8216sDYbdDHw4C8b75UpE65eWorm2erQ=="],
+
+    "astro/shiki/@shikijs/types": ["@shikijs/types@3.20.0", "", { "dependencies": { "@shikijs/vscode-textmate": "^10.0.2", "@types/hast": "^3.0.4" } }, "sha512-lhYAATn10nkZcBQ0BlzSbJA3wcmL5MXUUF8d2Zzon6saZDlToKaiRX60n2+ZaHJCmXEcZRWNzn+k9vplr8Jhsw=="],
+
    "astro/unstorage/chokidar": ["chokidar@5.0.0", "", { "dependencies": { "readdirp": "^5.0.0" } }, "sha512-TQMmc3w+5AxjpL8iIiwebF73dRDF4fBIieAqGn9RGCWaEVwQ6Fb2cGe31Yns0RRIzii5goJ1Y7xbMwo1TxMplw=="],

    "astro/unstorage/h3": ["h3@1.15.11", "", { "dependencies": { "cookie-es": "^1.2.3", "crossws": "^0.3.5", "defu": "^6.1.6", "destr": "^2.0.5", "iron-webcrypto": "^1.2.1", "node-mock-http": "^1.0.4", "radix3": "^1.1.2", "ufo": "^1.6.3", "uncrypto": "^0.1.3" } }, "sha512-L3THSe2MPeBwgIZVSH5zLdBBU90TOxarvhK9d04IDY2AmVS8j2Jz2LIWtwsGOU3lu2I5jCN7FNvVfY2+XyF+mg=="],
@@ -2,7 +2,7 @@
 exact = true
 # Only install newly resolved package versions published at least 3 days ago.
 minimumReleaseAge = 259200
-minimumReleaseAgeExcludes = ["@ai-sdk/amazon-bedrock", "@ai-sdk/anthropic", "@opentui/core", "@opentui/core-darwin-arm64", "@opentui/core-darwin-x64", "@opentui/core-linux-arm64", "@opentui/core-linux-arm64-musl", "@opentui/core-linux-x64", "@opentui/core-linux-x64-musl", "@opentui/core-win32-arm64", "@opentui/core-win32-x64", "@opentui/keymap", "@opentui/solid", "opentui-spinner", "gitlab-ai-provider", "opencode-gitlab-auth", "@ff-labs/fff-node", "@ff-labs/fff-bun", "@ff-labs/fff-bin-darwin-arm64", "@ff-labs/fff-bin-darwin-x64", "@ff-labs/fff-bin-linux-arm64-gnu", "@ff-labs/fff-bin-linux-arm64-musl", "@ff-labs/fff-bin-linux-x64-gnu", "@ff-labs/fff-bin-linux-x64-musl", "@ff-labs/fff-bin-win32-arm64", "@ff-labs/fff-bin-win32-x64", "app-builder-lib", "dmg-builder", "electron-builder", "electron-publish"]
+minimumReleaseAgeExcludes = ["@ai-sdk/amazon-bedrock", "@ai-sdk/anthropic", "@opentui/core", "@opentui/core-darwin-arm64", "@opentui/core-darwin-x64", "@opentui/core-linux-arm64", "@opentui/core-linux-arm64-musl", "@opentui/core-linux-x64", "@opentui/core-linux-x64-musl", "@opentui/core-win32-arm64", "@opentui/core-win32-x64", "@opentui/keymap", "@opentui/solid", "opentui-spinner", "gitlab-ai-provider", "opencode-gitlab-auth", "@ff-labs/fff-node", "@ff-labs/fff-bun", "@ff-labs/fff-bin-darwin-arm64", "@ff-labs/fff-bin-darwin-x64", "@ff-labs/fff-bin-linux-arm64-gnu", "@ff-labs/fff-bin-linux-arm64-musl", "@ff-labs/fff-bin-linux-x64-gnu", "@ff-labs/fff-bin-linux-x64-musl", "@ff-labs/fff-bin-win32-arm64", "@ff-labs/fff-bin-win32-x64", "@pierre/diffs", "@pierre/theming", "app-builder-lib", "dmg-builder", "electron-builder", "electron-publish"]

 [test]
 root = "./do-not-run-tests-from-root"
@@ -1,8 +1,8 @@
 {
  "nodeModules": {
-    "x86_64-linux": "sha256-u3CBUflGrE1unVRTvvLKaDkvx5ZHXyRLd/SJOUUsRdc=",
-    "aarch64-linux": "sha256-hUu70IlOXXQ9apQe3IPOdQGf3ZSVCpvRuAWSKxipk/k=",
-    "aarch64-darwin": "sha256-N6Mqmo94q0rsskLcXoUGWCMJjQ9wCuuo0Lby3j6+Dps=",
-    "x86_64-darwin": "sha256-5691VKK2zWqAwe94CCjZuRjXEaswedevFtHxensVLfg="
+    "x86_64-linux": "sha256-g0tDvRf7MErZ1PEeUazEYi492ZHiRT8kYv3bPdkss/I=",
+    "aarch64-linux": "sha256-6sKgf3ftbIqlPxlFkoPzoWPsJp3IwXD+H3Y6g874xmk=",
+    "aarch64-darwin": "sha256-Se/Nls/KlkuK2ysDQ9DeAzSaX3NsL2iDdf/dsv2GIXc=",
+    "x86_64-darwin": "sha256-V9MCkqnvQ1nkD2PaaTfNFKkBZGymj6KxrSAK6+DTF8Y="
  }
 }
@@ -30,9 +30,9 @@
      "packages/slack"
    ],
    "catalog": {
-      "@effect/opentelemetry": "4.0.0-beta.74",
-      "@effect/platform-node": "4.0.0-beta.74",
-      "@effect/sql-sqlite-bun": "4.0.0-beta.74",
+      "@effect/opentelemetry": "4.0.0-beta.83",
+      "@effect/platform-node": "4.0.0-beta.83",
+      "@effect/sql-sqlite-bun": "4.0.0-beta.83",
      "@npmcli/arborist": "9.4.0",
      "@types/bun": "1.3.13",
      "@types/cross-spawn": "6.0.6",
@@ -42,6 +42,8 @@
      "@opentui/core": "0.3.4",
      "@opentui/keymap": "0.3.4",
      "@opentui/solid": "0.3.4",
+      "@tanstack/solid-virtual": "3.13.28",
+      "@shikijs/stream": "4.2.0",
      "ulid": "3.0.1",
      "@kobalte/core": "0.13.11",
      "@types/luxon": "3.7.1",
@@ -51,7 +53,7 @@
      "@tsconfig/bun": "1.0.9",
      "@cloudflare/workers-types": "4.20251008.0",
      "@openauthjs/openauth": "0.0.0-20250322224806",
-      "@pierre/diffs": "1.1.0-beta.18",
+      "@pierre/diffs": "1.2.10",
      "opentui-spinner": "0.0.7",
      "@solid-primitives/storage": "4.3.3",
      "@tailwindcss/vite": "4.1.11",
@@ -59,7 +61,7 @@
      "dompurify": "3.3.1",
      "drizzle-kit": "1.0.0-rc.2",
      "drizzle-orm": "1.0.0-rc.2",
-      "effect": "4.0.0-beta.74",
+      "effect": "4.0.0-beta.83",
      "ai": "6.0.168",
      "cross-spawn": "7.0.6",
      "hono": "4.10.7",
@@ -76,10 +78,9 @@
      "zod": "4.1.8",
      "remeda": "2.26.0",
      "sst": "4.13.1",
-      "shiki": "3.20.0",
+      "shiki": "4.2.0",
      "solid-list": "0.3.0",
      "tailwindcss": "4.1.11",
-      "virtua": "0.49.1",
      "vite": "7.1.4",
      "@solidjs/meta": "0.29.4",
      "@solidjs/router": "0.15.4",
@@ -145,10 +146,13 @@
    "@silvia-odwyer/photon-node@0.3.4": "patches/@silvia-odwyer%2Fphoton-node@0.3.4.patch",
    "@standard-community/standard-openapi@0.2.9": "patches/@standard-community%2Fstandard-openapi@0.2.9.patch",
    "solid-js@1.9.10": "patches/solid-js@1.9.10.patch",
-    "virtua@0.49.1": "patches/virtua@0.49.1.patch",
    "@ai-sdk/xai@3.0.82": "patches/@ai-sdk%2Fxai@3.0.82.patch",
    "gcp-metadata@8.1.2": "patches/gcp-metadata@8.1.2.patch",
    "pacote@21.5.0": "patches/pacote@21.5.0.patch",
-    "@ai-sdk/google@3.0.73": "patches/@ai-sdk%2Fgoogle@3.0.73.patch"
+    "@ai-sdk/google@3.0.73": "patches/@ai-sdk%2Fgoogle@3.0.73.patch",
+    "@tanstack/solid-virtual@3.13.28": "patches/@tanstack%2Fsolid-virtual@3.13.28.patch",
+    "@pierre/trees@1.0.0-beta.4": "patches/@pierre%2Ftrees@1.0.0-beta.4.patch",
+    "@modelcontextprotocol/sdk@1.29.0": "patches/@modelcontextprotocol%2Fsdk@1.29.0.patch",
+    "@tanstack/virtual-core@3.17.0": "patches/@tanstack%2Fvirtual-core@3.17.0.patch"
  }
 }
@@ -1,3 +1,8 @@
+## Priorities
+
+- Prioritise, in this order: stability, simplicity, performance.
+- Before changing session or timeline code, record a production benchmark baseline and compare it after the change.
+
 ## Debugging

 - NEVER try to restart the app, or the server process, EVER.
@@ -0,0 +1,13 @@
+- Prioritize stability, then simplicity, then measurement overhead.
+- Use Playwright for scenario control, isolation, and completion checks.
+- Use Chrome Performance traces for generic browser profiling.
+- Use Electron `contentTracing` for packaged multi-process profiling.
+- Keep custom probes only for product-specific measurements.
+- Do not duplicate measurements across the harness, probes, and traces.
+- Run benchmarks serially to avoid cross-test contention.
+- Run benchmarks against production builds.
+- Keep detailed profiling opt-in when it changes workload behavior.
+- Preserve raw diagnostic data or use lossless representations.
+- Do not enforce machine-dependent performance thresholds.
+- Assert scenario completion and metric collection only.
+- Keep normal test discovery free of manual benchmarks.
@@ -0,0 +1,77 @@
+# Manual app performance suite
+
+The app's high-volume performance diagnostics live under `packages/app/e2e/performance` and are excluded from normal local and CI Playwright discovery. The benchmark config builds the app and serves the production bundle before running scenarios serially.
+
+Run the suite explicitly from `packages/app`:
+
+```sh
+bun run test:bench
+```
+
+PowerShell:
+
+```powershell
+$env:PLAYWRIGHT_WORKERS = "1"
+bun run test:bench
+```
+
+The suite contains:
+
+- cold and hot session-tab timing
+- cached session repaint and mutation tracing
+- streaming timeline throughput, RAF-gap, long-task, geometry, and remount diagnostics
+
+All benchmarks import the shared `benchmark` fixture. Pages created through Playwright's `page` fixture automatically capture main-frame navigation history and emit a Chrome trace when `OPENCODE_PERFORMANCE_TRACE_DIR` is set. Benchmarks that need isolated browser contexts use `withBenchmarkPage`, which owns the context and the same diagnostics lifecycle.
+
+New benchmarks should look like normal Playwright tests:
+
+```ts
+import { benchmark, expect } from "../benchmark"
+
+benchmark("measures one interaction", async ({ page, report }) => {
+  // Only scenario-specific setup and interaction belong here.
+  report({ durationMs: 42 })
+})
+```
+
+The fixture requires every benchmark to call `report()`, automatically names and closes traces, captures navigation history, attaches that history when a test fails, and emits metrics as a consistent `BENCHMARK` JSON line.
+
+```text
+BENCHMARK {"name":"...","context":{"project":"chromium","platform":"darwin"},"metrics":{...}}
+```
+
+Every observed page also emits `BENCHMARK_PAGE` with the same run ID, navigation history, and optional trace path before the final status-bearing `BENCHMARK` record. Chrome traces are browser-wide page-lifetime diagnostics; scenario metrics use narrower explicitly named observation windows.
+
+This follows the stack's own guidance: [Electron recommends repeated Chrome DevTools and Chrome Tracing measurement](https://www.electronjs.org/docs/latest/tutorial/performance), [Chrome DevTools recommends Performance recordings for runtime work](https://developer.chrome.com/docs/devtools/performance), and [Playwright uses traces for test debugging rather than renderer profiling](https://playwright.dev/docs/trace-viewer).
+
+These Playwright benchmarks profile the shared app renderer in Chromium. A future packaged Electron benchmark that needs main-process and multi-process attribution should use Electron's official [`contentTracing`](https://www.electronjs.org/docs/latest/api/content-tracing/) API rather than extending this renderer harness with bespoke process instrumentation.
+
+CPU and high-volume visual profiling are disabled by default. Set `TIMELINE_CPU_PROFILE=1` to enable both, or additionally set `TIMELINE_VISUAL_PROFILE=0` for CPU-only profiling.
+
+The streaming scenario's 30x CPU throttle is a deterministic stress profile, not a simulated end-user device.
+
+Benchmarks do not assert machine-dependent performance budgets. Streaming processes 160 deltas by default and reports renderer-observed completion time, throughput, RAF callback-gap distributions, frame-budget equivalents, and long tasks through final geometry settlement. Delta count and delivery batch are included in result context when overridden. These are main-thread callback diagnostics, not compositor presentation or dropped-frame measurements. Visual-only and geometry metrics are `null` when their probes are disabled. Tab metrics describe sampled DOM observations. Assertions verify scenario and metric collection completion. Repeated repaint states are run-length grouped, but every original observation timestamp is retained alongside raw mutation batches and layout shifts.
+
+Committed smoke and regression tests continue to own correctness coverage for pagination, tab paint, context resize, collapse state, and composer spacing.
+
+## Chrome traces
+
+Set `OPENCODE_PERFORMANCE_TRACE_DIR` to emit a standard Chrome DevTools trace for every benchmark page automatically:
+
+```sh
+OPENCODE_PERFORMANCE_TRACE_DIR=/tmp/opencode-performance-traces \
+bunx playwright test --config e2e/performance/playwright.config.ts \
+  timeline/session-tab-switch-benchmark.spec.ts
+```
+
+The emitted JSON is a standard Chrome trace and can be loaded directly into the Chrome DevTools Performance panel. `devtools-tracing` can optionally inspect it from the command line without adding package scripts or dependencies:
+
+Trace capture mirrors [Puppeteer's official tracing defaults and lifecycle](https://pptr.dev/api/puppeteer.tracing), using Chrome's `ReturnAsStream` transfer mode and failing when Chromium reports trace data loss.
+
+```sh
+bunx devtools-tracing stats <trace-path-from-BENCHMARK_PAGE>
+```
+
+INP analysis requires a trace with a supported navigation/interaction insight. Selector statistics require a trace captured with `OPENCODE_PERFORMANCE_SELECTOR_TRACE=1`.
+
+`e2e/performance/playwright.uncapped.config.ts` disables Chromium frame-rate limiting for explicit uncapped diagnostics. Native product benchmarks should use the default Playwright configuration.
@@ -0,0 +1,144 @@
+import { expect, test as base, type Browser, type Page, type TestInfo } from "@playwright/test"
+import { startChromeTrace } from "./chrome-trace"
+
+type BenchmarkFixtures = {
+  report: (metrics: Record<string, unknown>, context?: Record<string, unknown>) => void
+  reportState: { payload?: { metrics: Record<string, unknown>; context: Record<string, unknown> } }
+  benchmarkResult: void
+}
+
+export type PerformancePageDiagnostics = {
+  navigations: string[]
+  stop: () => Promise<string | undefined>
+}
+
+const pages = new WeakMap<Page, PerformancePageDiagnostics>()
+
+export const benchmark = base.extend<BenchmarkFixtures>({
+  reportState: async ({}, use) => use({}),
+  report: async ({ reportState }, use) => {
+    await use((metrics, context = {}) => {
+      if (reportState.payload) throw new Error("Benchmark reported metrics more than once")
+      reportState.payload = { metrics, context }
+    })
+  },
+  benchmarkResult: [
+    async ({ reportState }, use, testInfo) => {
+      await use()
+      const missing = !reportState.payload
+      console.log(
+        `BENCHMARK ${JSON.stringify({
+          schemaVersion: 2,
+          runID: process.env.OPENCODE_PERFORMANCE_RUN_ID,
+          name: benchmarkName(testInfo),
+          status: missing ? "failed" : testInfo.status,
+          expectedStatus: testInfo.expectedStatus,
+          retry: testInfo.retry,
+          repeatEachIndex: testInfo.repeatEachIndex,
+          context: {
+            project: testInfo.project.name,
+            platform: process.platform,
+            ...reportState.payload?.context,
+          },
+          metrics: reportState.payload?.metrics ?? null,
+          error: missing ? "Benchmark did not report metrics" : undefined,
+        })}`,
+      )
+      if (missing && testInfo.status === testInfo.expectedStatus)
+        throw new Error(`Benchmark did not report metrics: ${benchmarkName(testInfo)}`)
+    },
+    { auto: true },
+  ],
+  page: async ({ page }, use, testInfo) => {
+    const name = benchmarkName(testInfo)
+    const diagnostics = await observePerformancePage(page, name)
+    try {
+      await use(page)
+    } finally {
+      try {
+        await reportPerformancePage(name, diagnostics, testInfo)
+      } finally {
+        if (testInfo.status !== testInfo.expectedStatus) {
+          await testInfo.attach("performance-navigations", {
+            body: JSON.stringify(diagnostics.navigations, null, 2),
+            contentType: "application/json",
+          })
+        }
+      }
+    }
+  },
+})
+
+function benchmarkName(testInfo: TestInfo) {
+  return testInfo.titlePath.slice(1).join(" > ")
+}
+
+export { expect }
+
+async function observePerformancePage(page: Page, name: string) {
+  const navigations: string[] = []
+  const onNavigation = (frame: ReturnType<Page["mainFrame"]>) => {
+    if (frame === page.mainFrame()) navigations.push(frame.url())
+  }
+  page.on("framenavigated", onNavigation)
+  const stopTrace = await startChromeTrace(page, name).catch((error) => {
+    page.off("framenavigated", onNavigation)
+    throw error
+  })
+  let stopping: Promise<string | undefined> | undefined
+  const diagnostics: PerformancePageDiagnostics = {
+    navigations,
+    stop() {
+      page.off("framenavigated", onNavigation)
+      return (stopping ??= stopTrace?.() ?? Promise.resolve(undefined))
+    },
+  }
+  pages.set(page, diagnostics)
+  return diagnostics
+}
+
+export async function withBenchmarkPage<T>(
+  browser: Browser,
+  name: string,
+  run: (page: Page) => Promise<T>,
+  testInfo?: TestInfo,
+) {
+  const context = await browser.newContext()
+  try {
+    const page = await context.newPage()
+    const diagnostics = await observePerformancePage(page, name)
+    try {
+      return await run(page)
+    } finally {
+      await reportPerformancePage(name, diagnostics, testInfo)
+    }
+  } finally {
+    await context.close()
+  }
+}
+
+async function reportPerformancePage(name: string, diagnostics: PerformancePageDiagnostics, testInfo?: TestInfo) {
+  const trace = await diagnostics.stop()
+  console.log(
+    `BENCHMARK_PAGE ${JSON.stringify({
+      schemaVersion: 2,
+      runID: process.env.OPENCODE_PERFORMANCE_RUN_ID,
+      name,
+      test: testInfo ? benchmarkName(testInfo) : undefined,
+      retry: testInfo?.retry,
+      repeatEachIndex: testInfo?.repeatEachIndex,
+      context: {
+        platform: process.platform,
+        trace,
+        selectorTrace: process.env.OPENCODE_PERFORMANCE_SELECTOR_TRACE === "1",
+      },
+      navigations: diagnostics.navigations,
+    })}`,
+  )
+}
+
+export function benchmarkDiagnostics(page: Page) {
+  const diagnostics = pages.get(page)
+  if (!diagnostics) throw new Error("Performance diagnostics are not installed for this page")
+  return diagnostics
+}
@@ -0,0 +1,95 @@
+import type { CDPSession, Page } from "@playwright/test"
+import path from "node:path"
+import { mkdir, open, rename } from "node:fs/promises"
+import { Buffer } from "node:buffer"
+import { createHash, randomUUID } from "node:crypto"
+
+const categories = [
+  "-*",
+  "devtools.timeline",
+  "v8.execute",
+  "disabled-by-default-devtools.timeline",
+  "disabled-by-default-devtools.timeline.frame",
+  "toplevel",
+  "blink.console",
+  "blink.user_timing",
+  "latencyInfo",
+  "disabled-by-default-devtools.timeline.stack",
+  "disabled-by-default-v8.cpu_profiler",
+]
+
+export async function startChromeTrace(page: Page, name: string) {
+  const directory = process.env.OPENCODE_PERFORMANCE_TRACE_DIR
+  if (!directory) return
+
+  const selectors = process.env.OPENCODE_PERFORMANCE_SELECTOR_TRACE === "1"
+  const file = await prepareChromeTrace(directory, name, selectors)
+  const session = await page.context().newCDPSession(page)
+  try {
+    await session.send("Tracing.start", {
+      transferMode: "ReturnAsStream",
+      traceConfig: {
+        excludedCategories: categories
+          .filter((category) => category.startsWith("-"))
+          .map((category) => category.slice(1)),
+        includedCategories: [
+          ...categories.filter((category) => !category.startsWith("-")),
+          ...(selectors
+            ? ["disabled-by-default-blink.debug", "disabled-by-default-devtools.timeline.invalidationTracking"]
+            : []),
+        ],
+      },
+    })
+  } catch (error) {
+    await Promise.allSettled([session.detach()])
+    throw error
+  }
+  let stopping: Promise<string> | undefined
+
+  return () =>
+    (stopping ??= (async () => {
+      try {
+        const complete = new Promise<{ stream?: string; dataLossOccurred: boolean }>((resolve) =>
+          session.once("Tracing.tracingComplete", resolve),
+        )
+        await session.send("Tracing.end")
+        const result = await complete
+        if (!result.stream) throw new Error(`Chrome trace stream missing: ${file}`)
+        const partial = `${file}.partial`
+        await writeProtocolStream(session, result.stream, partial)
+        if (result.dataLossOccurred) throw new Error(`Chrome trace lost data; partial capture retained: ${partial}`)
+        await rename(partial, file)
+        return file
+      } finally {
+        await Promise.allSettled([session.detach()])
+      }
+    })())
+}
+
+export async function prepareChromeTrace(
+  directory: string,
+  name: string,
+  selectors: boolean,
+  nonce = randomUUID().slice(0, 8),
+) {
+  await mkdir(directory, { recursive: true })
+  const run = process.env.OPENCODE_PERFORMANCE_RUN_ID ?? "manual"
+  const hash = createHash("sha256").update(name).digest("hex").slice(0, 8)
+  return path.join(
+    directory,
+    `${run}-${name.replace(/[^a-zA-Z0-9_-]/g, "-")}-${hash}-${nonce}${selectors ? "-selectors" : ""}.json`,
+  )
+}
+
+async function writeProtocolStream(session: CDPSession, handle: string, file: string) {
+  const output = await open(file, "wx")
+  try {
+    while (true) {
+      const chunk = await session.send("IO.read", { handle })
+      await output.write(chunk.base64Encoded ? Buffer.from(chunk.data, "base64") : chunk.data)
+      if (chunk.eof) break
+    }
+  } finally {
+    await Promise.allSettled([output.close(), session.send("IO.close", { handle })])
+  }
+}
@@ -0,0 +1,20 @@
+import config from "../../playwright.config"
+
+const port = Number(process.env.PLAYWRIGHT_PORT ?? 3000)
+process.env.PLAYWRIGHT_SERVER_PORT = String(port)
+process.env.OPENCODE_PERFORMANCE_RUN_ID ??= `${new Date().toISOString().replace(/[:.]/g, "-")}-${process.pid}`
+
+export default {
+  ...config,
+  testDir: ".",
+  testIgnore: "unit/**",
+  outputDir: "../test-results/performance",
+  fullyParallel: false,
+  workers: 1,
+  reporter: [["html", { outputFolder: "../playwright-report/performance", open: "never" }], ["line"]],
+  webServer: {
+    ...config.webServer,
+    command: `bun run build && bun run serve -- --host 0.0.0.0 --port ${port} --strictPort`,
+    reuseExistingServer: false,
+  },
+}
@@ -0,0 +1,13 @@
+import config from "./playwright.config"
+
+export default {
+  ...config,
+  outputDir: "../test-results/performance-uncapped",
+  reporter: [["html", { outputFolder: "../playwright-report/performance-uncapped", open: "never" }], ["line"]],
+  use: {
+    ...config.use,
+    launchOptions: {
+      args: ["--disable-frame-rate-limit", "--disable-gpu-vsync"],
+    },
+  },
+}
@@ -0,0 +1,49 @@
+import { benchmark, expect } from "../benchmark"
+import { expectSessionTitle } from "../../utils/waits"
+import { fixture } from "./session-timeline-stress.fixture"
+import {
+  collectCachedRepaintTrace,
+  compressCachedRepaintTrace,
+  installCachedRepaintProbe,
+  waitForCachedRepaintWindow,
+} from "./session-tab-repaint-probe"
+import { waitForStableTimeline } from "./session-tab-switch-probe"
+import {
+  installStressSessionTabs,
+  installTimelineSettings,
+  mockStressTimeline,
+  stressSessionHref,
+} from "./timeline-test-helpers"
+
+benchmark("samples cached session repaint after the click", async ({ page, report }) => {
+  benchmark.setTimeout(120_000)
+  await mockStressTimeline(page)
+  await installStressSessionTabs(page)
+  await installTimelineSettings(page)
+  await page.goto(stressSessionHref(fixture.targetID))
+  await expectSessionTitle(page, fixture.expected.targetTitle)
+  await waitForStableTimeline(page, fixture.expected.targetMessageIDs.at(-1)!)
+  await page
+    .locator(`[data-slot="titlebar-tabs"] a[href="${stressSessionHref(fixture.sourceID)}"]`)
+    .first()
+    .click()
+  await expectSessionTitle(page, fixture.expected.sourceTitle)
+  await waitForStableTimeline(page, fixture.expected.sourceMessageIDs.at(-1)!)
+
+  await installCachedRepaintProbe(page, {
+    targetHref: stressSessionHref(fixture.targetID),
+    destination: fixture.messages[fixture.targetID].map((message) => message.info.id),
+    source: fixture.messages[fixture.sourceID].map((message) => message.info.id),
+    last: fixture.expected.targetMessageIDs.at(-1)!,
+    windowMs: 1_000,
+  })
+
+  await page
+    .locator(`[data-slot="titlebar-tabs"] a[href="${stressSessionHref(fixture.targetID)}"]`)
+    .first()
+    .click()
+  await Promise.all([expectSessionTitle(page, fixture.expected.targetTitle), waitForCachedRepaintWindow(page, 1_000)])
+  const result = await collectCachedRepaintTrace(page)
+  report(compressCachedRepaintTrace(result))
+  expect(result.samples.length).toBeGreaterThan(0)
+})
@@ -0,0 +1,251 @@
+import type { Page } from "@playwright/test"
+
+type CachedRepaintTrace = {
+  timeOriginEpochMs: number
+  startedAtPerformanceMs: number
+  samples: {
+    observedAtMs: number
+    root: number | undefined
+    scrollTop: number
+    scrollHeight: number
+    bottomErrorPx: number | undefined
+    last: boolean
+    rows: { key: string | undefined; node: number; top: number; bottom: number }[]
+    mounted: number
+    center: string | undefined
+    destination: string[]
+    source: string[]
+  }[]
+  mutations: { observedAtMs: number; changed: { type: string; node: number }[] }[]
+  shifts: { occurredAtMs: number; value: number }[]
+  windowMs: number
+  running: boolean
+  stop: () => void
+}
+
+export async function installCachedRepaintProbe(
+  page: Page,
+  input: { targetHref: string; destination: string[]; source: string[]; last: string; windowMs: number },
+) {
+  await page.evaluate(({ targetHref, destination, source, last, windowMs }) => {
+    const destinationIDs = new Set(destination)
+    const sourceIDs = new Set(source)
+    const nodeIDs = new WeakMap<Node, number>()
+    let nextNodeID = 1
+    const id = (node: Node) => {
+      const current = nodeIDs.get(node)
+      if (current) return current
+      nodeIDs.set(node, nextNodeID)
+      return nextNodeID++
+    }
+    const state: CachedRepaintTrace = {
+      timeOriginEpochMs: performance.timeOrigin,
+      startedAtPerformanceMs: 0,
+      samples: [],
+      mutations: [],
+      shifts: [],
+      windowMs,
+      running: false,
+      stop: () => {},
+    }
+    const recordShifts = (entries: PerformanceEntry[]) => {
+      if (!state.running) return
+      state.shifts.push(
+        ...entries
+          .map((entry) => {
+            if (
+              entry.startTime < state.startedAtPerformanceMs ||
+              entry.startTime > state.startedAtPerformanceMs + state.windowMs
+            )
+              return
+            return {
+              occurredAtMs: entry.startTime - state.startedAtPerformanceMs,
+              value: (entry as PerformanceEntry & { value: number }).value,
+            }
+          })
+          .filter((entry): entry is { occurredAtMs: number; value: number } => entry !== undefined),
+      )
+    }
+    const shiftObserver = new PerformanceObserver((entries) => recordShifts(entries.getEntries()))
+    shiftObserver.observe({ type: "layout-shift" })
+    const recordMutations = (entries: MutationRecord[]) => {
+      if (!state.running) return
+      const observedAtMs = performance.now() - state.startedAtPerformanceMs
+      if (observedAtMs > state.windowMs) return
+      const changed = entries.flatMap((entry) => [
+        ...[...entry.addedNodes].map((node) => ({ type: "add", node: id(node) })),
+        ...[...entry.removedNodes].map((node) => ({ type: "remove", node: id(node) })),
+      ])
+      if (changed.length) state.mutations.push({ observedAtMs, changed })
+    }
+    const mutationObserver = new MutationObserver(recordMutations)
+    mutationObserver.observe(document.documentElement, { childList: true, subtree: true })
+    state.stop = () => {
+      recordShifts(shiftObserver.takeRecords())
+      recordMutations(mutationObserver.takeRecords())
+      state.running = false
+      shiftObserver.disconnect()
+      mutationObserver.disconnect()
+    }
+    const sample = () => {
+      if (!state.running) return
+      setTimeout(() => {
+        if (!state.running) return
+        const observedAtMs = performance.now() - state.startedAtPerformanceMs
+        if (observedAtMs > state.windowMs) return
+        const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
+          element.querySelector("[data-timeline-row]"),
+        )
+        if (root) {
+          const view = root.getBoundingClientRect()
+          const rows = [...root.querySelectorAll<HTMLElement>("[data-timeline-key]")]
+            .map((element) => ({
+              key: element.dataset.timelineKey,
+              node: id(element),
+              rect: element.getBoundingClientRect(),
+            }))
+            .filter((item) => item.rect.bottom > view.top && item.rect.top < view.bottom)
+            .map((item) => ({
+              key: item.key,
+              node: item.node,
+              top: item.rect.top - view.top,
+              bottom: item.rect.bottom - view.top,
+            }))
+          const messages = [...root.querySelectorAll<HTMLElement>("[data-message-id]")]
+            .filter((element) => {
+              const rect = element.getBoundingClientRect()
+              return rect.bottom > view.top && rect.top < view.bottom
+            })
+            .map((element) => element.dataset.messageId!)
+          const spacer = root.querySelector<HTMLElement>('[data-timeline-row="bottom-spacer"]')?.getBoundingClientRect()
+          state.samples.push({
+            observedAtMs,
+            root: id(root),
+            scrollTop: root.scrollTop,
+            scrollHeight: root.scrollHeight,
+            bottomErrorPx: spacer ? spacer.bottom - view.bottom : undefined,
+            last: messages.includes(last),
+            rows,
+            mounted: root.querySelectorAll("[data-timeline-key]").length,
+            center: document
+              .elementFromPoint(view.left + view.width / 2, view.top + view.height / 2)
+              ?.textContent?.slice(0, 80),
+            destination: messages.filter((messageID) => destinationIDs.has(messageID)),
+            source: messages.filter((messageID) => sourceIDs.has(messageID)),
+          })
+        } else {
+          state.samples.push({
+            observedAtMs,
+            root: undefined,
+            scrollTop: 0,
+            scrollHeight: 0,
+            bottomErrorPx: undefined,
+            last: false,
+            rows: [],
+            mounted: 0,
+            center: document.elementFromPoint(innerWidth / 2, innerHeight / 2)?.textContent?.slice(0, 80),
+            destination: [],
+            source: [],
+          })
+        }
+        requestAnimationFrame(sample)
+      }, 0)
+    }
+    document.addEventListener(
+      "click",
+      (event) => {
+        const link = event.target instanceof Element ? event.target.closest("a") : undefined
+        if (link?.getAttribute("href") !== targetHref) return
+        state.startedAtPerformanceMs = performance.now()
+        state.running = true
+        requestAnimationFrame(sample)
+      },
+      { capture: true, once: true },
+    )
+    ;(window as Window & { __cachedFlash?: CachedRepaintTrace }).__cachedFlash = state
+  }, input)
+}
+
+export function layoutShiftSample(entry: Pick<PerformanceEntry, "startTime"> & { value: number }, started: number) {
+  if (entry.startTime < started) return
+  return { occurredAtMs: entry.startTime - started, value: entry.value }
+}
+
+export async function waitForCachedRepaintWindow(page: Page, durationMs: number) {
+  await page.waitForFunction((durationMs) => {
+    const state = (window as Window & { __cachedFlash?: CachedRepaintTrace }).__cachedFlash
+    return !!state?.running && performance.now() - state.startedAtPerformanceMs >= durationMs
+  }, durationMs)
+}
+
+export async function collectCachedRepaintTrace(page: Page) {
+  return page.evaluate(() => {
+    const state = (window as Window & { __cachedFlash?: CachedRepaintTrace }).__cachedFlash!
+    state.stop()
+    return state
+  })
+}
+
+export function summarizeCachedRepaintTrace(trace: CachedRepaintTrace) {
+  const roots = trace.samples.map((sample) => sample.root)
+  const bottomErrors = trace.samples.flatMap((sample) =>
+    sample.bottomErrorPx === undefined ? [] : [Math.abs(sample.bottomErrorPx)],
+  )
+  const category = (sample: CachedRepaintTrace["samples"][number]) => {
+    if (sample.source.length) return "source"
+    if (sample.root === undefined || sample.rows.length === 0) return "blank"
+    if (!sample.destination.length) return "unknown"
+    if (sample.last && Math.abs(sample.bottomErrorPx ?? Infinity) <= 1) return "correct"
+    return "wrongDestination"
+  }
+  return {
+    samples: trace.samples.length,
+    durationMs: trace.samples.at(-1)?.observedAtMs ?? 0,
+    firstSampleObservedMs: trace.samples[0]?.observedAtMs,
+    firstSampleCorrect: trace.samples[0] ? category(trace.samples[0]) === "correct" : false,
+    blankSamples: trace.samples.filter((sample) => category(sample) === "blank").length,
+    sourceSamples: trace.samples.filter((sample) => category(sample) === "source").length,
+    wrongDestinationSamples: trace.samples.filter((sample) => category(sample) === "wrongDestination").length,
+    unknownSamples: trace.samples.filter((sample) => category(sample) === "unknown").length,
+    rootChanges: roots.slice(1).filter((root, index) => root !== roots[index]).length,
+    mountedMin: trace.samples.length ? Math.min(...trace.samples.map((sample) => sample.mounted)) : 0,
+    mountedMax: Math.max(...trace.samples.map((sample) => sample.mounted)),
+    maxBottomErrorPx: Math.max(0, ...bottomErrors),
+    mutationBatches: trace.mutations.length,
+    addedNodes: trace.mutations.reduce(
+      (sum, batch) => sum + batch.changed.filter((change) => change.type === "add").length,
+      0,
+    ),
+    removedNodes: trace.mutations.reduce(
+      (sum, batch) => sum + batch.changed.filter((change) => change.type === "remove").length,
+      0,
+    ),
+    layoutShiftValueSum: trace.shifts.reduce((sum, shift) => sum + shift.value, 0),
+    maxLayoutShiftValue: Math.max(0, ...trace.shifts.map((shift) => shift.value)),
+  }
+}
+
+export function compressCachedRepaintTrace(trace: CachedRepaintTrace) {
+  const samples: {
+    observedAtMs: number[]
+    state: Omit<CachedRepaintTrace["samples"][number], "observedAtMs">
+  }[] = []
+  for (const sample of trace.samples) {
+    const { observedAtMs, ...state } = sample
+    const previous = samples.at(-1)
+    if (previous && JSON.stringify(previous.state) === JSON.stringify(state)) {
+      previous.observedAtMs.push(observedAtMs)
+      continue
+    }
+    samples.push({ observedAtMs: [observedAtMs], state })
+  }
+  return {
+    timeOriginEpochMs: trace.timeOriginEpochMs,
+    startedAtPerformanceMs: trace.startedAtPerformanceMs,
+    windowMs: trace.windowMs,
+    summary: summarizeCachedRepaintTrace(trace),
+    samples,
+    mutations: trace.mutations,
+    shifts: trace.shifts,
+  }
+}
@@ -0,0 +1,79 @@
+import type { Page } from "@playwright/test"
+import { expectSessionTitle } from "../../utils/waits"
+import { benchmark, expect, withBenchmarkPage } from "../benchmark"
+import { fixture } from "./session-timeline-stress.fixture"
+import { installStressSessionTabs, mockStressTimeline, stressSessionHref } from "./timeline-test-helpers"
+import { measureSessionSwitch, waitForStableTimeline } from "./session-tab-switch-probe"
+
+type Result = Awaited<ReturnType<typeof measureSessionSwitch>>
+
+benchmark("benchmarks cold and hot session tab switching", async ({ browser, report }, testInfo) => {
+  benchmark.setTimeout(180_000)
+  const results = { cold: [] as Result[], hot: [] as Result[] }
+  for (const mode of ["cold", "hot"] as const) {
+    for (let run = 0; run < 5; run++) {
+      results[mode].push(
+        await withBenchmarkPage(browser, `session-tab-switch-${mode}-${run}`, (page) => trial(page, mode), testInfo),
+      )
+    }
+  }
+  report({ results, summary: summarize(results) })
+})
+
+async function trial(page: Page, mode: "cold" | "hot") {
+  await mockStressTimeline(page)
+  await installStressSessionTabs(page)
+  if (mode === "hot") {
+    await page.goto(stressSessionHref(fixture.targetID))
+    await expectSessionTitle(page, fixture.expected.targetTitle)
+    await waitForStableTimeline(page, fixture.expected.targetMessageIDs.at(-1)!)
+    await switchSession(page, fixture.sourceID, fixture.expected.sourceTitle)
+  } else {
+    await page.goto(stressSessionHref(fixture.sourceID))
+    await expectSessionTitle(page, fixture.expected.sourceTitle)
+  }
+  await waitForStableTimeline(page, fixture.expected.sourceMessageIDs.at(-1)!)
+
+  const destinationIDs = fixture.messages[fixture.targetID].map((message) => message.info.id)
+  const sourceIDs = fixture.messages[fixture.sourceID].map((message) => message.info.id)
+  const lastID = fixture.expected.targetMessageIDs.at(-1)!
+  const href = stressSessionHref(fixture.targetID)
+  const result = await measureSessionSwitch(page, {
+    destinationIDs,
+    sourceIDs,
+    lastID,
+    href,
+    switch: () => switchSession(page, fixture.targetID, fixture.expected.targetTitle),
+  })
+  return result
+}
+
+function summarize(results: Record<"cold" | "hot", Result[]>) {
+  const stats = (values: (number | null)[]) => {
+    const sorted = values.filter((value): value is number => value !== null).sort((a, b) => a - b)
+    return {
+      min: sorted[0] ?? null,
+      median: sorted[Math.floor(sorted.length / 2)] ?? null,
+      max: sorted.at(-1) ?? null,
+      missing: values.length - sorted.length,
+    }
+  }
+  return Object.fromEntries(
+    Object.entries(results).map(([mode, values]) => [
+      mode,
+      {
+        firstDestinationObservedMs: stats(values.map((value) => value.firstDestinationObservedMs)),
+        firstCorrectObservedMs: stats(values.map((value) => value.firstCorrectObservedMs)),
+        stableObservedMs: stats(values.map((value) => value.stableObservedMs)),
+      },
+    ]),
+  )
+}
+
+async function switchSession(page: Page, sessionID: string, title: string) {
+  const href = stressSessionHref(sessionID)
+  const tab = page.locator(`[data-slot="titlebar-tabs"] a[href="${href}"]`).first()
+  await expect(tab).toBeVisible()
+  await tab.click()
+  await expectSessionTitle(page, title)
+}
@@ -0,0 +1,46 @@
+export type SessionSwitchSample = {
+  observedAtMs: number
+  destination: string[]
+  source: string[]
+  hasVisibleRows: boolean
+  last: boolean
+  bottomErrorPx?: number
+}
+
+export function classifySessionSwitch(samples: SessionSwitchSample[]) {
+  const firstDestination = samples.findIndex((sample) => sample.destination.length > 0)
+  const firstCorrect = samples.findIndex(isCorrectDestination)
+  const stable = samples.findIndex((_, index) => isStableSessionSwitch(samples.slice(index, index + 3)))
+  return {
+    firstDestinationObservedMs: samples[firstDestination]?.observedAtMs ?? null,
+    firstCorrectObservedMs: samples[firstCorrect]?.observedAtMs ?? null,
+    stableObservedMs: samples[stable + 2]?.observedAtMs ?? null,
+    wrongDestinationSamples: samples
+      .slice(firstDestination)
+      .filter((sample) => sample.destination.length > 0 && !sample.last).length,
+    blankSamples: samples.filter((sample) => !sample.hasVisibleRows).length,
+    unknownSamples: samples.filter(
+      (sample) => sample.hasVisibleRows && sample.destination.length === 0 && sample.source.length === 0,
+    ).length,
+    sourceSamples: samples.filter((sample) => sample.source.length > 0).length,
+  }
+}
+
+export function isCorrectDestination(sample: SessionSwitchSample) {
+  return (
+    sample.destination.length > 0 &&
+    sample.source.length === 0 &&
+    sample.last &&
+    Math.abs(sample.bottomErrorPx ?? Infinity) <= 1
+  )
+}
+
+export function isStableSessionSwitch(samples: SessionSwitchSample[]) {
+  return samples.length === 3 && samples.every(isCorrectDestination)
+}
+
+export function isStableDestination(samples: Pick<SessionSwitchSample, "last" | "bottomErrorPx">[]) {
+  return (
+    samples.length === 3 && samples.every((sample) => sample.last && Math.abs(sample.bottomErrorPx ?? Infinity) <= 1)
+  )
+}
@@ -0,0 +1,152 @@
+import { expect, type Page } from "@playwright/test"
+import { classifySessionSwitch, isStableDestination, type SessionSwitchSample } from "./session-tab-switch-metrics"
+
+type SessionSwitchProbe = {
+  samples: SessionSwitchSample[]
+  stop: () => void
+}
+
+async function installSessionSwitchProbe(
+  page: Page,
+  input: { destinationIDs: string[]; sourceIDs: string[]; lastID: string; href: string },
+) {
+  await page.evaluate(({ destinationIDs, sourceIDs, lastID, href }) => {
+    const destination = new Set(destinationIDs)
+    const source = new Set(sourceIDs)
+    const samples: SessionSwitchSample[] = []
+    let started: number | undefined
+    let running = true
+    const sample = () => {
+      if (!running || started === undefined) return
+      setTimeout(() => {
+        if (!running || started === undefined) return
+        const observedAtMs = performance.now() - started
+        const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
+          element.querySelector("[data-timeline-row]"),
+        )
+        if (root) {
+          const view = root.getBoundingClientRect()
+          const visible = [...root.querySelectorAll<HTMLElement>("[data-message-id]")]
+            .filter((element) => {
+              const rect = element.getBoundingClientRect()
+              return rect.bottom > view.top && rect.top < view.bottom
+            })
+            .map((element) => element.dataset.messageId!)
+          const hasVisibleRows = [...root.querySelectorAll<HTMLElement>("[data-timeline-key]")].some((element) => {
+            const rect = element.getBoundingClientRect()
+            return rect.bottom > view.top && rect.top < view.bottom
+          })
+          const spacer = root.querySelector<HTMLElement>('[data-timeline-row="bottom-spacer"]')?.getBoundingClientRect()
+          samples.push({
+            observedAtMs,
+            destination: visible.filter((id) => destination.has(id)),
+            source: visible.filter((id) => source.has(id)),
+            hasVisibleRows,
+            last: visible.includes(lastID),
+            bottomErrorPx: spacer ? spacer.bottom - view.bottom : undefined,
+          })
+        } else {
+          samples.push({ observedAtMs, destination: [], source: [], hasVisibleRows: false, last: false })
+        }
+        requestAnimationFrame(sample)
+      }, 0)
+    }
+    document.addEventListener(
+      "click",
+      (event) => {
+        const link = event.target instanceof Element ? event.target.closest("a") : undefined
+        if (link?.getAttribute("href") !== href) return
+        started = performance.now()
+        requestAnimationFrame(sample)
+      },
+      { capture: true, once: true },
+    )
+    ;(window as Window & { __sessionSwitchProbe?: SessionSwitchProbe }).__sessionSwitchProbe = {
+      samples,
+      stop: () => {
+        running = false
+      },
+    }
+  }, input)
+}
+
+async function waitForStableSessionSwitch(page: Page) {
+  await page.waitForFunction(() => {
+    const samples = (window as Window & { __sessionSwitchProbe?: SessionSwitchProbe }).__sessionSwitchProbe?.samples
+    if (!samples) return false
+    return samples.some((_, index) => {
+      const stable = samples.slice(index, index + 3)
+      return (
+        stable.length === 3 &&
+        stable.every(
+          (sample) =>
+            sample.destination.length > 0 &&
+            sample.source.length === 0 &&
+            sample.last &&
+            Math.abs(sample.bottomErrorPx ?? Infinity) <= 1,
+        )
+      )
+    })
+  })
+}
+
+async function collectSessionSwitchResult(page: Page) {
+  const samples = await page.evaluate(() => {
+    const probe = (window as Window & { __sessionSwitchProbe?: SessionSwitchProbe }).__sessionSwitchProbe!
+    probe.stop()
+    return probe.samples
+  })
+  return classifySessionSwitch(samples)
+}
+
+export async function measureSessionSwitch(
+  page: Page,
+  input: { destinationIDs: string[]; sourceIDs: string[]; lastID: string; href: string; switch: () => Promise<void> },
+) {
+  const { switch: run, ...probe } = input
+  await installSessionSwitchProbe(page, probe)
+  await run()
+  await waitForStableSessionSwitch(page)
+  return collectSessionSwitchResult(page)
+}
+
+export async function waitForStableTimeline(page: Page, lastID: string) {
+  const samples: Pick<SessionSwitchSample, "last" | "bottomErrorPx">[] = []
+  await expect
+    .poll(
+      async () => {
+        samples.push(
+          await page.evaluate(
+            (lastID) =>
+              new Promise<Pick<SessionSwitchSample, "last" | "bottomErrorPx">>((resolve) => {
+                requestAnimationFrame(() =>
+                  setTimeout(() => {
+                    const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
+                      element.querySelector("[data-timeline-row]"),
+                    )
+                    if (!root) {
+                      resolve({ last: false })
+                      return
+                    }
+                    const view = root.getBoundingClientRect()
+                    const last = [...root.querySelectorAll<HTMLElement>("[data-message-id]")].some((element) => {
+                      if (element.dataset.messageId !== lastID) return false
+                      const rect = element.getBoundingClientRect()
+                      return rect.bottom > view.top && rect.top < view.bottom
+                    })
+                    const spacer = root
+                      .querySelector<HTMLElement>('[data-timeline-row="bottom-spacer"]')
+                      ?.getBoundingClientRect()
+                    resolve({ last, bottomErrorPx: spacer ? spacer.bottom - view.bottom : undefined })
+                  }, 0),
+                )
+              }),
+            lastID,
+          ),
+        )
+        return isStableDestination(samples.slice(-3))
+      },
+      { timeout: 30_000, intervals: [0] },
+    )
+    .toBe(true)
+}
@@ -0,0 +1,488 @@
+import { base64Encode } from "@opencode-ai/core/util/encode"
+import type { Page } from "@playwright/test"
+import { mockOpenCodeServer } from "../../utils/mock-server"
+import { expectAppVisible, expectSessionTitle } from "../../utils/waits"
+import { expect } from "../benchmark"
+
+const directory = "C:/OpenCode/TimelineStateRegression"
+const projectID = "proj_timeline_state_regression"
+const sessionID = "ses_timeline_state_regression"
+const userMessageID = "msg_user_regression"
+const assistantMessageID = "msg_assistant_regression"
+const editPartID = "prt_0001_edit"
+export const textPartID = "prt_9999_text"
+const title = "Timeline collapse state regression"
+const model = { providerID: "opencode", modelID: "claude-opus-4-6", variant: "max" }
+
+type EventPayload = {
+  directory: string
+  payload: Record<string, unknown>
+}
+
+const userMessage = {
+  info: {
+    id: userMessageID,
+    sessionID,
+    role: "user",
+    time: { created: 1700000000000 },
+    summary: { diffs: [] },
+    agent: "build",
+    model,
+  },
+  parts: [
+    {
+      id: "prt_user_text",
+      sessionID,
+      messageID: userMessageID,
+      type: "text",
+      text: "Please edit the file.",
+    },
+  ],
+}
+
+const editPart = {
+  id: editPartID,
+  sessionID,
+  messageID: assistantMessageID,
+  type: "tool",
+  callID: "call_edit_regression",
+  tool: "edit",
+  state: {
+    status: "completed",
+    input: { filePath: "src/regression.ts" },
+    output: "Edited src/regression.ts",
+    title: "src/regression.ts",
+    metadata: {
+      filediff: {
+        file: "src/regression.ts",
+        additions: 1,
+        deletions: 1,
+        before: "export const value = 'before'\n",
+        after: "export const value = 'after'\n",
+      },
+      diff: "diff --git a/src/regression.ts b/src/regression.ts\n-export const value = 'before'\n+export const value = 'after'\n",
+    },
+    time: { start: 1700000001000, end: 1700000002000 },
+  },
+}
+
+const streamedTextPart = {
+  id: textPartID,
+  sessionID,
+  messageID: assistantMessageID,
+  type: "text",
+  text: "Streaming added a later assistant text part.",
+}
+
+const assistantMessage = {
+  info: {
+    id: assistantMessageID,
+    sessionID,
+    role: "assistant",
+    time: { created: 1700000001000 },
+    parentID: userMessageID,
+    modelID: model.modelID,
+    providerID: model.providerID,
+    mode: "build",
+    agent: "build",
+    path: { cwd: directory, root: directory },
+    cost: 0.01,
+    tokens: { input: 100, output: 200, reasoning: 0, cache: { read: 0, write: 0 } },
+    variant: "max",
+  },
+  parts: [editPart],
+}
+
+export async function setupTimelineBenchmark(page: Page, options: { historyTurns: number; eventBatch: number }) {
+  const events: EventPayload[] = []
+  let eventBatch = options.eventBatch
+  await mockOpenCodeServer(page, {
+    directory,
+    project: project(),
+    provider: provider(),
+    sessions: [session()],
+    pageMessages: () => ({
+      items: [
+        ...Array.from({ length: options.historyTurns }, (_, index) => performanceTurn(index)).flat(),
+        userMessage,
+        assistantMessage,
+      ],
+    }),
+    events: () => events.splice(0, eventBatch),
+    eventRetry: 16,
+  })
+  await page.addInitScript(() => {
+    localStorage.setItem(
+      "settings.v3",
+      JSON.stringify({
+        general: {
+          editToolPartsExpanded: true,
+          shellToolPartsExpanded: true,
+          showReasoningSummaries: true,
+          showSessionProgressBar: true,
+        },
+      }),
+    )
+  })
+  await page.setViewportSize({ width: 1366, height: 768 })
+  const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
+  const text = page.locator(`[data-timeline-part-id="${textPartID}"]`).first()
+  await page.goto(`/${base64Encode(directory)}/session/${sessionID}`)
+  await expectSessionTitle(page, title)
+  await expectAppVisible(scroller)
+  return {
+    scroller,
+    text,
+    transport: {
+      enqueue(payload: EventPayload | EventPayload[]) {
+        events.push(...(Array.isArray(payload) ? payload : [payload]))
+      },
+      pendingCount() {
+        return events.length
+      },
+      releaseAll() {
+        eventBatch = events.length
+      },
+    },
+    async scrollToBottom() {
+      await scroller.evaluate((element) => {
+        element.scrollTop = element.scrollHeight
+      })
+    },
+    async waitForStableGeometry() {
+      await expect
+        .poll(() => scroller.evaluate((element) => element.scrollHeight - element.clientHeight - element.scrollTop))
+        .toBeLessThanOrEqual(1)
+      await page.waitForFunction((partID) => {
+        const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
+          element.querySelector(`[data-timeline-part-id="${partID}"]`),
+        )
+        if (!root) return false
+        return new Promise<boolean>((resolve) => {
+          const height = root.scrollHeight
+          requestAnimationFrame(() =>
+            requestAnimationFrame(() =>
+              resolve(root.scrollHeight === height && root.scrollHeight - root.clientHeight - root.scrollTop <= 1),
+            ),
+          )
+        })
+      }, textPartID)
+    },
+  }
+}
+
+export function buildInitialStreamEvent(deltaCount: number): EventPayload {
+  return {
+    directory,
+    payload: {
+      type: "message.part.updated",
+      properties: {
+        part: {
+          ...streamedTextPart,
+          text: `Streaming${streamChunk(0, deltaCount + 1)}\n\n\`\`\`ts\nconst initial = true\n\`\`\``,
+        },
+      },
+    },
+  }
+}
+
+export function buildStreamDeltaEvents(deltaCount: number): EventPayload[] {
+  return Array.from({ length: deltaCount }, (_, index) => ({
+    directory,
+    payload: {
+      type: "message.part.delta",
+      properties: {
+        messageID: assistantMessageID,
+        partID: textPartID,
+        field: "text",
+        delta: streamChunk(index + 1, deltaCount + 1),
+      },
+    },
+  }))
+}
+
+function performanceTurn(index: number) {
+  const suffix = String(index).padStart(4, "0")
+  const userID = `msg_0000_${suffix}_a_user`
+  const assistantID = `msg_0000_${suffix}_b_assistant`
+  const before = historicalSource(index, false)
+  const after = historicalSource(index, true)
+  const parts = [
+    ...(index % 5 === 0
+      ? [
+          {
+            id: `prt_0000_${suffix}_reasoning`,
+            sessionID,
+            messageID: assistantID,
+            type: "reasoning",
+            text: `Reviewing the existing implementation. ${"constraint analysis ".repeat(20)}`,
+            time: { start: 1690000001000 + index * 2_000, end: 1690000001200 + index * 2_000 },
+          },
+        ]
+      : []),
+    {
+      id: `prt_0000_${suffix}_assistant`,
+      sessionID,
+      messageID: assistantID,
+      type: "text",
+      text: historicalMarkdown(index),
+    },
+    ...(index % 8 === 0
+      ? [
+          {
+            id: `prt_0000_${suffix}_edit`,
+            sessionID,
+            messageID: assistantID,
+            type: "tool",
+            callID: `call_0000_${suffix}_edit`,
+            tool: "edit",
+            state: {
+              status: "completed",
+              input: { filePath: `src/history-${index}.ts` },
+              output: `Edited src/history-${index}.ts`,
+              title: `src/history-${index}.ts`,
+              metadata: {
+                filediff: { file: `src/history-${index}.ts`, additions: 48, deletions: 48, before, after },
+              },
+              time: { start: 1690000001200 + index * 2_000, end: 1690000001400 + index * 2_000 },
+            },
+          },
+        ]
+      : []),
+    ...(index % 12 === 0
+      ? [
+          {
+            id: `prt_0000_${suffix}_write`,
+            sessionID,
+            messageID: assistantID,
+            type: "tool",
+            callID: `call_0000_${suffix}_write`,
+            tool: "write",
+            state: {
+              status: "completed",
+              input: { filePath: `src/generated-${index}.tsx`, content: after },
+              output: `Wrote src/generated-${index}.tsx`,
+              title: `src/generated-${index}.tsx`,
+              metadata: {
+                filediff: { file: `src/generated-${index}.tsx`, additions: 32, deletions: 0, before: "", after },
+              },
+              time: { start: 1690000001400 + index * 2_000, end: 1690000001500 + index * 2_000 },
+            },
+          },
+        ]
+      : []),
+    ...(index % 16 === 0
+      ? [
+          {
+            id: `prt_0000_${suffix}_patch`,
+            sessionID,
+            messageID: assistantID,
+            type: "tool",
+            callID: `call_0000_${suffix}_patch`,
+            tool: "apply_patch",
+            state: {
+              status: "completed",
+              input: { patchText: realisticPatch(index) },
+              output: "Success. Updated src/components/SessionCard.tsx",
+              title: "src/components/SessionCard.tsx",
+              metadata: {
+                files: [
+                  {
+                    filePath: "src/components/SessionCard.tsx",
+                    relativePath: "src/components/SessionCard.tsx",
+                    type: "update",
+                    additions: 8,
+                    deletions: 3,
+                    patch: realisticPatch(index),
+                    before,
+                    after,
+                  },
+                ],
+              },
+              time: { start: 1690000001500 + index * 2_000, end: 1690000001700 + index * 2_000 },
+            },
+          },
+        ]
+      : []),
+  ]
+  return [
+    {
+      info: {
+        id: userID,
+        sessionID,
+        role: "user",
+        time: { created: 1690000000000 + index * 2_000 },
+        summary: { diffs: [] },
+        agent: "build",
+        model,
+      },
+      parts: [
+        {
+          id: `prt_0000_${suffix}_user`,
+          sessionID,
+          messageID: userID,
+          type: "text",
+          text: `Historical prompt ${index}`,
+        },
+      ],
+    },
+    {
+      info: {
+        id: assistantID,
+        sessionID,
+        role: "assistant",
+        time: { created: 1690000001000 + index * 2_000, completed: 1690000001500 + index * 2_000 },
+        parentID: userID,
+        modelID: model.modelID,
+        providerID: model.providerID,
+        mode: "build",
+        agent: "build",
+        path: { cwd: directory, root: directory },
+        cost: 0.01,
+        tokens: { input: 100, output: 200, reasoning: 0, cache: { read: 0, write: 0 } },
+        variant: "max",
+        finish: "stop",
+      },
+      parts,
+    },
+  ]
+}
+
+function historicalMarkdown(index: number) {
+  const code = `import { For, Show, createSignal } from "solid-js"
+
+type SessionRow = { id: string; title: string; active: boolean }
+
+export function SessionList(props: { rows: SessionRow[] }) {
+  const [selected, setSelected] = createSignal<string>()
+  return (
+    <section aria-label="Sessions">
+      <For each={props.rows}>{(row) => (
+        <button classList={{ active: row.active }} onClick={() => setSelected(row.id)}>
+          <Show when={selected() === row.id} fallback={row.title}>{row.title.toUpperCase()}</Show>
+        </button>
+      )}</For>
+    </section>
+  )
+}`
+  return `## Session renderer review ${index}
+
+The active session keeps **semantic row identity** while reconciling measured content. See [Solid documentation](https://docs.solidjs.com/) and the inline \`measureElement(node)\` call.
+
+| Concern | Current behavior | Verification |
+| --- | --- | --- |
+| streaming | appends Markdown blocks | painted frames |
+| geometry | anchors visible rows | DOM coordinates |
+| tools | preserves expanded state | keyed remount probe |
+
+> Long sessions combine Markdown, syntax highlighting, tool output, and asynchronously rendered diffs.
+
+${index % 4 === 0 ? `\`\`\`tsx\n${code}\n\`\`\`\n\n\`\`\`bash\nbun typecheck\nbun test --preload ./happydom.ts ./src/pages/session\ngit diff --check\n\`\`\`` : "- preserve the viewport anchor\n- avoid replacing stable Markdown nodes\n- process provider deltas without blocking input"}`
+}
+
+function historicalSource(index: number, updated: boolean) {
+  const method = updated ? "toLocaleUpperCase(props.locale)" : "toUpperCase()"
+  const limit = updated ? 24 : 20
+  return `import { createMemo, For } from "solid-js"
+
+type Message = {
+  id: string
+  role: "user" | "assistant"
+  text: string
+  tokens: { input: number; output: number }
+}
+
+export function MessageSummary(props: { messages: Message[]; locale: string }) {
+  const visible = createMemo(() => props.messages.filter((message) => message.text.trim()).slice(-${limit}))
+  const total = createMemo(() => visible().reduce((sum, message) => sum + message.tokens.output, 0))
+  return (
+    <article data-session-index="${index}">
+      <header>{total().toLocaleString(props.locale)} output tokens</header>
+      <For each={visible()}>{(message) => <p data-role={message.role}>{message.text.${method}}</p>}</For>
+    </article>
+  )
+}
+`
+}
+
+function realisticPatch(index: number) {
+  return `*** Begin Patch
+*** Update File: src/components/SessionCard.tsx
+@@
+-const title = props.session.title.toUpperCase()
+-const messages = props.messages.slice(-20)
+const title = props.session.title.toLocaleUpperCase(props.locale)
+const messages = props.messages.filter((message) => message.text.trim()).slice(-24)
+const outputTokens = messages.reduce((sum, message) => sum + message.tokens.output, 0)
+@@
+-  <h2>{title}</h2>
+  <h2 data-session-index="${index}">{title}</h2>
+  <span>{outputTokens.toLocaleString(props.locale)} output tokens</span>
+*** End Patch`
+}
+
+export function streamChunk(index: number, count: number) {
+  if (index === 0) return `\n\n## Implementation plan\n\nStreaming **bold analysis`
+  if (index === count - 1)
+    return `\n\`\`\`\n\n## Verification\n\n- **Typecheck:** passed\n- **Timeline geometry:** stable\n- **Streaming output:** benchmark-complete <!-- stream-${index} -->`
+
+  const section = Math.floor(index / 18) + 1
+  const fragments = [
+    ` continues across three`,
+    ` or four word`,
+    ` provider deltas and`,
+    ` closes in this fragment**. <!-- stream-${index} -->\n\n`,
+    `| Concern | State`,
+    ` | Verification |\n|`,
+    ` --- | ---`,
+    ` | --- |\n|`,
+    ` markdown | incremental |`,
+    ` painted frames | <!-- stream-${index} -->\n\n`,
+    `\`\`\`tsx\nconst row: SessionRow`,
+    ` = rows[index] ??`,
+    ` fallback\nconst title =`,
+    ` row.title.toLocaleUpperCase(locale)\n`,
+    `const selected = createMemo(()`,
+    ` => row.id ===`,
+    ` activeID()) // stream-${index}\n`,
+    `// stream-${index}\n\`\`\`\n\n### Iteration ${section}\n\nStreaming **bold analysis`,
+  ]
+  return fragments[(index - 1) % fragments.length]!
+}
+
+function project() {
+  return {
+    id: projectID,
+    worktree: directory,
+    vcs: "git",
+    name: "timeline-state-regression",
+    time: { created: 1700000000000, updated: 1700000000000 },
+    sandboxes: [],
+  }
+}
+
+function session() {
+  return {
+    id: sessionID,
+    slug: "timeline-state-regression",
+    projectID,
+    directory,
+    title,
+    version: "dev",
+    time: { created: 1700000000000, updated: 1700000000000 },
+  }
+}
+
+function provider() {
+  return {
+    all: [
+      {
+        id: "opencode",
+        name: "OpenCode",
+        models: { "claude-opus-4-6": { id: "claude-opus-4-6", name: "Claude Opus 4.6", limit: { context: 200_000 } } },
+      },
+    ],
+    connected: ["opencode"],
+    default: { providerID: "opencode", modelID: "claude-opus-4-6" },
+  }
+}
@@ -0,0 +1,85 @@
+import { benchmark, benchmarkDiagnostics, expect } from "../benchmark"
+import {
+  buildInitialStreamEvent,
+  buildStreamDeltaEvents,
+  setupTimelineBenchmark,
+  textPartID,
+} from "./session-timeline-benchmark.fixture"
+import { startTimelineProfile } from "./session-timeline-profile"
+import {
+  collectTimelineStreamMetrics,
+  installTimelineStreamProbe,
+  startTimelineStreamProbe,
+} from "./session-timeline-stream-probe"
+
+benchmark.describe("performance: session timeline streaming", () => {
+  benchmark("streams assistant text without remounting or oscillating", async ({ page, report }) => {
+    benchmark.setTimeout(480_000)
+    const cpuThrottle = Number(process.env.TIMELINE_CPU_THROTTLE ?? 30)
+    const deltaCount = Number(process.env.TIMELINE_DELTA_COUNT ?? 160)
+    const historyTurns = Number(process.env.TIMELINE_HISTORY_TURNS ?? 320)
+    const eventBatch = Number(process.env.TIMELINE_EVENT_BATCH ?? 1)
+    const minimal = process.env.TIMELINE_MINIMAL === "1"
+    const profileCPU = process.env.TIMELINE_CPU_PROFILE === "1"
+    const profileVisual = !minimal && profileCPU && process.env.TIMELINE_VISUAL_PROFILE !== "0"
+    const fixture = await setupTimelineBenchmark(page, {
+      historyTurns,
+      eventBatch,
+    })
+
+    fixture.transport.enqueue(buildInitialStreamEvent(deltaCount))
+    const contentStart = performance.now()
+    await expect(fixture.text).toBeVisible()
+    await expect(fixture.text).toContainText("Implementation plan")
+    const initialContentObservedMs = performance.now() - contentStart
+    await fixture.scrollToBottom()
+    await fixture.waitForStableGeometry()
+
+    const profile = await startTimelineProfile(page, { cpuThrottle, profileCPU })
+    await installTimelineStreamProbe(page, { textPartID, finalIndex: deltaCount, profileVisual, minimal })
+    const deltas = buildStreamDeltaEvents(deltaCount)
+    await startTimelineStreamProbe(page)
+    fixture.transport.enqueue(deltas)
+
+    await page.waitForFunction(
+      (finalIndex) =>
+        (
+          window as Window & {
+            __timelineStreamBenchmark?: { applied: { index: number }[] }
+          }
+        ).__timelineStreamBenchmark?.applied.some((value) => value.index === finalIndex),
+      deltaCount,
+      { timeout: 420_000 },
+    )
+    await expect(fixture.text).toContainText("benchmark-complete")
+    await expect(fixture.text).toContainText("Streaming")
+    await fixture.waitForStableGeometry()
+    const metrics = await collectTimelineStreamMetrics(page, {
+      textPartID,
+      finalIndex: deltaCount,
+      navigations: benchmarkDiagnostics(page).navigations,
+    })
+    const delivered = deltas.length - fixture.transport.pendingCount()
+    await profile.stop()
+
+    report(
+      {
+        endToEndInitialContentObservedMs: initialContentObservedMs,
+        ...metrics,
+        deliveredDeltas: delivered,
+        pendingDeltas: fixture.transport.pendingCount(),
+      },
+      {
+        cpuThrottle,
+        profileCPU,
+        profileVisual,
+        minimal,
+        queuedDeltas: deltas.length,
+        historyTurns,
+        eventBatch,
+      },
+    )
+
+    await profile.reset()
+  })
+})
@@ -0,0 +1,40 @@
+import type { CDPSession, Page } from "@playwright/test"
+
+export async function startTimelineProfile(page: Page, options: { cpuThrottle: number; profileCPU: boolean }) {
+  const cdp = await page.context().newCDPSession(page)
+  if (options.cpuThrottle > 1) await cdp.send("Emulation.setCPUThrottlingRate", { rate: options.cpuThrottle })
+  if (options.profileCPU) {
+    await cdp.send("Profiler.enable")
+    await cdp.send("Profiler.setSamplingInterval", { interval: 100 })
+    await cdp.send("Profiler.start")
+  }
+  return {
+    async stop() {
+      if (!options.profileCPU) return
+      const result = await cdp.send("Profiler.stop")
+      const self = new Map<number, number>()
+      result.profile.samples?.forEach((id, index) => {
+        const duration = (result.profile.timeDeltas?.[index] ?? 0) / 1_000
+        self.set(id, (self.get(id) ?? 0) + duration)
+      })
+      console.log(
+        "timeline cpu profile",
+        JSON.stringify(
+          result.profile.nodes
+            .map((node) => ({
+              function: node.callFrame.functionName || "(anonymous)",
+              url: node.callFrame.url,
+              line: node.callFrame.lineNumber + 1,
+              selfMs: self.get(node.id) ?? 0,
+            }))
+            .filter((node) => node.selfMs > 1)
+            .sort((a, b) => b.selfMs - a.selfMs)
+            .slice(0, 40),
+        ),
+      )
+    },
+    async reset() {
+      if (options.cpuThrottle > 1) await cdp.send("Emulation.setCPUThrottlingRate", { rate: 1 })
+    },
+  }
+}
@@ -0,0 +1,547 @@
+import type { Page } from "@playwright/test"
+
+const STREAM_MARKER_PATTERN = "stream-(\\d+)"
+const STREAM_FRAGMENT_COUNT = 18
+
+type TimelineProbeState = {
+  started: number
+  ended: number
+  profileVisual: boolean
+  minimal: boolean
+  frames: number[]
+  frameAt: number[]
+  applied: { at: number; index: number }[]
+  geometry: {
+    scrollTop: number
+    scrollHeight: number
+    clientHeight: number
+    distance: number
+    virtualHeight: number
+    headerHeight: number
+  }[]
+  blanks: number
+  longTasks: number[]
+  layoutShifts: number[]
+  visibleMounts: number
+  visibleUnmounts: number
+  visibleRows: Set<Element>
+  visibleSubtreeMounts: string[]
+  visibleSubtreeUnmounts: string[]
+  visibleSubtreeReplacements: number
+  visibleSubtreeDropouts: string[]
+  visibleSubtrees: Map<string, Element>
+  subtreeKeys: WeakMap<Element, string>
+  maxOverlap: number
+  maxGap: number
+  maxPartTopMovement: number
+  previousPartTop: number
+  slowFrames: {
+    duration: number
+    index: number
+    phase: "stream" | "boundary" | "complete" | "unknown"
+    tokenSpans: number
+    blocks: number
+    codeBlocks: number
+    height: number
+    distance: number
+  }[]
+  scroll: {
+    calls: number
+    callNoops: number
+    sameFrameCalls: number
+    assignments: number
+    assignmentNoops: number
+    lastCallFrame: number
+    frame: number
+  }
+  row: HTMLElement
+  markdown: HTMLElement
+  running: boolean
+  previous: number
+  cleanup: () => void
+  start: () => void
+}
+
+export async function installTimelineStreamProbe(
+  page: Page,
+  options: { textPartID: string; finalIndex: number; profileVisual: boolean; minimal: boolean },
+) {
+  await page.evaluate(
+    ({ textPartID, finalIndex, profileVisual, minimal, markerPattern, fragmentCount }) => {
+      const part = document.querySelector<HTMLElement>(`[data-timeline-part-id="${textPartID}"]`)
+      const row = part?.closest<HTMLElement>("[data-timeline-row]")
+      const markdown = part?.querySelector<HTMLElement>('[data-component="markdown"]')
+      const root = part?.closest<HTMLElement>(".scroll-view__viewport")
+      if (!part || !row || !markdown || !root) throw new Error("missing streaming benchmark nodes")
+      const viewport = root.getBoundingClientRect()
+      const state: TimelineProbeState = {
+        started: 0,
+        ended: Infinity,
+        profileVisual,
+        minimal,
+        frames: [],
+        frameAt: [],
+        applied: [],
+        geometry: [],
+        blanks: 0,
+        longTasks: [],
+        layoutShifts: [],
+        visibleMounts: 0,
+        visibleUnmounts: 0,
+        visibleRows: new Set(
+          [...root.querySelectorAll("[data-timeline-key]")].filter((element) => {
+            const rect = element.getBoundingClientRect()
+            return rect.bottom > viewport.top && rect.top < viewport.bottom
+          }),
+        ),
+        visibleSubtreeMounts: [],
+        visibleSubtreeUnmounts: [],
+        visibleSubtreeReplacements: 0,
+        visibleSubtreeDropouts: [],
+        visibleSubtrees: new Map<string, Element>(),
+        subtreeKeys: new WeakMap<Element, string>(),
+        maxOverlap: 0,
+        maxGap: 0,
+        maxPartTopMovement: 0,
+        previousPartTop: part.getBoundingClientRect().top,
+        slowFrames: [],
+        scroll: {
+          calls: 0,
+          callNoops: 0,
+          sameFrameCalls: 0,
+          assignments: 0,
+          assignmentNoops: 0,
+          lastCallFrame: -1,
+          frame: 0,
+        },
+        row,
+        markdown,
+        running: false,
+        previous: 0,
+        cleanup: () => {},
+        start: () => {},
+      }
+      ;(window as Window & { __timelineStreamBenchmark?: TimelineProbeState }).__timelineStreamBenchmark = state
+      const scrollTo = Element.prototype.scrollTo
+      const scrollTop = Object.getOwnPropertyDescriptor(Element.prototype, "scrollTop")!
+      if (profileVisual) {
+        Element.prototype.scrollTo = function (...args) {
+          state.scroll.calls += 1
+          const top = typeof args[0] === "object" ? args[0]?.top : args[1]
+          if (typeof top === "number") {
+            const target = Math.min(top, this.scrollHeight - this.clientHeight)
+            if (Math.abs(this.scrollTop - target) < 1) state.scroll.callNoops += 1
+          }
+          if (state.scroll.lastCallFrame === state.scroll.frame) state.scroll.sameFrameCalls += 1
+          state.scroll.lastCallFrame = state.scroll.frame
+          return scrollTo.apply(this, args)
+        }
+        Object.defineProperty(Element.prototype, "scrollTop", {
+          configurable: true,
+          get: scrollTop.get,
+          set(value) {
+            state.scroll.assignments += 1
+            if (Math.abs(this.scrollTop - value) < 1) state.scroll.assignmentNoops += 1
+            scrollTop.set!.call(this, value)
+          },
+        })
+      }
+
+      const recordLongTasks = (entries: PerformanceEntry[]) => {
+        if (!state.running) return
+        state.longTasks.push(
+          ...entries
+            .filter((entry) => entry.startTime >= state.started && entry.startTime <= state.ended)
+            .map((entry) => entry.duration),
+        )
+      }
+      const longTaskObserver = new PerformanceObserver((list) => recordLongTasks(list.getEntries()))
+      longTaskObserver.observe({ type: "longtask" })
+      const recordLayoutShifts = (entries: PerformanceEntry[]) => {
+        if (!state.running) return
+        state.layoutShifts.push(
+          ...entries
+            .map((entry) => {
+              const shift = entry as LayoutShiftEntry
+              if (shift.startTime < state.started || shift.hadRecentInput) return
+              return shift.value
+            })
+            .filter((value): value is number => value !== undefined),
+        )
+      }
+      const layoutShiftObserver = profileVisual
+        ? new PerformanceObserver((list) => recordLayoutShifts(list.getEntries()))
+        : undefined
+      layoutShiftObserver?.observe({ type: "layout-shift", buffered: true })
+
+      const visible = (element: Element) => {
+        const rect = element.getBoundingClientRect()
+        const viewport = root.getBoundingClientRect()
+        const style = getComputedStyle(element)
+        return (
+          element.isConnected &&
+          rect.width > 0 &&
+          rect.height > 0 &&
+          rect.bottom > viewport.top &&
+          rect.top < viewport.bottom &&
+          style.display !== "none" &&
+          style.visibility !== "hidden" &&
+          Number(style.opacity) > 0
+        )
+      }
+      const critical = [
+        "[data-timeline-part-id]",
+        '[data-component="edit-content"]',
+        '[data-component="apply-patch-file-diff"]',
+        '[data-component="file"]',
+        '[data-component="markdown-code"]',
+        "[data-markdown-block]",
+      ].join(",")
+      const describe = (element: Element) => {
+        const cached = state.subtreeKeys.get(element)
+        if (!element.isConnected && cached) return cached
+        const part = element.closest<HTMLElement>("[data-timeline-part-id]")?.dataset.timelinePartId ?? "unknown"
+        const block = element
+          .closest<HTMLElement>("[data-markdown-key]")
+          ?.dataset.markdownKey?.replace(/:(?:code|full|live)$/, "")
+        const component =
+          element.getAttribute("data-component") ?? element.getAttribute("data-markdown-block") ?? element.tagName
+        const key = `${part}:${block ?? "root"}:${component}`
+        state.subtreeKeys.set(element, key)
+        return key
+      }
+      const recordMutations = (records: MutationRecord[]) => {
+        if (!state.running) return
+        records.forEach((record) => {
+          record.addedNodes.forEach((node) => {
+            if (node instanceof HTMLElement && node.matches("[data-timeline-key]") && visible(node)) {
+              state.visibleMounts += 1
+              state.visibleRows.add(node)
+            }
+            if (!(node instanceof Element)) return
+            const added = [node, ...node.querySelectorAll(critical)].filter((element) => element.matches(critical))
+            added.forEach((element) => {
+              if (visible(element)) state.visibleSubtreeMounts.push(describe(element))
+            })
+          })
+          record.removedNodes.forEach((node) => {
+            if (node instanceof HTMLElement && node.matches("[data-timeline-key]") && state.visibleRows.delete(node))
+              state.visibleUnmounts += 1
+            if (!(node instanceof Element)) return
+            const removed = [node, ...node.querySelectorAll(critical)].filter((element) => element.matches(critical))
+            removed.forEach((element) => {
+              const key = describe(element)
+              if (state.visibleSubtrees.get(key) === element) state.visibleSubtreeUnmounts.push(key)
+            })
+          })
+        })
+      }
+      const mutationObserver = profileVisual ? new MutationObserver(recordMutations) : undefined
+      mutationObserver?.observe(root, { childList: true, subtree: true })
+      const currentPart = () => root.querySelector<HTMLElement>(`[data-timeline-part-id="${textPartID}"]`)
+      const observeProgress = (at: number) => {
+        if (!state.running) return
+        const content = currentPart()?.textContent ?? ""
+        const index = content.includes("benchmark-complete")
+          ? finalIndex
+          : Number(content.match(new RegExp(markerPattern, "g"))?.at(-1)?.match(/\d+/)?.[0] ?? -1)
+        if (index >= 0 && index !== state.applied.at(-1)?.index) state.applied.push({ at, index })
+      }
+      const progressObserver = new MutationObserver(() => observeProgress(performance.now()))
+      progressObserver.observe(root, { characterData: true, childList: true, subtree: true })
+      state.cleanup = () => {
+        recordLongTasks(longTaskObserver.takeRecords())
+        recordLayoutShifts(layoutShiftObserver?.takeRecords() ?? [])
+        recordMutations(mutationObserver?.takeRecords() ?? [])
+        if (progressObserver.takeRecords().length) observeProgress(performance.now())
+        longTaskObserver.disconnect()
+        layoutShiftObserver?.disconnect()
+        mutationObserver?.disconnect()
+        progressObserver.disconnect()
+        if (!profileVisual) return
+        Element.prototype.scrollTo = scrollTo
+        Object.defineProperty(Element.prototype, "scrollTop", scrollTop)
+      }
+
+      const sample = (now: number) => {
+        if (!state.running) return
+        state.frameAt.push(now)
+        observeProgress(now)
+        if (minimal) {
+          state.frames.push(now - state.previous)
+          state.previous = now
+          requestAnimationFrame(sample)
+          return
+        }
+        setTimeout(() => {
+          if (!state.running) return
+          state.scroll.frame += 1
+          const duration = now - state.previous
+          state.frames.push(duration)
+          state.previous = now
+          const virtualRoot = root.querySelector<HTMLElement>("[data-timeline-virtual-content]")
+          const header = root.querySelector<HTMLElement>("[data-session-title]")
+          state.geometry.push({
+            scrollTop: root.scrollTop,
+            scrollHeight: root.scrollHeight,
+            clientHeight: root.clientHeight,
+            distance: root.scrollHeight - root.clientHeight - root.scrollTop,
+            virtualHeight: virtualRoot?.getBoundingClientRect().height ?? 0,
+            headerHeight: header?.getBoundingClientRect().height ?? 0,
+          })
+          const viewport = root.getBoundingClientRect()
+          if (profileVisual) {
+            const visibleRows = [...root.querySelectorAll<HTMLElement>("[data-timeline-key]")]
+              .map((element) => ({ element, rect: element.getBoundingClientRect() }))
+              .filter((item) => item.rect.bottom > viewport.top && item.rect.top < viewport.bottom)
+              .sort((a, b) => a.rect.top - b.rect.top)
+            state.visibleRows = new Set(visibleRows.map((item) => item.element))
+            const rows = visibleRows.map((item) => item.rect)
+            rows.slice(1).forEach((rect, index) => {
+              const previous = rows[index]!
+              state.maxOverlap = Math.max(state.maxOverlap, previous.bottom - rect.top)
+              state.maxGap = Math.max(state.maxGap, rect.top - previous.bottom)
+            })
+            const partTop = part.getBoundingClientRect().top
+            state.maxPartTopMovement = Math.max(state.maxPartTopMovement, Math.abs(partTop - state.previousPartTop))
+            state.previousPartTop = partTop
+          }
+          const visibleRow = [...root.querySelectorAll<HTMLElement>("[data-timeline-row]")].some((element) => {
+            const rect = element.getBoundingClientRect()
+            return rect.bottom > viewport.top && rect.top < viewport.bottom
+          })
+          if (!visibleRow) state.blanks += 1
+          if (profileVisual) {
+            const subtrees = new Map<string, { element: Element; rendered: boolean }>()
+            const visibleSubtrees = new Map<string, Element>()
+            root.querySelectorAll(critical).forEach((element) => {
+              const key = describe(element)
+              const rect = element.getBoundingClientRect()
+              const style = getComputedStyle(element)
+              const rendered =
+                element.isConnected &&
+                rect.width > 0 &&
+                rect.height > 0 &&
+                style.display !== "none" &&
+                style.visibility !== "hidden" &&
+                Number(style.opacity) > 0
+              subtrees.set(key, { element, rendered })
+              if (rendered && rect.bottom > viewport.top && rect.top < viewport.bottom) {
+                const previous = state.visibleSubtrees.get(key)
+                if (previous && previous !== element && key.startsWith(`${textPartID}:`))
+                  state.visibleSubtreeReplacements += 1
+                visibleSubtrees.set(key, element)
+              }
+            })
+            state.visibleSubtrees.forEach((element, key) => {
+              const current = subtrees.get(key)
+              if (key.startsWith(`${textPartID}:`) && !current?.rendered) {
+                const markdown = part.querySelector<HTMLElement>('[data-component="markdown"]')
+                state.visibleSubtreeDropouts.push(
+                  `${key}:projection=${markdown?.dataset.markdownProjectionLength}/${markdown?.dataset.markdownProjectionBlocks}:result=${markdown?.dataset.markdownResultLength}/${markdown?.dataset.markdownResultBlocks}:applied=${markdown?.dataset.markdownAppliedBlocks}:dom=${markdown?.children.length}`,
+                )
+              }
+              if (element.matches('[data-component="file"]')) {
+                const hadLines = element.hasAttribute("data-profiler-had-lines")
+                const hasLines = element.shadowRoot?.querySelector("[data-line]") != null
+                if (hasLines) element.setAttribute("data-profiler-had-lines", "")
+                if (hadLines && !hasLines) state.visibleSubtreeDropouts.push(`${key}:shadow-lines`)
+              }
+            })
+            state.visibleSubtrees = visibleSubtrees
+          }
+          if (profileVisual && duration > 33.34) {
+            const livePart = currentPart()
+            const content = livePart?.textContent ?? ""
+            const complete = content.includes("benchmark-complete")
+            const index = complete
+              ? finalIndex
+              : Number(content.match(new RegExp(markerPattern, "g"))?.at(-1)?.match(/\d+/)?.[0] ?? -1)
+            state.slowFrames.push({
+              duration,
+              index,
+              phase: complete
+                ? "complete"
+                : index >= 0 && index % fragmentCount === 0
+                  ? "boundary"
+                  : index >= 0
+                    ? "stream"
+                    : "unknown",
+              tokenSpans: livePart?.querySelectorAll(".shiki span").length ?? 0,
+              blocks: livePart?.querySelectorAll("[data-markdown-block]").length ?? 0,
+              codeBlocks: livePart?.querySelectorAll('[data-component="markdown-code"]').length ?? 0,
+              height: livePart?.getBoundingClientRect().height ?? 0,
+              distance: root.scrollHeight - root.clientHeight - root.scrollTop,
+            })
+          }
+          requestAnimationFrame(sample)
+        }, 0)
+      }
+      state.start = () => {
+        state.started = performance.now()
+        state.previous = state.started
+        state.running = true
+        requestAnimationFrame(sample)
+      }
+    },
+    { ...options, markerPattern: STREAM_MARKER_PATTERN, fragmentCount: STREAM_FRAGMENT_COUNT },
+  )
+}
+
+export function startTimelineStreamProbe(page: Page) {
+  return page.evaluate(() => {
+    const state = (window as Window & { __timelineStreamBenchmark?: TimelineProbeState }).__timelineStreamBenchmark
+    if (!state) throw new Error("missing streaming benchmark state")
+    state.start()
+  })
+}
+
+type LayoutShiftEntry = PerformanceEntry & { value: number; hadRecentInput?: boolean }
+
+export function layoutShiftValue(
+  entry: Pick<LayoutShiftEntry, "startTime" | "value" | "hadRecentInput">,
+  start: number,
+) {
+  if (entry.startTime < start || entry.hadRecentInput) return
+  return entry.value
+}
+
+export function removeVisibleRow<T>(visible: Set<T>, row: T) {
+  return visible.delete(row)
+}
+
+export function streamProgress(content: string) {
+  const index = Number(content.match(new RegExp(STREAM_MARKER_PATTERN, "g"))?.at(-1)?.match(/\d+/)?.[0] ?? -1)
+  return {
+    index,
+    phase: content.includes("benchmark-complete")
+      ? ("complete" as const)
+      : index >= 0 && index % STREAM_FRAGMENT_COUNT === 0
+        ? ("boundary" as const)
+        : index >= 0
+          ? ("stream" as const)
+          : ("unknown" as const),
+  }
+}
+
+export async function collectTimelineStreamMetrics(
+  page: Page,
+  options: { textPartID: string; finalIndex: number; navigations: string[] },
+) {
+  return page.evaluate(({ textPartID, finalIndex, navigations }) => {
+    const state = (window as Window & { __timelineStreamBenchmark?: TimelineProbeState }).__timelineStreamBenchmark
+    if (!state) throw new Error(`missing streaming benchmark state after navigation: ${JSON.stringify(navigations)}`)
+    state.ended = performance.now()
+    state.cleanup()
+    state.running = false
+    const part = document.querySelector<HTMLElement>(`[data-timeline-part-id="${textPartID}"]`)
+    const row = part?.closest<HTMLElement>("[data-timeline-row]")
+    const markdown = part?.querySelector<HTMLElement>('[data-component="markdown"]')
+    const sorted = state.frames.slice().sort((a, b) => a - b)
+    const duration = state.frames.reduce((sum, value) => sum + value, 0)
+    const longestSlowStreak = state.frames.reduce(
+      (result, value) => {
+        const current = value > 33.34 ? result.current + 1 : 0
+        return { current, longest: Math.max(result.longest, current) }
+      },
+      { current: 0, longest: 0 },
+    ).longest
+    const busyStart = state.applied.at(0)?.at
+    const completion = state.applied.find((value) => value.index === finalIndex)
+    const busyEnd = completion?.at
+    const busyFrames =
+      busyStart === undefined || busyEnd === undefined
+        ? []
+        : state.frames.filter((_, index) => state.frameAt[index]! >= busyStart && state.frameAt[index]! <= busyEnd)
+    const busySorted = busyFrames.slice().sort((a, b) => a - b)
+    const busyDuration = busyFrames.reduce((sum, value) => sum + value, 0)
+    const completionObservedMs = (completion?.at ?? NaN) - state.started
+    const visual = state.profileVisual
+      ? {
+          layoutShiftValueSum: state.layoutShifts.reduce((sum, value) => sum + value, 0),
+          maxLayoutShiftValue: Math.max(0, ...state.layoutShifts),
+          visibleMounts: state.visibleMounts,
+          visibleUnmounts: state.visibleUnmounts,
+          visibleSubtreeMounts: state.visibleSubtreeMounts,
+          visibleSubtreeUnmounts: [...new Set(state.visibleSubtreeUnmounts)],
+          visibleSubtreeReplacements: state.visibleSubtreeReplacements,
+          visibleSubtreeDropouts: [...new Set(state.visibleSubtreeDropouts)],
+          maxOverlapPx: state.maxOverlap,
+          maxGapPx: state.maxGap,
+          maxPartTopMovementPx: state.maxPartTopMovement,
+          slowestRafGaps: state.slowFrames
+            .sort((a, b) => b.duration - a.duration)
+            .slice(0, 20)
+            .map((frame) => ({
+              durationMs: frame.duration,
+              index: frame.index,
+              phase: frame.phase,
+              tokenSpans: frame.tokenSpans,
+              blocks: frame.blocks,
+              codeBlocks: frame.codeBlocks,
+              heightPx: frame.height,
+              distancePx: frame.distance,
+            })),
+          slowRafGapPhases: Object.fromEntries(
+            ["stream", "boundary", "complete", "unknown"].map((phase) => {
+              const frames = state.slowFrames.filter((frame) => frame.phase === phase)
+              return [
+                phase,
+                {
+                  count: frames.length,
+                  totalMs: frames.reduce((sum, frame) => sum + frame.duration, 0),
+                  maxMs: Math.max(0, ...frames.map((frame) => frame.duration)),
+                },
+              ]
+            }),
+          ),
+          scroll: state.scroll,
+        }
+      : null
+    const geometry = state.minimal
+      ? null
+      : {
+          maxDistancePx: Math.max(0, ...state.geometry.map((sample) => sample.distance)),
+          finalDistancePx: state.geometry.at(-1)?.distance ?? 0,
+          final: state.geometry.at(-1),
+          distanceTransitionsPx: state.geometry
+            .map((sample) => Math.round(sample.distance))
+            .filter((value, index, values) => index === 0 || value !== values[index - 1]),
+          bottomDriftTransitions: state.geometry.slice(1).filter((value, index) => {
+            const previous = state.geometry[index]?.distance ?? 0
+            return previous <= 1 && value.distance > 1
+          }).length,
+          blankSamples: state.blanks,
+        }
+    return {
+      capabilities: { visual: state.profileVisual, geometry: !state.minimal },
+      completionObservedMs,
+      deltasPerSecond: Number.isFinite(completionObservedMs) ? finalIndex / (completionObservedMs / 1_000) : null,
+      rafGapSamples: state.frames.length,
+      rafCallbackRate: duration ? (state.frames.length * 1000) / duration : 0,
+      observedProgressWindowRafCallbackRate: busyDuration ? (busyFrames.length * 1000) / busyDuration : null,
+      observedProgressWindowRafGapP95Ms: busySorted[Math.floor(busySorted.length * 0.95)] ?? null,
+      observedProgressWindowRafGaps: busyFrames.length,
+      maxObservedProgressIndex: Math.max(-1, ...state.applied.map((value) => value.index)),
+      observedProgressTransitions: state.applied.length,
+      rafGapP50Ms: sorted[Math.floor(sorted.length * 0.5)] ?? 0,
+      rafGapP95Ms: sorted[Math.floor(sorted.length * 0.95)] ?? 0,
+      rafGapP99Ms: sorted[Math.floor(sorted.length * 0.99)] ?? 0,
+      maxRafGapMs: sorted.at(-1) ?? 0,
+      rafGapsOver33Ms: state.frames.filter((value) => value > 33.34).length,
+      rafGapsOver50Ms: state.frames.filter((value) => value > 50).length,
+      missedFrameBudgetEquivalents: state.frames.reduce(
+        (sum, value) => sum + Math.max(0, Math.round(value / 16.67) - 1),
+        0,
+      ),
+      longestRafGapOver33MsStreak: longestSlowStreak,
+      longTaskCount: state.longTasks.length,
+      longTaskTimeMs: state.longTasks.reduce((sum, value) => sum + value, 0),
+      visual,
+      geometry,
+      rowReplaced: row !== state.row,
+      markdownReplaced: markdown !== state.markdown,
+      domTextCharacters: part?.textContent?.length ?? 0,
+    }
+  }, options)
+}
@@ -0,0 +1,335 @@
+const words = [
+  "alpha",
+  "bravo",
+  "charlie",
+  "delta",
+  "echo",
+  "foxtrot",
+  "golf",
+  "hotel",
+  "india",
+  "juliet",
+  "kilo",
+  "lima",
+  "metro",
+  "nova",
+  "orbit",
+  "pixel",
+  "quartz",
+  "river",
+  "signal",
+  "vector",
+]
+
+const sourceID = "ses_smoke_source"
+const targetID = "ses_smoke_target"
+const directory = "C:/OpenCode/SmokeProject"
+const projectID = "proj_smoke_timeline"
+const model = { providerID: "opencode", modelID: "claude-opus-4-6", variant: "max" }
+
+type MessageInfo = Record<string, unknown> & { id: string; role: "user" | "assistant" }
+type MessagePart = Record<string, unknown> & { id: string; type: string; text?: string; tool?: string }
+type Message = { info: MessageInfo; parts: MessagePart[] }
+
+function lorem(seed: number, length: number) {
+  let out = ""
+  let i = seed
+  while (out.length < length) {
+    const word = words[i % words.length]
+    out += (out ? " " : "") + word
+    if (i % 17 === 0) out += ".\n\n"
+    i += 7
+  }
+  return out.slice(0, length)
+}
+
+function id(prefix: string, value: number) {
+  return `${prefix}_smoke_${String(value).padStart(4, "0")}`
+}
+
+function userMessage(sessionID: string, index: number, textLength: number, diffs: unknown[] = []): Message {
+  const messageID = id("msg_user", index)
+  return {
+    info: {
+      id: messageID,
+      sessionID,
+      role: "user",
+      time: { created: 1700000000000 + index * 10_000 },
+      summary: { diffs },
+      agent: "build",
+      model,
+    },
+    parts: [
+      {
+        id: id("prt_user_text", index),
+        sessionID,
+        messageID,
+        type: "text",
+        text: lorem(index, textLength),
+      },
+    ],
+  }
+}
+
+function assistantMessage(sessionID: string, index: number, parentID: string, parts: MessagePart[]): Message {
+  const messageID = id("msg_assistant", index)
+  return {
+    info: {
+      id: messageID,
+      sessionID,
+      role: "assistant",
+      time: { created: 1700000000000 + index * 10_000 + 1_000, completed: 1700000000000 + index * 10_000 + 8_000 },
+      parentID,
+      modelID: model.modelID,
+      providerID: model.providerID,
+      mode: "build",
+      agent: "build",
+      path: { cwd: directory, root: directory },
+      cost: 0.01,
+      tokens: { input: 100, output: 200, reasoning: 0, cache: { read: 0, write: 0 } },
+      variant: "max",
+      finish: "stop",
+    },
+    parts: parts.map((part) => ({
+      ...part,
+      sessionID,
+      messageID,
+    })),
+  }
+}
+
+function textPart(index: number, partIndex: number, length: number): MessagePart {
+  const prose = lorem(index * 13 + partIndex, length)
+  const text =
+    index % 12 === 0
+      ? `${prose}\n\n\`\`\`ts\n${code(index, 80)}\n\`\`\``
+      : index % 5 === 0
+        ? `${prose}\n\n\`\`\`ts\nexport const value = "${lorem(index, 220)}"\n\`\`\``
+        : index % 7 === 0
+          ? `${prose}\n\nThe wrapped inline value is \`${lorem(index, 180)}\`.`
+          : prose
+  return { id: id(`prt_text_${partIndex}`, index), type: "text", text }
+}
+
+function reasoningPart(index: number, partIndex: number, length: number): MessagePart {
+  return {
+    id: id(`prt_reasoning_${partIndex}`, index),
+    type: "reasoning",
+    text: lorem(index * 19 + partIndex, length),
+    time: { start: 1700000000000 + index * 10_000, end: 1700000000000 + index * 10_000 + 500 },
+  }
+}
+
+function toolPart(
+  index: number,
+  partIndex: number,
+  tool: string,
+  input: Record<string, unknown>,
+  outputLength = 160,
+): MessagePart {
+  const metadata =
+    tool === "apply_patch"
+      ? { files: [patchFile(index, "update"), patchFile(index + 1, index % 2 === 0 ? "add" : "delete")] }
+      : tool === "edit" || tool === "write"
+        ? {
+            filediff: fileDiff(String(input.filePath ?? `src/generated/file-${index}.ts`), index),
+            diff: patch(index, outputLength),
+            preview: patch(index + 1, 420),
+          }
+        : tool === "question"
+          ? { answers: [["Proceed"], ["Keep sample output"]] }
+          : {}
+  return {
+    id: id(`prt_tool_${tool}_${partIndex}`, index),
+    type: "tool",
+    callID: id("call", index * 10 + partIndex),
+    tool,
+    state: {
+      status: "completed",
+      input,
+      output: lorem(index * 23 + partIndex, outputLength),
+      title: tool === "bash" ? "Verify generated output" : input.filePath || input.path || input.pattern || "completed",
+      metadata,
+      time: { start: 1700000000000 + index * 10_000, end: 1700000000000 + index * 10_000 + 400 },
+    },
+  }
+}
+
+function patchFile(seed: number, type: "add" | "update" | "delete") {
+  return {
+    filePath: `src/generated/patch-${seed}.ts`,
+    relativePath: `src/generated/patch-${seed}.ts`,
+    type,
+    additions: (seed % 7) + 1,
+    deletions: type === "add" ? 0 : seed % 4,
+    patch: patch(seed, 520),
+    before: type === "add" ? undefined : code(seed, 18),
+    after: type === "delete" ? undefined : code(seed + 1, 24),
+  }
+}
+
+function fileDiff(file: string, seed: number) {
+  const lines = seed % 12 === 0 ? 300 : seed % 8 === 0 ? 2 : 38
+  const before = code(seed, lines, seed % 10 === 0 ? 280 : 32)
+  const after =
+    lines === 2
+      ? before.replace("value1", "updatedValue1")
+      : lines === 300
+        ? code(seed + 1, lines, seed % 10 === 0 ? 280 : 32)
+        : before.replace("value4", "updatedValue4").replace("value20", "updatedValue20")
+  return {
+    file,
+    additions: lines === 300 ? 300 : lines === 2 ? 1 : 2,
+    deletions: lines === 300 ? 300 : lines === 2 ? 1 : 2,
+    before,
+    after,
+  }
+}
+
+function patch(seed: number, length: number) {
+  return `diff --git a/src/generated/file-${seed}.ts b/src/generated/file-${seed}.ts\n+${lorem(seed, length).replace(/\n/g, "\n+")}`
+}
+
+function code(seed: number, lines: number, width = 32) {
+  return Array.from(
+    { length: lines },
+    (_, index) => `export const value${index} = "${lorem(seed + index, width)}"`,
+  ).join("\n")
+}
+
+function turn(index: number): Message[] {
+  const diff = index % 9 === 0 ? [fileDiff(`src/generated/summary-${index}.ts`, index)] : []
+  const user = userMessage(targetID, index, 100 + (index % 4) * 80, diff)
+  const parts = [
+    ...(index % 5 === 0 ? [reasoningPart(index, 0, 420)] : []),
+    ...(index % 3 === 0
+      ? [
+          toolPart(index, 0, "read", { filePath: `src/generated/file-${index}.ts`, offset: 0, limit: 80 }, 220),
+          toolPart(index, 5, "glob", { path: directory, pattern: `**/*sample-${index}*.ts` }, 140),
+          toolPart(index, 1, "grep", { path: directory, pattern: `sample-${index}`, include: "*.ts" }, 180),
+          toolPart(index, 6, "list", { path: `src/generated/${index}` }, 120),
+        ]
+      : []),
+    textPart(index, 2, 160 + (index % 6) * 90),
+    ...(index % 4 === 0 ? [toolPart(index, 3, "edit", { filePath: `src/generated/file-${index}.ts` }, 700)] : []),
+    ...(index % 6 === 0
+      ? [toolPart(index, 7, "write", { filePath: `src/generated/write-${index}.ts`, content: code(index, 28) }, 560)]
+      : []),
+    ...(index % 8 === 0
+      ? [toolPart(index, 8, "apply_patch", { files: [`src/generated/patch-${index}.ts`] }, 620)]
+      : []),
+    ...(index % 7 === 0
+      ? [toolPart(index, 4, "bash", { command: "bun typecheck", description: "Verify generated output" }, 620)]
+      : []),
+    ...(index % 10 === 0 ? [toolPart(index, 9, "webfetch", { url: "https://example.com/docs/sample" }, 120)] : []),
+    ...(index % 11 === 0 ? [toolPart(index, 10, "websearch", { query: "sample movement notes" }, 240)] : []),
+    ...(index % 13 === 0
+      ? [
+          toolPart(
+            index,
+            11,
+            "question",
+            { questions: [{ question: "Use generated fixture?" }, { question: "Keep same row shape?" }] },
+            120,
+          ),
+        ]
+      : []),
+    ...(index % 17 === 0
+      ? [toolPart(index, 12, "task", { description: "Inspect generated fixture", subagent_type: "explore" }, 160)]
+      : []),
+  ]
+  return [user, assistantMessage(targetID, index, user.info.id, parts)]
+}
+
+const targetMessages = Array.from({ length: 72 }, (_, index) => turn(index)).flat()
+const sourceMessages = Array.from({ length: 12 }, (_, index) => [
+  userMessage(sourceID, index + 1000, 120),
+  assistantMessage(sourceID, index + 1000, id("msg_user", index + 1000), [textPart(index + 1000, 0, 240)]),
+]).flat()
+
+function renderable(part: MessagePart) {
+  if (part.type === "tool" && part.tool === "todowrite") return false
+  if (part.type === "text") return !!part.text.trim()
+  if (part.type === "reasoning") return !!part.text.trim()
+  return part.type !== "step-start" && part.type !== "step-finish" && part.type !== "patch"
+}
+
+function orderedParts(message: Message) {
+  return message.parts.slice().sort((a, b) => a.id.localeCompare(b.id))
+}
+
+export const fixture = {
+  directory,
+  project: {
+    id: projectID,
+    worktree: directory,
+    vcs: "git",
+    name: "smoke-project",
+    time: { created: 1700000000000, updated: 1700000000000 },
+    sandboxes: [],
+  },
+  provider: {
+    all: [
+      {
+        id: "opencode",
+        name: "OpenCode",
+        models: { "claude-opus-4-6": { id: "claude-opus-4-6", name: "Claude Opus 4.6", limit: { context: 200_000 } } },
+      },
+    ],
+    connected: ["opencode"],
+    default: { providerID: "opencode", modelID: "claude-opus-4-6" },
+  },
+  sessions: [
+    {
+      id: sourceID,
+      slug: "source",
+      projectID,
+      directory,
+      title: "Uncommitted changes inquiry",
+      version: "dev",
+      time: { created: 1700000000000, updated: 1700000000000 },
+    },
+    {
+      id: targetID,
+      slug: "target",
+      projectID,
+      directory,
+      title: "Example Game: sample jump movement & sample physics analysis",
+      version: "dev",
+      time: { created: 1700000001000, updated: 1700000001000 },
+    },
+  ],
+  sourceID,
+  targetID,
+  messages: { [sourceID]: sourceMessages, [targetID]: targetMessages },
+  expected: {
+    sourceTitle: "Uncommitted changes inquiry",
+    targetTitle: "Example Game: sample jump movement & sample physics analysis",
+    sourceMessageIDs: sourceMessages
+      .filter((message) => message.info.role === "user")
+      .map((message) => message.info.id),
+    targetMessageIDs: targetMessages
+      .filter((message) => message.info.role === "user")
+      .map((message) => message.info.id),
+    targetPartIDs: targetMessages.flatMap((message) =>
+      orderedParts(message)
+        .filter(renderable)
+        .map((part) => part.id),
+    ),
+  },
+}
+
+export function pageMessages(sessionID: string, limit: number, before?: string) {
+  const messages = fixture.messages[sessionID as keyof typeof fixture.messages] ?? []
+  const end = before
+    ? Math.max(
+        0,
+        messages.findIndex((message) => message.info.id === before),
+      )
+    : messages.length
+  const start = Math.max(0, end - limit)
+  return {
+    items: messages.slice(start, end),
+    cursor: start > 0 ? messages[start]!.info.id : undefined,
+  }
+}
@@ -0,0 +1,67 @@
+import type { Page } from "@playwright/test"
+import { base64Encode } from "@opencode-ai/core/util/encode"
+import { mockOpenCodeServer } from "../../utils/mock-server"
+import { fixture } from "./session-timeline-stress.fixture"
+
+export async function installTimelineSettings(page: Page) {
+  await page.addInitScript(() => {
+    localStorage.setItem(
+      "settings.v3",
+      JSON.stringify({
+        general: {
+          editToolPartsExpanded: true,
+          shellToolPartsExpanded: true,
+          showReasoningSummaries: true,
+          showSessionProgressBar: true,
+        },
+      }),
+    )
+  })
+}
+
+export function mockStressTimeline(page: Page) {
+  return mockOpenCodeServer(page, {
+    sessions: fixture.sessions,
+    provider: fixture.provider,
+    directory: fixture.directory,
+    project: fixture.project,
+    pageMessages: (sessionID) => ({ items: fixture.messages[sessionID as keyof typeof fixture.messages] ?? [] }),
+  })
+}
+
+export async function installStressSessionTabs(page: Page) {
+  const server = `http://${process.env.PLAYWRIGHT_SERVER_HOST ?? "127.0.0.1"}:${process.env.PLAYWRIGHT_SERVER_PORT ?? "4096"}`
+  await page.addInitScript(
+    ({ directory, sourceID, targetID, dirBase64, server }) => {
+      localStorage.setItem(
+        "opencode.global.dat:server",
+        JSON.stringify({
+          projects: { local: [{ worktree: directory, expanded: true }] },
+          lastProject: { local: directory },
+        }),
+      )
+      localStorage.setItem(
+        "opencode.global.dat:tabs",
+        JSON.stringify(
+          [sourceID, targetID].map((sessionId) => ({
+            type: "session",
+            server,
+            dirBase64,
+            sessionId,
+          })),
+        ),
+      )
+    },
+    {
+      directory: fixture.directory,
+      sourceID: fixture.sourceID,
+      targetID: fixture.targetID,
+      dirBase64: base64Encode(fixture.directory),
+      server,
+    },
+  )
+}
+
+export function stressSessionHref(sessionID: string) {
+  return `/${base64Encode(fixture.directory)}/session/${sessionID}`
+}
@@ -0,0 +1,15 @@
+import { expect, test } from "bun:test"
+import { mkdtemp, rm } from "node:fs/promises"
+import path from "node:path"
+import os from "node:os"
+import { prepareChromeTrace } from "../chrome-trace"
+
+test("creates the configured trace directory", async () => {
+  const root = await mkdtemp(path.join(os.tmpdir(), "opencode-trace-"))
+  try {
+    const file = await prepareChromeTrace(path.join(root, "nested", "traces"), "session/tab", false, "test")
+    expect(file).toEndWith("-session-tab-458ed9e3-test.json")
+  } finally {
+    await rm(root, { recursive: true, force: true })
+  }
+})
@@ -0,0 +1,42 @@
+import { expect, test } from "bun:test"
+import { compressCachedRepaintTrace, layoutShiftSample } from "../timeline/session-tab-repaint-probe"
+
+test("compresses repeated repaint states without losing frame samples", () => {
+  const state = {
+    root: 1,
+    scrollTop: 10,
+    scrollHeight: 20,
+    bottomErrorPx: 0,
+    last: true,
+    rows: [{ key: "row", node: 2, top: 0, bottom: 10 }],
+    mounted: 1,
+    center: "content",
+  }
+  const trace = {
+    timeOriginEpochMs: 1_000,
+    startedAtPerformanceMs: 100,
+    samples: [
+      { observedAtMs: 16, ...state, destination: ["target"], source: [] },
+      { observedAtMs: 32, ...state, destination: ["target"], source: [] },
+      { observedAtMs: 48, ...state, scrollTop: 11, destination: ["target"], source: [] },
+    ],
+    mutations: [{ observedAtMs: 20, changed: [{ type: "add", node: 2 }] }],
+    shifts: [{ occurredAtMs: 24, value: 0.1 }],
+    windowMs: 1_000,
+    running: false,
+    stop() {},
+  }
+  const compressed = compressCachedRepaintTrace(trace)
+  const samples = compressed.samples.flatMap((group) =>
+    group.observedAtMs.map((observedAtMs) => ({ observedAtMs, ...group.state })),
+  )
+
+  expect(samples).toEqual(trace.samples)
+  expect(compressed.mutations).toEqual(trace.mutations)
+  expect(compressed.shifts).toEqual(trace.shifts)
+})
+
+test("records layout shifts at occurrence time within the probe window", () => {
+  expect(layoutShiftSample({ startTime: 99, value: 0.1 }, 100)).toBeUndefined()
+  expect(layoutShiftSample({ startTime: 124, value: 0.2 }, 100)).toEqual({ occurredAtMs: 24, value: 0.2 })
+})
@@ -0,0 +1,54 @@
+import { expect, test } from "bun:test"
+import { classifySessionSwitch } from "../timeline/session-tab-switch-metrics"
+
+test("counts source and blank samples before the destination is observed", () => {
+  const result = classifySessionSwitch([
+    { observedAtMs: 16, destination: [], source: ["source"], hasVisibleRows: true, last: false },
+    { observedAtMs: 32, destination: [], source: [], hasVisibleRows: false, last: false },
+    { observedAtMs: 48, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+    { observedAtMs: 64, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+    { observedAtMs: 80, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+  ])
+
+  expect(result.blankSamples).toBe(1)
+  expect(result.sourceSamples).toBe(1)
+  expect(result.unknownSamples).toBe(0)
+  expect(result.firstDestinationObservedMs).toBe(48)
+  expect(result.stableObservedMs).toBe(80)
+})
+
+test("does not classify mixed source and destination content as correct", () => {
+  const result = classifySessionSwitch([
+    {
+      observedAtMs: 16,
+      destination: ["destination"],
+      source: ["source"],
+      hasVisibleRows: true,
+      last: true,
+      bottomErrorPx: 0,
+    },
+    { observedAtMs: 32, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+    { observedAtMs: 48, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+    { observedAtMs: 64, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+  ])
+
+  expect(result.firstCorrectObservedMs).toBe(32)
+  expect(result.stableObservedMs).toBe(64)
+})
+
+test("reports missing correctness without throwing", () => {
+  const result = classifySessionSwitch([
+    {
+      observedAtMs: 16,
+      destination: ["destination"],
+      source: ["source"],
+      hasVisibleRows: true,
+      last: true,
+      bottomErrorPx: 0,
+    },
+  ])
+
+  expect(result.firstDestinationObservedMs).toBe(16)
+  expect(result.firstCorrectObservedMs).toBeNull()
+  expect(result.stableObservedMs).toBeNull()
+})
@@ -0,0 +1,14 @@
+import { expect, test } from "bun:test"
+import { streamChunk } from "../timeline/session-timeline-benchmark.fixture"
+import { streamProgress } from "../timeline/session-timeline-stream-probe"
+
+test("classifies emitted stream markers using the fixture cycle", () => {
+  expect(streamProgress("before stream-17 after stream-18")).toEqual({ index: 18, phase: "boundary" })
+  expect(streamProgress("before stream-18 after stream-19")).toEqual({ index: 19, phase: "stream" })
+  expect(streamProgress("benchmark-complete stream-36")).toEqual({ index: 36, phase: "complete" })
+  expect(streamProgress("no marker")).toEqual({ index: -1, phase: "unknown" })
+})
+
+test("emits progress markers at fixture boundaries", () => {
+  expect(streamProgress(streamChunk(18, 160))).toEqual({ index: 18, phase: "boundary" })
+})
@@ -0,0 +1,16 @@
+import { expect, test } from "bun:test"
+import { layoutShiftValue, removeVisibleRow } from "../timeline/session-timeline-stream-probe"
+
+test("excludes layout shifts before the probe window and recent input", () => {
+  expect(layoutShiftValue({ startTime: 9, value: 0.1 }, 10)).toBeUndefined()
+  expect(layoutShiftValue({ startTime: 10, value: 0.2, hadRecentInput: true }, 10)).toBeUndefined()
+  expect(layoutShiftValue({ startTime: 11, value: 0.3 }, 10)).toBe(0.3)
+})
+
+test("classifies removed rows from their last painted visibility", () => {
+  const row = {}
+  const visible = new Set([row])
+
+  expect(removeVisibleRow(visible, row)).toBe(true)
+  expect(removeVisibleRow(visible, row)).toBe(false)
+})
@@ -147,7 +147,8 @@ test.describe("regression: session timeline local row state", () => {

    const wrapper = page.locator(`[data-timeline-part-id="${editPartID}"]`).first()
    await expectAppVisible(wrapper)
-    await expectAppVisible(wrapper.locator('[data-component="file"][data-mode="diff"]').first())
+    const file = wrapper.locator('[data-component="file"][data-mode="diff"]').first()
+    await expectAppVisible(file)
    await markDiffProbe(page)

    events.push({
@@ -159,7 +160,15 @@ test.describe("regression: session timeline local row state", () => {
    })

    await expect(page.locator(`[data-timeline-part-id="${textPartID}"]`).first()).toBeVisible({ timeout: 10_000 })
-    expect(await readDiffProbe(page)).toEqual({ fileMarker: "before", shadowRoots: 0, toolMarker: "before" })
+    const siblingProbe = await readDiffProbe(page)
+    expect(siblingProbe).toEqual({
+      fileMarker: "before",
+      frameMarker: "before",
+      rowKey: `assistant-part:${userMessageID}:part:${assistantMessageID}:${editPartID}`,
+      rowMarker: "before",
+      shadowRoots: 0,
+      toolMarker: "before",
+    })

    await markDiffProbe(page)
    events.push({
@@ -173,7 +182,73 @@ test.describe("regression: session timeline local row state", () => {
    await expect(wrapper.locator('[data-slot="diff-changes-additions"]').filter({ hasText: "+2" }).first()).toBeVisible(
      { timeout: 10_000 },
    )
-    expect(await readDiffProbe(page)).toEqual({ fileMarker: "before", shadowRoots: 0, toolMarker: "before" })
+    expect(await readDiffProbe(page)).toEqual({
+      fileMarker: "before",
+      frameMarker: "before",
+      rowKey: `assistant-part:${userMessageID}:part:${assistantMessageID}:${editPartID}`,
+      rowMarker: "before",
+      shadowRoots: 0,
+      toolMarker: "before",
+    })
+  })
+
+  test("keeps a sticky edit header aligned with a multi-hunk diff", async ({ page }) => {
+    const events: EventPayload[] = []
+    const lines = Array.from({ length: 1_000 }, (_, index) => `export const value${index} = ${index}\n`).join("")
+    const after = [100, 300, 500, 700, 900].reduce(
+      (result, index) =>
+        result.replace(`export const value${index} = ${index}`, `export const value${index} = compute(${index})`),
+      lines,
+    )
+    const part = {
+      ...editPart,
+      state: {
+        ...editPart.state,
+        metadata: {
+          ...editPart.state.metadata,
+          filediff: {
+            file: "src/regression.ts",
+            additions: 1,
+            deletions: 1,
+            before: lines,
+            after,
+          },
+        },
+      },
+    }
+    await mockServer(page, events, [userMessage, { ...assistantMessage, parts: [part] }])
+    await configurePage(page)
+
+    await page.goto(`/${base64Encode(directory)}/session/${sessionID}`)
+    await expectSessionTitle(page, title)
+
+    const wrapper = page.locator(`[data-timeline-part-id="${editPartID}"]`).first()
+    const trigger = wrapper.locator('[data-slot="collapsible-trigger"]').first()
+    const diff = wrapper.locator('[data-component="edit-content"]').first()
+    await expectAppVisible(diff)
+    await expect.poll(() => wrapper.evaluate((element) => element.getBoundingClientRect().height)).toBeGreaterThan(500)
+    const samples = await wrapper.evaluate(async (element) => {
+      const root = element.closest<HTMLElement>(".scroll-view__viewport")!
+      element.scrollIntoView({ block: "start" })
+      const result = []
+      for (const offset of [0, 120, 240, 360, 480]) {
+        root.scrollBy(0, offset - (result.at(-1)?.offset ?? 0))
+        await new Promise(requestAnimationFrame)
+        const trigger = element.querySelector<HTMLElement>('[data-slot="collapsible-trigger"]')!
+        const diff = element.querySelector<HTMLElement>('[data-component="edit-content"]')!
+        result.push({
+          offset,
+          trigger: trigger.getBoundingClientRect().y,
+          diff: diff.getBoundingClientRect().y,
+          bottom: element.getBoundingClientRect().bottom,
+        })
+      }
+      return result
+    })
+
+    expect(samples[0]!.trigger).toBeLessThan(samples[0]!.diff)
+    expect(samples.every((sample) => Math.abs(sample.trigger - samples[0]!.trigger) <= 1)).toBe(true)
+    expect(samples.every((sample) => sample.trigger < sample.bottom)).toBe(true)
  })
 })

@@ -247,10 +322,16 @@ async function markDiffProbe(page: Page) {
    .evaluate((element) => {
      const tool = element as HTMLElement
      const file = tool.querySelector<HTMLElement>('[data-component="file"][data-mode="diff"]')
+      const row = tool.closest<HTMLElement>("[data-timeline-key]")
+      const frame = tool.closest<HTMLElement>("[data-timeline-row]")
      if (!file) throw new Error("missing edit diff file")
+      if (!row) throw new Error("missing virtual timeline row")
+      if (!frame) throw new Error("missing timeline row frame")

      tool.dataset.timelineProbe = "before"
      file.dataset.timelineProbe = "before"
+      row.dataset.timelineProbe = "before"
+      frame.dataset.timelineProbe = "before"
      window.__timelineDiffProbe.reset()
    })
 }
@@ -262,10 +343,15 @@ async function readDiffProbe(page: Page) {
    .evaluate((element) => {
      const tool = element as HTMLElement
      const file = tool.querySelector<HTMLElement>('[data-component="file"][data-mode="diff"]')
+      const row = tool.closest<HTMLElement>("[data-timeline-key]")
+      const frame = tool.closest<HTMLElement>("[data-timeline-row]")
      return {
        fileMarker: file?.dataset.timelineProbe,
        shadowRoots: window.__timelineDiffProbe.shadowRoots(),
        toolMarker: tool.dataset.timelineProbe,
+        rowMarker: row?.dataset.timelineProbe,
+        rowKey: row?.dataset.timelineKey,
+        frameMarker: frame?.dataset.timelineProbe,
      }
    })
 }
@@ -300,14 +386,15 @@ function readExpanded(element: Element) {
  return !!content && content.getBoundingClientRect().height > 0
 }

-async function mockServer(page: Page, events: EventPayload[]) {
+async function mockServer(page: Page, events: EventPayload[], messages = [userMessage, assistantMessage]) {
  await mockOpenCodeServer(page, {
    directory,
    project: project(),
    provider: provider(),
    sessions: [session()],
-    pageMessages: () => ({ items: [userMessage, assistantMessage] }),
-    events: () => events.splice(0),
+    pageMessages: () => ({ items: messages }),
+    events: () => events.splice(0, 1),
+    eventRetry: 16,
  })
 }

@@ -32,8 +32,6 @@ test.describe("regression: session timeline context group resize", () => {
    const samples = await sampleExpansion(page)
    const visibleOverlap = samples.filter((sample) => sample.frame >= 1 && sample.overlap > 0.5)

-    console.log("context resize samples", JSON.stringify(samples, null, 2))
-
    expect(samples[0]?.overlap).toBe(0)
    expect(visibleOverlap).toEqual([])
    expect(samples.at(-1)?.expanded).toBe("true")
@@ -115,13 +113,15 @@ async function sampleExpansion(page: Page) {

        let frame = 1
        const tick = () => {
-          capture(frame, "raf")
-          frame += 1
-          if (frame > 8) {
-            resolve(samples)
-            return
-          }
-          requestAnimationFrame(tick)
+          setTimeout(() => {
+            capture(frame, "painted")
+            frame += 1
+            if (frame > 8) {
+              resolve(samples)
+              return
+            }
+            requestAnimationFrame(tick)
+          }, 0)
        }
        requestAnimationFrame(tick)
      }),
@@ -30,6 +30,284 @@ type SmokeWindow = Window & {
 test.describe("smoke: session timeline", () => {
  test.setTimeout(240_000)

+  test("keeps the visible message fixed while prepending history", async ({ page }) => {
+    const requests: { before?: string; phase: "start" | "end"; at: number }[] = []
+    await mockOpenCodeServer(page, {
+      sessions: fixture.sessions,
+      provider: fixture.provider,
+      directory: fixture.directory,
+      project: fixture.project,
+      pageMessages,
+      messageDelay: 3_000,
+      onMessages: (input) => requests.push({ before: input.before, phase: input.phase, at: performance.now() }),
+    })
+    await configureSmokePage(page, fixture.directory)
+
+    await navigateToSession(page, fixture.directory, fixture.targetID, fixture.expected.targetTitle)
+    await waitForTimelineStable(page)
+    const scroller = timelineScroller(page)
+    await pointAtTimeline(page)
+    const deadline = Date.now() + 120_000
+    while (!requests.some((request) => request.before && request.phase === "start")) {
+      if (Date.now() >= deadline) throw new Error("Timed out scrolling to the history boundary")
+      await page.mouse.wheel(0, -240)
+      await page.waitForTimeout(20)
+    }
+    expect(requests.some((request) => request.before && request.phase === "end")).toBe(false)
+    for (let index = 0; index < 12; index++) {
+      await page.mouse.wheel(0, -120)
+      await page.waitForTimeout(20)
+    }
+    const keys = ["prt_user_text_smoke_0032", "prt_text_2_smoke_0032", "prt_tool_apply_patch_8_smoke_0032"]
+    const positions = () =>
+      scroller.evaluate((element, keys) => {
+        const top = element.getBoundingClientRect().top
+        return Object.fromEntries(
+          keys.map((key) => {
+            const row = element.querySelector<HTMLElement>(`[data-timeline-part-id="${key}"]`)
+            if (!row) throw new Error(`Missing stable timeline key: ${key}`)
+            return [key, Math.round((row.getBoundingClientRect().top - top) * devicePixelRatio) / devicePixelRatio]
+          }),
+        )
+      }, keys)
+    const before = await positions()
+    expect(requests.some((request) => request.before && request.phase === "end")).toBe(false)
+
+    await expect.poll(() => requests.some((request) => request.before && request.phase === "end")).toBe(true)
+    await waitForTimelineStable(page)
+    await expect.poll(positions).toEqual(before)
+  })
+
+  test("preserves the timeline gap above the composer", async ({ page }) => {
+    await mockOpenCodeServer(page, {
+      sessions: fixture.sessions,
+      provider: fixture.provider,
+      directory: fixture.directory,
+      project: fixture.project,
+      pageMessages,
+    })
+    await configureSmokePage(page, fixture.directory)
+
+    await navigateToSession(page, fixture.directory, fixture.targetID, fixture.expected.targetTitle)
+    await waitForTimelineStable(page)
+    const scroller = timelineScroller(page)
+    await scroller.evaluate((element) => {
+      element.scrollTop = element.scrollHeight
+    })
+    await waitForTimelineStable(page)
+
+    const spacer = scroller.locator('[data-timeline-row="bottom-spacer"]')
+    await expect(spacer).toBeVisible()
+    expect(await spacer.evaluate((element) => element.getBoundingClientRect().height)).toBe(64)
+    await expect
+      .poll(() => scroller.evaluate((element) => element.scrollHeight - element.clientHeight - element.scrollTop))
+      .toBeLessThanOrEqual(1)
+  })
+
+  test("paints cached session tabs at the latest message", async ({ page }) => {
+    await mockOpenCodeServer(page, {
+      sessions: fixture.sessions,
+      provider: fixture.provider,
+      directory: fixture.directory,
+      project: fixture.project,
+      pageMessages: (sessionID) => ({ items: fixture.messages[sessionID as keyof typeof fixture.messages] ?? [] }),
+    })
+    await configureSmokePage(page, fixture.directory)
+    await page.addInitScript(
+      ({ dirBase64, sourceID, targetID }) => {
+        localStorage.setItem(
+          "opencode.global.dat:tabs",
+          JSON.stringify(
+            [sourceID, targetID].map((sessionId) => ({
+              type: "session",
+              server: "http://127.0.0.1:4096",
+              dirBase64,
+              sessionId,
+            })),
+          ),
+        )
+      },
+      { dirBase64: base64Encode(fixture.directory), sourceID: fixture.sourceID, targetID: fixture.targetID },
+    )
+
+    await page.goto(`/${base64Encode(fixture.directory)}/session/${fixture.targetID}`)
+    await expectSessionTitle(page, fixture.expected.targetTitle)
+    await switchTitlebarSession(page, fixture.sourceID, fixture.expected.sourceTitle)
+
+    const destination = fixture.messages[fixture.targetID].map((message) => message.info.id)
+    const last = fixture.expected.targetMessageIDs.at(-1)!
+    await page.evaluate(
+      ({ destination, last }) => {
+        const ids = new Set(destination)
+        const samples: Array<{ ids: string[]; last: boolean; bottomError?: number }> = []
+        const firstPaintNodes = new WeakSet<Node>()
+        let firstPaint = false
+        let removedFirstPaintNodes = 0
+        let running = true
+        new MutationObserver((records) => {
+          if (!firstPaint || !running) return
+          records.forEach((record) =>
+            record.removedNodes.forEach((node) => {
+              if (firstPaintNodes.has(node)) removedFirstPaintNodes += 1
+              if (!(node instanceof Element)) return
+              node.querySelectorAll("*").forEach((element) => {
+                if (firstPaintNodes.has(element)) removedFirstPaintNodes += 1
+              })
+            }),
+          )
+        }).observe(document.documentElement, { childList: true, subtree: true })
+        const sample = () => {
+          if (!running) return
+          setTimeout(() => {
+            if (!running) return
+            const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
+              element.querySelector("[data-timeline-row]"),
+            )
+            if (root) {
+              const view = root.getBoundingClientRect()
+              const visible = [...root.querySelectorAll<HTMLElement>("[data-message-id]")]
+                .filter((element) => {
+                  const rect = element.getBoundingClientRect()
+                  return rect.bottom > view.top && rect.top < view.bottom
+                })
+                .map((element) => element.dataset.messageId!)
+                .filter((id) => ids.has(id))
+              const bottom = root
+                .querySelector<HTMLElement>('[data-timeline-row="bottom-spacer"]')
+                ?.getBoundingClientRect()
+              samples.push({ ids: visible, last: visible.includes(last), bottomError: bottom?.bottom - view.bottom })
+              if (!firstPaint && visible.includes(last) && Math.abs((bottom?.bottom ?? Infinity) - view.bottom) <= 1) {
+                firstPaint = true
+                root.querySelectorAll<HTMLElement>("[data-timeline-key]").forEach((row) => {
+                  const rect = row.getBoundingClientRect()
+                  if (rect.bottom <= view.top || rect.top >= view.bottom) return
+                  firstPaintNodes.add(row)
+                  row.querySelectorAll("*").forEach((element) => firstPaintNodes.add(element))
+                })
+              }
+            }
+            requestAnimationFrame(sample)
+          }, 0)
+        }
+        ;(
+          window as Window & {
+            __sessionTabPaint?: { samples: typeof samples; removed: () => number; stop: () => void }
+          }
+        ).__sessionTabPaint = {
+          samples,
+          removed: () => removedFirstPaintNodes,
+          stop: () => {
+            running = false
+          },
+        }
+        requestAnimationFrame(sample)
+      },
+      { destination, last },
+    )
+
+    await switchTitlebarSession(page, fixture.targetID, fixture.expected.targetTitle)
+    await page.waitForFunction(() =>
+      (
+        window as Window & { __sessionTabPaint?: { samples: Array<{ ids: string[] }> } }
+      ).__sessionTabPaint?.samples.some((sample) => sample.ids.length > 0),
+    )
+    await page.waitForTimeout(200)
+    const first = await page.evaluate(() => {
+      const probe = (
+        window as Window & {
+          __sessionTabPaint?: {
+            samples: Array<{ ids: string[]; last: boolean; bottomError?: number }>
+            removed: () => number
+            stop: () => void
+          }
+        }
+      ).__sessionTabPaint!
+      probe.stop()
+      return { first: probe.samples.find((sample) => sample.ids.length > 0), removed: probe.removed() }
+    })
+    expect(first.first?.last).toBe(true)
+    expect(Math.abs(first.first?.bottomError ?? Infinity)).toBeLessThanOrEqual(1)
+    expect(first.removed).toBe(0)
+  })
+
+  test("paints a cold session tab at the latest message", async ({ page }) => {
+    await mockOpenCodeServer(page, {
+      sessions: fixture.sessions,
+      provider: fixture.provider,
+      directory: fixture.directory,
+      project: fixture.project,
+      pageMessages: (sessionID) => ({ items: fixture.messages[sessionID as keyof typeof fixture.messages] ?? [] }),
+    })
+    await configureSmokePage(page, fixture.directory)
+    await page.addInitScript(
+      ({ dirBase64, sourceID, targetID }) => {
+        localStorage.setItem(
+          "opencode.global.dat:tabs",
+          JSON.stringify(
+            [sourceID, targetID].map((sessionId) => ({
+              type: "session",
+              server: "http://127.0.0.1:4096",
+              dirBase64,
+              sessionId,
+            })),
+          ),
+        )
+      },
+      { dirBase64: base64Encode(fixture.directory), sourceID: fixture.sourceID, targetID: fixture.targetID },
+    )
+    await page.goto(`/${base64Encode(fixture.directory)}/session/${fixture.sourceID}`)
+    await expectSessionTitle(page, fixture.expected.sourceTitle)
+    const last = fixture.expected.targetMessageIDs.at(-1)!
+    const destination = fixture.messages[fixture.targetID].map((message) => message.info.id)
+    await page.evaluate(
+      ({ destination, last }) => {
+        const ids = new Set(destination)
+        const samples: Array<{ destination: boolean; last: boolean; bottomError?: number }> = []
+        const sample = () => {
+          const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
+            element.querySelector("[data-timeline-row]"),
+          )
+          if (root) {
+            const view = root.getBoundingClientRect()
+            const spacer = root
+              .querySelector<HTMLElement>('[data-timeline-row="bottom-spacer"]')
+              ?.getBoundingClientRect()
+            const messages = [...root.querySelectorAll<HTMLElement>("[data-message-id]")].filter((element) => {
+              const rect = element.getBoundingClientRect()
+              return rect.bottom > view.top && rect.top < view.bottom
+            })
+            samples.push({
+              destination: messages.some((element) => ids.has(element.dataset.messageId!)),
+              last: messages.some((element) => element.dataset.messageId === last),
+              bottomError: spacer ? spacer.bottom - view.bottom : undefined,
+            })
+          }
+          requestAnimationFrame(() => setTimeout(sample, 0))
+        }
+        ;(window as Window & { __coldTabSamples?: typeof samples }).__coldTabSamples = samples
+        requestAnimationFrame(() => setTimeout(sample, 0))
+      },
+      { destination, last },
+    )
+
+    await switchTitlebarSession(page, fixture.targetID, fixture.expected.targetTitle)
+    await page.waitForFunction(() =>
+      (window as Window & { __coldTabSamples?: Array<{ destination: boolean }> }).__coldTabSamples?.some(
+        (sample) => sample.destination,
+      ),
+    )
+    const result = await page.evaluate(() => {
+      const samples = (
+        window as Window & {
+          __coldTabSamples?: Array<{ destination: boolean; last: boolean; bottomError?: number }>
+        }
+      ).__coldTabSamples!
+      return samples.find((sample) => sample.destination)!
+    })
+    expect(result.last).toBe(true)
+    expect(Math.abs(result.bottomError ?? Infinity)).toBeLessThanOrEqual(1)
+  })
+
  test("renders seeded timeline in order while paging through history", async ({ page }) => {
    const errors = trackPageErrors(page)
    await mockOpenCodeServer(page, {
@@ -427,6 +705,14 @@ async function navigateToSession(page: Page, directory: string, sessionId: strin
  await expectSessionTitle(page, expectedTitle)
 }

+async function switchTitlebarSession(page: Page, sessionID: string, title: string) {
+  const href = `/${base64Encode(fixture.directory)}/session/${sessionID}`
+  const tab = page.locator(`[data-slot="titlebar-tabs"] a[href="${href}"]`).first()
+  await expect(tab).toBeVisible()
+  await tab.click()
+  await expectSessionTitle(page, title)
+}
+
 async function expectSessionReady(page: Page) {
  await expectAppVisible(page.getByRole("textbox", { name: /Ask anything/i }))
 }
@@ -18,7 +18,10 @@ export interface MockServerConfig {
  project: unknown
  sessions: ({ id: string } & Record<string, unknown>)[]
  pageMessages: (sessionId: string, limit: number, before?: string) => { items: unknown[]; cursor?: string }
+  messageDelay?: number
+  onMessages?: (input: { sessionID: string; before?: string; phase: "start" | "end" }) => void
  events?: () => unknown[]
+  eventRetry?: number
 }

 export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
@@ -41,10 +44,13 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
  await page.route("**/*", async (route) => {
    const url = new URL(route.request().url())
    const targetPort = process.env.PLAYWRIGHT_SERVER_PORT ?? "4096"
-    if (url.port !== targetPort) return route.fallback()
+    const appPort = new URL(
+      process.env.PLAYWRIGHT_BASE_URL ?? `http://127.0.0.1:${process.env.PLAYWRIGHT_PORT ?? "3000"}`,
+    ).port
+    if (url.port !== targetPort && url.port !== appPort) return route.fallback()

    const path = url.pathname
-    if (path === "/global/event" || path === "/event") return sse(route, config.events?.())
+    if (path === "/global/event" || path === "/event") return sse(route, config.events?.(), config.eventRetry)
    if (path === "/global/health") return json(route, { healthy: true })
    if (emptyObject.has(path)) return json(route, {})
    if (emptyList.has(path)) return json(route, [])
@@ -60,13 +66,17 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {

    const messagesMatch = path.match(/^\/session\/([^/]+)\/message$/)
    if (messagesMatch) {
-      const limit = Number(url.searchParams.get("limit") ?? 80)
      const before = url.searchParams.get("before") ?? undefined
+      config.onMessages?.({ sessionID: messagesMatch[1], before, phase: "start" })
+      if (config.messageDelay) await new Promise((resolve) => setTimeout(resolve, config.messageDelay))
+      const limit = Number(url.searchParams.get("limit") ?? 80)
      const pageData = config.pageMessages(messagesMatch[1], limit, before)
+      config.onMessages?.({ sessionID: messagesMatch[1], before, phase: "end" })
      return json(route, pageData.items, pageData.cursor ? { "x-next-cursor": pageData.cursor } : undefined)
    }

-    return json(route, {})
+    if (url.port === targetPort && targetPort !== appPort) return json(route, {})
+    return route.fallback()
  })
 }

@@ -83,10 +93,10 @@ function json(route: Route, body: unknown, headers?: Record<string, string>) {
  })
 }

-function sse(route: Route, events?: unknown[]) {
+function sse(route: Route, events?: unknown[], retry?: number) {
  return route.fulfill({
    status: 200,
    contentType: "text/event-stream",
-    body: events?.map((event) => `data: ${JSON.stringify(event)}\n\n`).join("") || ": ok\n\n",
+    body: `${retry === undefined ? "" : `retry: ${retry}\n\n`}${events?.map((event) => `data: ${JSON.stringify(event)}\n\n`).join("") || ": ok\n\n"}`,
  })
 }
@@ -1,6 +1,6 @@
 {
  "name": "@opencode-ai/app",
-  "version": "1.17.4",
+  "version": "1.17.9",
  "description": "",
  "type": "module",
  "exports": {
@@ -17,13 +17,15 @@
    "dev": "vite",
    "build": "vite build",
    "serve": "vite preview",
-    "test": "bun run test:unit",
+    "test": "bun run test:unit && bun run test:virtualizer",
    "test:unit": "bun test --only-failures --preload ./happydom.ts ./src",
+    "test:virtualizer": "bun test --conditions=browser --preload ./happydom.ts ./test-browser/solid-virtual.test.ts",
    "test:unit:watch": "bun test --watch --preload ./happydom.ts ./src",
    "test:e2e": "playwright test",
    "test:e2e:local": "playwright test",
    "test:e2e:ui": "playwright test --ui",
-    "test:e2e:report": "playwright show-report e2e/playwright-report"
+    "test:e2e:report": "playwright show-report e2e/playwright-report",
+    "test:bench": "bun test ./e2e/performance/unit && playwright test --config e2e/performance/playwright.config.ts"
  },
  "license": "MIT",
  "devDependencies": {
@@ -46,6 +48,7 @@
    "@opencode-ai/core": "workspace:*",
    "@opencode-ai/sdk": "workspace:*",
    "@opencode-ai/ui": "workspace:*",
+    "@pierre/trees": "1.0.0-beta.4",
    "@sentry/solid": "catalog:",
    "@shikijs/transformers": "3.9.2",
    "@solid-primitives/active-element": "2.1.3",
@@ -63,6 +66,7 @@
    "@solidjs/meta": "catalog:",
    "@solidjs/router": "catalog:",
    "@tanstack/solid-query": "5.91.4",
+    "@tanstack/solid-virtual": "catalog:",
    "@thisbeyond/solid-dnd": "0.7.5",
    "diff": "catalog:",
    "effect": "catalog:",
@@ -75,7 +79,6 @@
    "shiki": "catalog:",
    "solid-js": "catalog:",
    "solid-list": "catalog:",
-    "tailwindcss": "catalog:",
-    "virtua": "catalog:"
+    "tailwindcss": "catalog:"
  }
 }
@@ -9,6 +9,7 @@ const reuse = !process.env.CI
 const workers = Number(process.env.PLAYWRIGHT_WORKERS ?? (process.env.CI ? 5 : 0)) || undefined
 export default defineConfig({
  testDir: "./e2e",
+  testIgnore: process.env.OPENCODE_PERFORMANCE === "1" ? "performance/**/*.test.ts" : "performance/**",
  outputDir: "./e2e/test-results",
  timeout: 60_000,
  expect: {
@@ -69,8 +69,8 @@ const SessionRoute = Object.assign(
    createEffect(() => {
      if (!settings.general.newLayoutDesigns()) return
      if (params.id || search.draftId) return
-      if (!tabs.ready() || !sdk.directory) return
-      tabs.newDraft({ server: server.key, directory: sdk.directory }, search.prompt)
+      if (!tabs.ready() || !sdk().directory) return
+      tabs.newDraft({ server: server.key, directory: sdk().directory }, search.prompt)
    })

    return (
@@ -82,6 +82,45 @@ const SessionRoute = Object.assign(
  { preload: Session.preload },
 )

+// Wraps the non-draft routes. They are gated on (and keyed to) the globally selected
+// server via ServerKey, then provide the server-scoped shell (Permission/Layout/
+// Notification/Models + the visual Layout) for that server.
+function SelectedServerLayout(props: ParentProps) {
+  return (
+    <ServerKey>
+      <ServerSDKProvider>
+        <ServerSyncProvider>
+          <ServerScopedShell>{props.children}</ServerScopedShell>
+        </ServerSyncProvider>
+      </ServerSDKProvider>
+    </ServerKey>
+  )
+}
+
+// Wraps /new-session. It resolves the draft's target server and provides the
+// server-scoped shell for that server — without ServerKey, so the page never depends
+// on the globally "selected" server.
+function DraftServerLayout(props: ParentProps) {
+  const server = useServer()
+  const tabs = useTabs()
+  const [search] = useSearchParams<{ draftId?: string }>()
+  const conn = createMemo(() => {
+    const id = search.draftId
+    if (!id) return undefined
+    const draft = tabs.store.find((tab): tab is DraftTab => tab.type === "draft" && tab.draftID === id)
+    if (!draft) return undefined
+    return server.list.find((c) => ServerConnection.key(c) === draft.server)
+  })
+
+  return (
+    <ServerSDKProvider server={conn}>
+      <ServerSyncProvider server={conn}>
+        <ServerScopedShell>{props.children}</ServerScopedShell>
+      </ServerSyncProvider>
+    </ServerSDKProvider>
+  )
+}
+
 function DraftRoute() {
  const [search] = useSearchParams<{ draftId?: string }>()
  const tabs = useTabs()
@@ -95,19 +134,15 @@ function DraftRoute() {
 }

 function ResolvedDraftRoute(props: { draftID: string }) {
-  const server = useServer()
  const tabs = useTabs()
  const draft = createMemo(() =>
    tabs.store.find((tab): tab is DraftTab => tab.type === "draft" && tab.draftID === props.draftID),
  )

-  createEffect(() => {
-    const current = draft()
-    if (current && current.server !== server.key) server.setActive(current.server)
-  })
-
  // Key on the directory so retargeting the draft's project re-instantiates the
-  // SDK/data providers for the new directory while keeping the same draft id.
+  // directory-scoped providers while keeping the same draft id. The draft's target
+  // server is provided by DraftServerLayout, so changing only the server updates the
+  // SDK/sync hooks without remounting the composer.
  const directory = () => draft()?.directory

  return (
@@ -171,27 +206,36 @@ function BodyDesignClass() {
  return null
 }

-function AppShellProviders(props: ParentProps) {
+// Server-agnostic providers shared across every route. These live in the shared
+// shell (router root) so they stay mounted regardless of the active server/route.
+function SharedProviders(props: ParentProps) {
  return (
    <SettingsProvider>
      <BodyDesignClass />
-      <PermissionProvider>
-        <LayoutProvider>
-          <NotificationProvider>
-            <ModelsProvider>
-              <CommandProvider>
-                <HighlightsProvider>
-                  <Layout>{props.children}</Layout>
-                </HighlightsProvider>
-              </CommandProvider>
-            </ModelsProvider>
-          </NotificationProvider>
-        </LayoutProvider>
-      </PermissionProvider>
+      <CommandProvider>
+        <HighlightsProvider>{props.children}</HighlightsProvider>
+      </CommandProvider>
    </SettingsProvider>
  )
 }

+// Server-scoped providers plus the visual Layout (tabs/sidebar). These live inside
+// each per-route server layout so they resolve to that route's server (selected vs
+// draft). The Layout remounts when crossing between those groups.
+function ServerScopedShell(props: ParentProps) {
+  return (
+    <PermissionProvider>
+      <LayoutProvider>
+        <NotificationProvider>
+          <ModelsProvider>
+            <Layout>{props.children}</Layout>
+          </ModelsProvider>
+        </NotificationProvider>
+      </LayoutProvider>
+    </PermissionProvider>
+  )
+}
+
 function SessionProviders(props: ParentProps) {
  return (
    <TerminalProvider>
@@ -216,17 +260,6 @@ function DraftProviders(props: ParentProps) {
  )
 }

-function RouterRoot(props: ParentProps<{ appChildren?: JSX.Element }>) {
-  return (
-    <AppShellProviders>
-      {/*<Suspense fallback={<Loading />}>*/}
-      {props.appChildren}
-      {props.children}
-      {/*</Suspense>*/}
-    </AppShellProviders>
-  )
-}
-
 export function AppBaseProviders(props: ParentProps<{ locale?: Locale }>) {
  return (
    <MetaProvider>
@@ -385,6 +418,20 @@ export function AppInterface(props: {
  router?: Component<BaseRouterProps>
  disableHealthCheck?: boolean
 }) {
+  // The shared shell holds only server-agnostic providers (QueryClient + Settings/
+  // Command/Highlights) and stays mounted across every route. The server-scoped
+  // providers and the visual Layout live in the per-route layouts below, so they
+  // resolve to that route's server (selected for most routes, the draft's server for
+  // /new-session). appChildren is server-agnostic, so it renders here once.
+  const ServerShell = (shellProps: ParentProps) => (
+    <QueryProvider>
+      <SharedProviders>
+        {props.children}
+        {shellProps.children}
+      </SharedProviders>
+    </QueryProvider>
+  )
+
  return (
    <ServerProvider
      defaultServer={props.defaultServer}
@@ -397,23 +444,19 @@ export function AppInterface(props: {
            component={props.router ?? Router}
            root={(routerProps) => (
              <TabsProvider>
-                <ServerKey>
-                  <QueryProvider>
-                    <ServerSDKProvider>
-                      <ServerSyncProvider>
-                        <RouterRoot appChildren={props.children}>{routerProps.children}</RouterRoot>
-                      </ServerSyncProvider>
-                    </ServerSDKProvider>
-                  </QueryProvider>
-                </ServerKey>
+                <ServerShell>{routerProps.children}</ServerShell>
              </TabsProvider>
            )}
          >
-            <Route path="/" component={HomeRoute} />
-            <Route path="/new-session" component={DraftRoute} />
-            <Route path="/:dir" component={DirectoryLayout}>
-              <Route path="/" component={() => <Navigate href="session" />} />
-              <Route path="/session/:id?" component={SessionRoute} />
+            <Route component={SelectedServerLayout}>
+              <Route path="/" component={HomeRoute} />
+              <Route path="/:dir" component={DirectoryLayout}>
+                <Route path="/" component={() => <Navigate href="session" />} />
+                <Route path="/session/:id?" component={SessionRoute} />
+              </Route>
+            </Route>
+            <Route component={DraftServerLayout}>
+              <Route path="/new-session" component={DraftRoute} />
            </Route>
          </Dynamic>
        </ConnectionGate>
@@ -41,7 +41,7 @@ export function DialogConnectProvider(props: { provider: string }) {
  })

  const provider = createMemo(
-    () => providers.all().get(props.provider) ?? serverSync.data.provider.all.get(props.provider)!,
+    () => providers.all().get(props.provider) ?? serverSync().data.provider.all.get(props.provider)!,
  )
  const fallback = createMemo<ProviderAuthMethod[]>(() => [
    {
@@ -52,16 +52,16 @@ export function DialogConnectProvider(props: { provider: string }) {
  const [auth] = createResource(
    () => props.provider,
    async () => {
-      const cached = serverSync.data.provider_auth[props.provider]
+      const cached = serverSync().data.provider_auth[props.provider]
      if (cached) return cached
-      const res = await serverSDK.client.provider.auth()
+      const res = await serverSDK().client.provider.auth()
      if (!alive.value) return fallback()
-      serverSync.set("provider_auth", res.data ?? {})
+      serverSync().set("provider_auth", res.data ?? {})
      return res.data?.[props.provider] ?? fallback()
    },
  )
-  const loading = createMemo(() => auth.loading && !serverSync.data.provider_auth[props.provider])
-  const methods = createMemo(() => auth.latest ?? serverSync.data.provider_auth[props.provider] ?? fallback())
+  const loading = createMemo(() => auth.loading && !serverSync().data.provider_auth[props.provider])
+  const methods = createMemo(() => auth.latest ?? serverSync().data.provider_auth[props.provider] ?? fallback())
  const [store, setStore] = createStore({
    methodIndex: undefined as undefined | number,
    authorization: undefined as undefined | ProviderAuthAuthorization,
@@ -158,8 +158,8 @@ export function DialogConnectProvider(props: { provider: string }) {
      }
      dispatch({ type: "auth.pending" })
      const start = Date.now()
-      await serverSDK.client.provider.oauth
-        .authorize(
+      await serverSDK()
+        .client.provider.oauth.authorize(
          {
            providerID: props.provider,
            method: index,
@@ -331,7 +331,7 @@ export function DialogConnectProvider(props: { provider: string }) {
  })

  async function complete() {
-    await serverSDK.client.global.dispose()
+    await serverSDK().client.global.dispose()
    dialog.close()
    showToast({
      variant: "success",
@@ -409,7 +409,7 @@ export function DialogConnectProvider(props: { provider: string }) {
      }

      setFormStore("error", undefined)
-      await serverSDK.client.auth.set({
+      await serverSDK().client.auth.set({
        providerID: props.provider,
        auth: {
          type: "api",
@@ -480,8 +480,8 @@ export function DialogConnectProvider(props: { provider: string }) {
      }

      setFormStore("error", undefined)
-      const result = await serverSDK.client.provider.oauth
-        .callback({
+      const result = await serverSDK()
+        .client.provider.oauth.callback({
          providerID: props.provider,
          method: store.methodIndex,
          code,
@@ -533,8 +533,8 @@ export function DialogConnectProvider(props: { provider: string }) {

    onMount(() => {
      void (async () => {
-        const result = await serverSDK.client.provider.oauth
-          .callback({
+        const result = await serverSDK()
+          .client.provider.oauth.callback({
            providerID: props.provider,
            method: store.methodIndex,
          })
@@ -105,8 +105,8 @@ export function DialogCustomProvider(props: Props) {
    const output = validateCustomProvider({
      form,
      t: language.t,
-      disabledProviders: serverSync.data.config.disabled_providers ?? [],
-      existingProviderIDs: new Set(serverSync.data.provider.all.keys()),
+      disabledProviders: serverSync().data.config.disabled_providers ?? [],
+      existingProviderIDs: new Set(serverSync().data.provider.all.keys()),
    })
    batch(() => {
      setForm("err", output.err)
@@ -118,11 +118,11 @@ export function DialogCustomProvider(props: Props) {

  const saveMutation = useMutation(() => ({
    mutationFn: async (result: NonNullable<ReturnType<typeof validate>>) => {
-      const disabledProviders = serverSync.data.config.disabled_providers ?? []
+      const disabledProviders = serverSync().data.config.disabled_providers ?? []
      const nextDisabled = disabledProviders.filter((id) => id !== result.providerID)

      if (result.key) {
-        await serverSDK.client.auth.set({
+        await serverSDK().client.auth.set({
          providerID: result.providerID,
          auth: {
            type: "api",
@@ -131,7 +131,7 @@ export function DialogCustomProvider(props: Props) {
        })
      }

-      await serverSync.updateConfig({
+      await serverSync().updateConfig({
        provider: { [result.providerID]: result.config },
        disabled_providers: nextDisabled,
      })
@@ -35,13 +35,13 @@ export const DialogFork: Component = () => {
    const sessionID = params.id
    if (!sessionID) return []

-    const msgs = sync.data.message[sessionID] ?? []
+    const msgs = sync().data.message[sessionID] ?? []
    const result: ForkableMessage[] = []

    for (const message of msgs) {
      if (message.role !== "user") continue

-      const parts = sync.data.part[message.id] ?? []
+      const parts = sync().data.part[message.id] ?? []
      const textPart = parts.find((x): x is SDKTextPart => x.type === "text" && !x.synthetic && !x.ignored)
      if (!textPart) continue

@@ -61,15 +61,15 @@ export const DialogFork: Component = () => {
    const sessionID = params.id
    if (!sessionID) return

-    const parts = sync.data.part[item.id] ?? []
+    const parts = sync().data.part[item.id] ?? []
    const restored = extractPromptFromParts(parts, {
-      directory: sdk.directory,
+      directory: sdk().directory,
      attachmentName: language.t("common.attachment"),
    })
-    const dir = base64Encode(sdk.directory)
+    const dir = base64Encode(sdk().directory)

-    sdk.client.session
-      .fork({ sessionID, messageID: item.id })
+    sdk()
+      .client.session.fork({ sessionID, messageID: item.id })
      .then((forked) => {
        if (!forked.data) {
          showToast({ title: language.t("common.requestFailed") })
@@ -0,0 +1,107 @@
+.directory-picker-v2-body {
+  display: flex;
+  min-height: 0;
+  flex: 1;
+  flex-direction: column;
+  gap: 12px;
+  padding: 2px 16px 0;
+}
+
+.directory-picker-v2-path {
+  position: relative;
+  z-index: 10;
+  display: flex;
+  gap: 8px;
+}
+
+.directory-picker-v2-actions {
+  display: flex;
+  flex-shrink: 0;
+  gap: 2px;
+}
+
+.directory-picker-v2-suggestions {
+  position: absolute;
+  z-index: 20;
+  top: 36px;
+  right: 0;
+  left: 0;
+  display: flex;
+  flex-direction: column;
+  padding: 4px;
+  border: 1px solid var(--v2-border-border-base);
+  border-radius: 6px;
+  background: var(--v2-background-bg-layer-02);
+  box-shadow: var(--v2-elevation-overlay);
+}
+
+.directory-picker-v2-suggestions button {
+  overflow: hidden;
+  padding: 6px 8px;
+  border-radius: 4px;
+  color: var(--v2-text-text-muted);
+  font-size: 12px;
+  text-align: left;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.directory-picker-v2-suggestions button:hover,
+.directory-picker-v2-suggestions button[data-active] {
+  color: var(--v2-text-text-base);
+  background: var(--v2-overlay-simple-overlay-hover);
+}
+
+.directory-picker-v2-browser {
+  position: relative;
+  z-index: 0;
+  isolation: isolate;
+  min-height: 0;
+  flex: 1;
+  overflow: auto;
+  border: 1px solid var(--v2-border-border-base);
+  border-radius: 6px;
+  background: transparent;
+}
+
+.directory-picker-v2-tree {
+  display: block;
+  width: 100%;
+  height: 100%;
+  --trees-bg-override: transparent;
+  --trees-fg-override: var(--v2-text-text-base);
+  --trees-fg-muted-override: var(--v2-text-text-muted);
+  --trees-bg-muted-override: transparent;
+  --trees-selected-bg-override: transparent;
+  --trees-selected-fg-override: var(--v2-text-text-base);
+  --trees-selected-focused-border-color-override: transparent;
+  --trees-focus-ring-color-override: transparent;
+  --trees-focus-ring-width-override: 0px;
+  --trees-focus-ring-offset-override: 0px;
+  --trees-border-color-override: var(--v2-border-border-base);
+  --trees-font-family-override: var(--font-family-sans);
+  --trees-font-size-override: 12px;
+  --trees-item-height: 24px;
+  --trees-border-radius-override: 4px;
+}
+
+.directory-picker-v2-state {
+  position: absolute;
+  z-index: 1;
+  inset: 0;
+  display: grid;
+  place-items: center;
+  color: var(--v2-text-text-muted);
+  font-size: 12px;
+  pointer-events: none;
+}
+
+.directory-picker-v2-selection {
+  overflow: hidden;
+  flex-shrink: 0;
+  color: var(--v2-text-text-muted);
+  font-size: 12px;
+  line-height: 16px;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
@@ -0,0 +1,356 @@
+import "@pierre/trees/web-components"
+import { FileTree } from "@pierre/trees"
+import { Dialog, DialogFooter } from "@opencode-ai/ui/v2/dialog-v2"
+import { ButtonV2 } from "@opencode-ai/ui/v2/button-v2"
+import { TextInputV2 } from "@opencode-ai/ui/v2/text-input-v2"
+import { useDialog } from "@opencode-ai/ui/context/dialog"
+import { createEffect, createMemo, createResource, createSignal, For, onCleanup, onMount, Show } from "solid-js"
+import { useGlobal } from "@/context/global"
+import { useLanguage } from "@/context/language"
+import { ServerConnection } from "@/context/server"
+import {
+  absoluteTreePath,
+  activeTreeNavigation,
+  advanceTreePreload,
+  nextSuggestionIndex,
+  nextTreeScrollTop,
+  pickerFileSearchQuery,
+  pickerAbsoluteInput,
+  pickerMode,
+  preloadTreeDirectories,
+  cleanPickerInput,
+  createDirectorySearch,
+  currentPickerSuggestions,
+  displayPickerPath,
+  pickerParent,
+  pickerRoot,
+} from "./directory-picker-domain"
+import "./dialog-select-directory-v2.css"
+
+interface DialogSelectDirectoryV2Props {
+  title?: string
+  multiple?: boolean
+  onSelect: (result: string | string[] | null) => void
+  server: ServerConnection.Any
+  mode?: "directory" | "file"
+  start?: string
+}
+
+export function DialogSelectDirectoryV2(props: DialogSelectDirectoryV2Props) {
+  const global = useGlobal()
+  const { sync, sdk } = global.createServerCtx(props.server)
+  const dialog = useDialog()
+  const language = useLanguage()
+  const policy = pickerMode(props.mode ?? "directory", props.start)
+  const action = {
+    file: language.t("dialog.directory.action.selectFile"),
+    directory: language.t("dialog.directory.action.selectFolder"),
+  }
+  const [root, setRoot] = createSignal("")
+  const [input, setInput] = createSignal("")
+  const [selected, setSelected] = createSignal("")
+  const [suggestionsOpen, setSuggestionsOpen] = createSignal(false)
+  const [activeSuggestion, setActiveSuggestion] = createSignal(-1)
+  const [loading, setLoading] = createSignal(false)
+  const [error, setError] = createSignal(false)
+  const [rootValid, setRootValid] = createSignal(false)
+  const listings = new Map<string, Promise<Array<{ name: string; type: "file" | "directory" }> | undefined>>()
+  const advanced = new Set<string>()
+  let tree: FileTree | undefined
+  let container: HTMLDivElement | undefined
+  let pathArea: HTMLDivElement | undefined
+  let navigation = 0
+
+  const missingBase = createMemo(() => !(sync.data.path.home || sync.data.path.directory))
+  const [fallbackPath] = createResource(
+    () => (missingBase() ? true : undefined),
+    () =>
+      sdk.client.path
+        .get()
+        .then((result) => result.data)
+        .catch(() => undefined),
+    { initialValue: undefined },
+  )
+  const home = createMemo(() => sync.data.path.home || fallbackPath()?.home || "")
+  const start = createMemo(
+    () =>
+      props.start ||
+      sync.data.path.home ||
+      sync.data.path.directory ||
+      fallbackPath()?.home ||
+      fallbackPath()?.directory,
+  )
+  const search = createDirectorySearch({ sdk, home, base: () => root() || start() })
+  const [suggestions] = createResource(input, async (value) => {
+    const typed = cleanPickerInput(value).replace(/\/+$/, "")
+    const current = displayPickerPath(root(), value, home()).replace(/\/+$/, "")
+    if (!typed || typed === current) return { query: value, items: [] }
+    const directories = (await search(value)).map((absolute) => ({ absolute, type: "directory" as const }))
+    if (!policy.includeFiles) return { query: value, items: directories.slice(0, 5) }
+    const files = await sdk.client.find
+      .files({ directory: root(), query: pickerFileSearchQuery(root(), value, home()), type: "file", limit: 20 })
+      .then((result) => result.data ?? [])
+      .catch(() => [])
+    const results = [
+      ...directories,
+      ...files.map((path) => ({ absolute: absoluteTreePath(root(), path), type: "file" as const })),
+    ]
+    return {
+      query: value,
+      items: Array.from(new Map(results.map((result) => [result.absolute, result])).values()).slice(0, 8),
+    }
+  })
+  const currentSuggestions = createMemo(() => currentPickerSuggestions(suggestions(), input()))
+
+  async function load(path: string, generation: number, preload = true) {
+    const key = path.replace(/\/+$/, "")
+    setError(false)
+    const absolute = absoluteTreePath(root(), key)
+    const request =
+      listings.get(key) ??
+      sdk.client.file
+        .list({ directory: absolute, path: "" })
+        .then((result) => result.data ?? [])
+        .catch(() => undefined)
+    listings.set(key, request)
+    const nodes = await request
+    if (!activeTreeNavigation(generation, navigation)) return false
+    if (!nodes) {
+      listings.delete(key)
+      if (!key) setError(true)
+      return false
+    }
+    tree?.batch(policy.entries(key, nodes).map((item) => ({ type: "add", path: item })))
+    if (preload && advanceTreePreload(advanced, key)) {
+      void Promise.all(preloadTreeDirectories(key, nodes).map((directory) => load(directory, generation, false)))
+    }
+    return true
+  }
+
+  async function navigate(path: string) {
+    const value = policy.navigation(pickerAbsoluteInput(cleanPickerInput(path), home(), root() || start() || home()))
+    if (!value) return
+    const token = ++navigation
+    setLoading(true)
+    setRootValid(false)
+    setSelected("")
+    setSuggestionsOpen(false)
+    setActiveSuggestion(-1)
+    setRoot(value)
+    setInput(displayPickerPath(value, value, home()))
+    listings.clear()
+    advanced.clear()
+    tree?.resetPaths([])
+    const valid = await load("", token)
+    if (!activeTreeNavigation(token, navigation)) return
+    setRootValid(valid)
+    setLoading(false)
+  }
+
+  function complete() {
+    const items = currentSuggestions()
+    const match = items[activeSuggestion()] ?? items[0]
+    if (!match) return
+    const value = displayPickerPath(match.absolute, input(), home())
+    setInput(match.type === "directory" && !value.endsWith("/") ? value + "/" : value)
+    if (match.type === "file") {
+      setSelected(policy.selection(root(), pickerFileSearchQuery(root(), match.absolute, home())) ?? "")
+      setSuggestionsOpen(false)
+      setActiveSuggestion(-1)
+    }
+  }
+
+  function chooseSuggestion(suggestion: { absolute: string; type: "file" | "directory" }) {
+    if (suggestion.type === "directory") {
+      void navigate(suggestion.absolute)
+      return
+    }
+    setInput(displayPickerPath(suggestion.absolute, input(), home()))
+    setSelected(policy.selection(root(), pickerFileSearchQuery(root(), suggestion.absolute, home())) ?? "")
+    setSuggestionsOpen(false)
+    setActiveSuggestion(-1)
+  }
+
+  function moveSuggestion(delta: -1 | 1) {
+    setSuggestionsOpen(true)
+    setActiveSuggestion((current) => nextSuggestionIndex(current, delta, currentSuggestions().length))
+  }
+
+  function activeSuggestionValue() {
+    const items = currentSuggestions()
+    return items[activeSuggestion()] ?? items[0]
+  }
+
+  const keyActions: Partial<Record<string, () => void>> = {
+    ArrowDown: () => moveSuggestion(1),
+    ArrowUp: () => moveSuggestion(-1),
+    Enter: () => {
+      const suggestion = activeSuggestionValue()
+      if (suggestion) chooseSuggestion(suggestion)
+      if (!suggestion) void navigate(input())
+    },
+    Tab: complete,
+  }
+
+  function handleInputKey(event: KeyboardEvent) {
+    const action = keyActions[event.key]
+    if (!action) return
+    if (event.key === "Tab" && event.shiftKey) return
+    event.preventDefault()
+    action()
+  }
+
+  function resolve() {
+    const path = policy.result(root(), selected(), rootValid())
+    if (!path) return
+    props.onSelect(props.multiple ? [path] : path)
+    dialog.close()
+  }
+
+  onMount(() => {
+    const closeSuggestions = (event: PointerEvent) => {
+      if (pathArea?.contains(event.target as Node)) return
+      setSuggestionsOpen(false)
+      setActiveSuggestion(-1)
+    }
+    document.addEventListener("pointerdown", closeSuggestions)
+    onCleanup(() => document.removeEventListener("pointerdown", closeSuggestions))
+    tree = new FileTree({
+      paths: [],
+      flattenEmptyDirectories: false,
+      initialExpansion: "closed",
+      stickyFolders: true,
+      unsafeCSS: `
+        button[data-type="item"] {
+          background: transparent !important;
+          box-shadow: none !important;
+        }
+        button[data-type="item"]:hover {
+          background: var(--v2-overlay-simple-overlay-hover) !important;
+        }
+        button[data-type="item"]:focus-visible {
+          outline: none !important;
+          box-shadow: none !important;
+        }
+        [data-file-tree-virtualized-scroll] {
+          overscroll-behavior: contain;
+          scrollbar-width: thin;
+        }
+      `,
+      onExpansionChange(change) {
+        if (change.expanded) void load(change.path, navigation)
+      },
+      onSelectionChange(paths) {
+        const path = paths.at(-1)
+        setSelected(path ? (policy.selection(root(), path) ?? "") : "")
+      },
+    })
+    if (!container) return
+    tree.render({ containerWrapper: container })
+    tree.getFileTreeContainer()?.classList.add("directory-picker-v2-tree")
+  })
+
+  createEffect(() => {
+    const path = start()
+    if (!path || root()) return
+    void navigate(path)
+  })
+
+  onCleanup(() => tree?.cleanUp())
+
+  return (
+    <Dialog title={props.title ?? language.t("command.project.open")} size="large" class="directory-picker-v2">
+      <div class="directory-picker-v2-body">
+        <div class="directory-picker-v2-path" ref={pathArea}>
+          <TextInputV2
+            value={input()}
+            autofocus
+            autocomplete="off"
+            spellcheck={false}
+            class="!w-full"
+            onInput={(event) => {
+              setInput(cleanPickerInput(event.currentTarget.value))
+              setSelected("")
+              setSuggestionsOpen(true)
+              setActiveSuggestion(-1)
+            }}
+            role="combobox"
+            aria-autocomplete="list"
+            aria-expanded={suggestionsOpen()}
+            aria-controls="directory-picker-v2-suggestions"
+            aria-activedescendant={
+              activeSuggestion() >= 0 ? `directory-picker-v2-suggestion-${activeSuggestion()}` : undefined
+            }
+            onKeyDown={handleInputKey}
+          />
+          <div class="directory-picker-v2-actions">
+            <ButtonV2 size="small" variant="ghost" onClick={() => void navigate(home())}>
+              ~
+            </ButtonV2>
+            <ButtonV2 size="small" variant="ghost" onClick={() => void navigate(pickerRoot(root()) || root())}>
+              {language.t("dialog.directory.root")}
+            </ButtonV2>
+            <ButtonV2 size="small" variant="ghost" onClick={() => void navigate(pickerParent(root()))}>
+              {language.t("dialog.directory.parent")}
+            </ButtonV2>
+          </div>
+          <Show when={suggestionsOpen() && currentSuggestions().length > 0}>
+            <div id="directory-picker-v2-suggestions" role="listbox" class="directory-picker-v2-suggestions">
+              <For each={currentSuggestions()}>
+                {(suggestion, index) => (
+                  <button
+                    id={`directory-picker-v2-suggestion-${index()}`}
+                    role="option"
+                    aria-selected={index() === activeSuggestion()}
+                    data-active={index() === activeSuggestion() ? "" : undefined}
+                    onPointerMove={() => setActiveSuggestion(index())}
+                    onClick={() => chooseSuggestion(suggestion)}
+                  >
+                    {displayPickerPath(suggestion.absolute, input(), home())}
+                    {suggestion.type === "directory" ? "/" : ""}
+                  </button>
+                )}
+              </For>
+            </div>
+          </Show>
+        </div>
+        <div
+          class="directory-picker-v2-browser"
+          ref={container}
+          onWheel={(event) => {
+            const scroller = tree
+              ?.getFileTreeContainer()
+              ?.shadowRoot?.querySelector<HTMLElement>("[data-file-tree-virtualized-scroll]")
+            if (!scroller) return
+            const next = nextTreeScrollTop(
+              scroller.scrollTop,
+              event.deltaY,
+              scroller.scrollHeight,
+              scroller.clientHeight,
+            )
+            if (next === scroller.scrollTop) return
+            event.preventDefault()
+            scroller.scrollTop = next
+            scroller.dispatchEvent(new Event("scroll"))
+          }}
+        >
+          <Show when={loading()}>
+            <div class="directory-picker-v2-state">{language.t("common.loading")}</div>
+          </Show>
+          <Show when={!loading() && error()}>
+            <div class="directory-picker-v2-state">{language.t("dialog.directory.readError")}</div>
+          </Show>
+        </div>
+        <div class="directory-picker-v2-selection">{policy.result(root(), selected(), rootValid())}</div>
+      </div>
+      <DialogFooter>
+        <ButtonV2 variant="neutral" onClick={() => dialog.close()}>
+          {language.t("common.cancel")}
+        </ButtonV2>
+        <ButtonV2 variant="contrast" disabled={!policy.result(root(), selected(), rootValid())} onClick={resolve}>
+          {action[policy.action]}
+        </ButtonV2>
+      </DialogFooter>
+    </Dialog>
+  )
+}
@@ -4,12 +4,11 @@ import { FileIcon } from "@opencode-ai/ui/file-icon"
 import { List } from "@opencode-ai/ui/list"
 import type { ListRef } from "@opencode-ai/ui/list"
 import { getDirectory, getFilename } from "@opencode-ai/core/util/path"
-import fuzzysort from "fuzzysort"
 import { createMemo, createResource, createSignal } from "solid-js"
-import { ServerSDK } from "@/context/server-sdk"
 import { useLanguage } from "@/context/language"
 import { ServerConnection } from "@/context/server"
 import { useGlobal } from "@/context/global"
+import { cleanPickerInput, createDirectorySearch, displayPickerPath } from "./directory-picker-domain"

 interface DialogSelectDirectoryProps {
  title?: string
@@ -24,89 +23,9 @@ type Row = {
  group: "recent" | "folders"
 }

-function cleanInput(value: string) {
-  const first = (value ?? "").split(/\r?\n/)[0] ?? ""
-  return first.replace(/[\u0000-\u001F\u007F]/g, "").trim()
-}
-
-function normalizePath(input: string) {
-  const v = input.replaceAll("\\", "/")
-  if (v.startsWith("//") && !v.startsWith("///")) return "//" + v.slice(2).replace(/\/+/g, "/")
-  return v.replace(/\/+/g, "/")
-}
-
-function normalizeDriveRoot(input: string) {
-  const v = normalizePath(input)
-  if (/^[A-Za-z]:$/.test(v)) return v + "/"
-  return v
-}
-
-function trimTrailing(input: string) {
-  const v = normalizeDriveRoot(input)
-  if (v === "/") return v
-  if (v === "//") return v
-  if (/^[A-Za-z]:\/$/.test(v)) return v
-  return v.replace(/\/+$/, "")
-}
-
-function joinPath(base: string | undefined, rel: string) {
-  const b = trimTrailing(base ?? "")
-  const r = trimTrailing(rel).replace(/^\/+/, "")
-  if (!b) return r
-  if (!r) return b
-  if (b.endsWith("/")) return b + r
-  return b + "/" + r
-}
-
-function rootOf(input: string) {
-  const v = normalizeDriveRoot(input)
-  if (v.startsWith("//")) return "//"
-  if (v.startsWith("/")) return "/"
-  if (/^[A-Za-z]:\//.test(v)) return v.slice(0, 3)
-  return ""
-}
-
-function parentOf(input: string) {
-  const v = trimTrailing(input)
-  if (v === "/") return v
-  if (v === "//") return v
-  if (/^[A-Za-z]:\/$/.test(v)) return v
-
-  const i = v.lastIndexOf("/")
-  if (i <= 0) return "/"
-  if (i === 2 && /^[A-Za-z]:/.test(v)) return v.slice(0, 3)
-  return v.slice(0, i)
-}
-
-function modeOf(input: string) {
-  const raw = normalizeDriveRoot(input.trim())
-  if (!raw) return "relative" as const
-  if (raw.startsWith("~")) return "tilde" as const
-  if (rootOf(raw)) return "absolute" as const
-  return "relative" as const
-}
-
-function tildeOf(absolute: string, home: string) {
-  const full = trimTrailing(absolute)
-  if (!home) return ""
-
-  const hn = trimTrailing(home)
-  const lc = full.toLowerCase()
-  const hc = hn.toLowerCase()
-  if (lc === hc) return "~"
-  if (lc.startsWith(hc + "/")) return "~" + full.slice(hn.length)
-  return ""
-}
-
-function displayPath(path: string, input: string, home: string) {
-  const full = trimTrailing(path)
-  if (modeOf(input) === "absolute") return full
-  return tildeOf(full, home) || full
-}
-
 function toRow(absolute: string, home: string, group: Row["group"]): Row {
-  const full = trimTrailing(absolute)
-  const tilde = tildeOf(full, home)
+  const full = displayPickerPath(absolute, "", "")
+  const tilde = displayPickerPath(full, "~", home)
  const withSlash = (value: string) => {
    if (!value) return ""
    if (value.endsWith("/")) return value
@@ -128,120 +47,6 @@ function uniqueRows(rows: Row[]) {
  })
 }

-function useDirectorySearch(args: { sdk: ServerSDK; start: () => string | undefined; home: () => string }) {
-  const cache = new Map<string, Promise<Array<{ name: string; absolute: string }>>>()
-  let current = 0
-
-  const scoped = (value: string) => {
-    const base = args.start()
-    if (!base) return
-
-    const raw = normalizeDriveRoot(value)
-    if (!raw) return { directory: trimTrailing(base), path: "" }
-
-    const h = args.home()
-    if (raw === "~") return { directory: trimTrailing(h || base), path: "" }
-    if (raw.startsWith("~/")) return { directory: trimTrailing(h || base), path: raw.slice(2) }
-
-    const root = rootOf(raw)
-    if (root) return { directory: trimTrailing(root), path: raw.slice(root.length) }
-    return { directory: trimTrailing(base), path: raw }
-  }
-
-  const dirs = async (dir: string) => {
-    const key = trimTrailing(dir)
-    const existing = cache.get(key)
-    if (existing) return existing
-
-    const request = args.sdk.client.file
-      .list({ directory: key, path: "" })
-      .then((x) => x.data ?? [])
-      .catch(() => [])
-      .then((nodes) =>
-        nodes
-          .filter((n) => n.type === "directory")
-          .map((n) => ({
-            name: n.name,
-            absolute: trimTrailing(normalizeDriveRoot(n.absolute)),
-          })),
-      )
-
-    cache.set(key, request)
-    return request
-  }
-
-  const match = async (dir: string, query: string, limit: number) => {
-    const items = await dirs(dir)
-    if (!query) return items.slice(0, limit).map((x) => x.absolute)
-    return fuzzysort.go(query, items, { key: "name", limit }).map((x) => x.obj.absolute)
-  }
-
-  return async (filter: string) => {
-    const token = ++current
-    const active = () => token === current
-
-    const value = cleanInput(filter)
-    const scopedInput = scoped(value)
-    if (!scopedInput) return [] as string[]
-
-    const raw = normalizeDriveRoot(value)
-    const isPath = raw.startsWith("~") || !!rootOf(raw) || raw.includes("/")
-    const query = normalizeDriveRoot(scopedInput.path)
-
-    const find = () =>
-      args.sdk.client.find
-        .files({ directory: scopedInput.directory, query, type: "directory", limit: 50 })
-        .then((x) => x.data ?? [])
-        .catch(() => [])
-
-    if (!isPath) {
-      const results = await find()
-      if (!active()) return []
-      return results.map((rel) => joinPath(scopedInput.directory, rel)).slice(0, 50)
-    }
-
-    const segments = query.replace(/^\/+/, "").split("/")
-    const head = segments.slice(0, segments.length - 1).filter((x) => x && x !== ".")
-    const tail = segments[segments.length - 1] ?? ""
-
-    const cap = 12
-    const branch = 4
-    let paths = [scopedInput.directory]
-    for (const part of head) {
-      if (!active()) return []
-      if (part === "..") {
-        paths = paths.map(parentOf)
-        continue
-      }
-
-      const next = (await Promise.all(paths.map((p) => match(p, part, branch)))).flat()
-      if (!active()) return []
-      paths = Array.from(new Set(next)).slice(0, cap)
-      if (paths.length === 0) return [] as string[]
-    }
-
-    const out = (await Promise.all(paths.map((p) => match(p, tail, 50)))).flat()
-    if (!active()) return []
-    const deduped = Array.from(new Set(out))
-    const base = raw.startsWith("~") ? trimTrailing(scopedInput.directory) : ""
-    const expand = !raw.endsWith("/")
-    if (!expand || !tail) {
-      const items = base ? Array.from(new Set([base, ...deduped])) : deduped
-      return items.slice(0, 50)
-    }
-
-    const needle = tail.toLowerCase()
-    const exact = deduped.filter((p) => getFilename(p).toLowerCase() === needle)
-    const target = exact[0]
-    if (!target) return deduped.slice(0, 50)
-
-    const children = await match(target, "", 30)
-    if (!active()) return []
-    const items = Array.from(new Set([...deduped, ...children]))
-    return (base ? Array.from(new Set([base, ...items])) : items).slice(0, 50)
-  }
-}
-
 export function DialogSelectDirectory(props: DialogSelectDirectoryProps) {
  const global = useGlobal()
  const { sync, sdk, ...serverCtx } = global.createServerCtx(props.server)
@@ -268,10 +73,10 @@ export function DialogSelectDirectory(props: DialogSelectDirectoryProps) {
    () => sync.data.path.home || sync.data.path.directory || fallbackPath()?.home || fallbackPath()?.directory,
  )

-  const directories = useDirectorySearch({
+  const directories = createDirectorySearch({
    sdk,
    home,
-    start,
+    base: start,
  })

  const recentProjects = createMemo(() => {
@@ -336,7 +141,7 @@ export function DialogSelectDirectory(props: DialogSelectDirectoryProps) {
          group.category === "recent" ? language.t("home.recentProjects") : language.t("command.project.open")
        }
        ref={(r) => (list = r)}
-        onFilter={(value) => setFilter(cleanInput(value))}
+        onFilter={(value) => setFilter(cleanPickerInput(value))}
        onKeyEvent={(e, item) => {
          if (e.key !== "Tab") return
          if (e.shiftKey) return
@@ -345,7 +150,7 @@ export function DialogSelectDirectory(props: DialogSelectDirectoryProps) {
          e.preventDefault()
          e.stopPropagation()

-          const value = displayPath(item.absolute, filter(), home())
+          const value = displayPickerPath(item.absolute, filter(), home())
          list?.setFilter(value.endsWith("/") ? value : value + "/")
        }}
        onSelect={(path) => {
@@ -354,7 +159,7 @@ export function DialogSelectDirectory(props: DialogSelectDirectoryProps) {
        }}
      >
        {(item) => {
-          const path = displayPath(item.absolute, filter(), home())
+          const path = displayPickerPath(item.absolute, filter(), home())
          if (path === "~") {
            return (
              <div class="w-full flex items-center justify-between rounded-md">
@@ -7,18 +7,25 @@ import { List } from "@opencode-ai/ui/list"
 import { base64Encode } from "@opencode-ai/core/util/encode"
 import { getDirectory, getFilename } from "@opencode-ai/core/util/path"
 import { useNavigate } from "@solidjs/router"
-import { createMemo, createSignal, Match, onCleanup, Show, Switch } from "solid-js"
+import { createMemo, createSignal, lazy, Match, onCleanup, Show, Switch } from "solid-js"
 import { formatKeybind, useCommand, type CommandOption } from "@/context/command"
-import { useServerSDK } from "@/context/server-sdk"
+import { useServerSDK, type ServerSDK } from "@/context/server-sdk"
 import { useServerSync } from "@/context/server-sync"
 import { useLayout } from "@/context/layout"
 import { useFile } from "@/context/file"
 import { useLanguage } from "@/context/language"
+import { usePlatform } from "@/context/platform"
+import { useServer } from "@/context/server"
+import { useSettings } from "@/context/settings"
 import { useSessionLayout } from "@/pages/session/session-layout"
 import { createSessionTabs } from "@/pages/session/helpers"
 import { decode64 } from "@/utils/base64"
 import { getRelativeTime } from "@/utils/time"

+const DialogSelectFileV2 = lazy(() =>
+  import("./dialog-select-directory-v2").then((module) => ({ default: module.DialogSelectDirectoryV2 })),
+)
+
 type EntryType = "command" | "file" | "session"

 type Entry = {
@@ -175,7 +182,7 @@ function createFileEntries(props: {
 function createSessionEntries(props: {
  workspaces: () => string[]
  label: (directory: string) => string
-  serverSDK: ReturnType<typeof useServerSDK>
+  serverSDK: ServerSDK
  language: ReturnType<typeof useLanguage>
 }) {
  const state: {
@@ -264,6 +271,9 @@ function createSessionEntries(props: {
 export function DialogSelectFile(props: { mode?: DialogSelectFileMode; onOpenFile?: (path: string) => void }) {
  const command = useCommand()
  const language = useLanguage()
+  const platform = usePlatform()
+  const server = useServer()
+  const settings = useSettings()
  const layout = useLayout()
  const file = useFile()
  const dialog = useDialog()
@@ -292,21 +302,21 @@ export function DialogSelectFile(props: { mode?: DialogSelectFileMode; onOpenFil
    if (directory && !dirs.includes(directory)) return [...dirs, directory]
    return dirs
  })
-  const homedir = createMemo(() => serverSync.data.path.home)
+  const homedir = createMemo(() => serverSync().data.path.home)
  const label = (directory: string) => {
    const current = project()
    const kind =
      current && directory === current.worktree
        ? language.t("workspace.type.local")
        : language.t("workspace.type.sandbox")
-    const [store] = serverSync.child(directory, { bootstrap: false })
+    const [store] = serverSync().child(directory, { bootstrap: false })
    const home = homedir()
    const path = home ? directory.replace(home, "~") : directory
    const name = store.vcs?.branch ?? getFilename(directory)
    return `${kind} : ${name || path}`
  }

-  const { sessions } = createSessionEntries({ workspaces, label, serverSDK, language })
+  const { sessions } = createSessionEntries({ workspaces, label, serverSDK: serverSDK(), language })

  const items = async (text: string) => {
    const query = text.trim()
@@ -383,6 +393,21 @@ export function DialogSelectFile(props: { mode?: DialogSelectFileMode; onOpenFil
    state.cleanup?.()
  })

+  if (filesOnly() && platform.platform === "desktop" && settings.general.newLayoutDesigns() && server.current) {
+    return (
+      <DialogSelectFileV2
+        server={server.current}
+        mode="file"
+        start={projectDirectory()}
+        title={language.t("session.header.searchFiles")}
+        onSelect={(result) => {
+          if (typeof result !== "string") return
+          open(result)
+        }}
+      />
+    )
+  }
+
  return (
    <Dialog class="pt-3 pb-0 !max-h-[480px]" transition>
      <List
@@ -19,7 +19,7 @@ export const DialogSelectMcp: Component = () => {
  const language = useLanguage()

  const items = createMemo(() =>
-    Object.entries(sync.data.mcp ?? {})
+    Object.entries(sync().data.mcp ?? {})
      .map(([name, status]) => ({ name, status: status.status }))
      .sort((a, b) => a.name.localeCompare(b.name)),
  )
@@ -48,7 +48,7 @@ export const DialogSelectMcp: Component = () => {
        }}
      >
        {(i) => {
-          const mcpStatus = () => sync.data.mcp[i.name]
+          const mcpStatus = () => sync().data.mcp[i.name]
          const status = () => mcpStatus()?.status
          const statusLabel = () => {
            const key = status() ? statusLabels[status() as keyof typeof statusLabels] : undefined
@@ -0,0 +1,189 @@
+import { expect, test } from "bun:test"
+import {
+  absoluteTreePath,
+  activeTreeNavigation,
+  advanceTreePreload,
+  nextSuggestionIndex,
+  nextTreeScrollTop,
+  pickerTreeEntries,
+  pickerSearchEntries,
+  pickerFileSearchQuery,
+  pickerMode,
+  preloadTreeDirectories,
+  selectedTreePath,
+  treeEntries,
+  treePathWithin,
+  currentPickerSuggestions,
+  createDirectorySearch,
+  displayPickerPath,
+  pickerParent,
+  pickerRoot,
+  pickerAbsoluteInput,
+} from "./directory-picker-domain"
+
+test("maps server directory entries into Pierre paths", () => {
+  expect(
+    treeEntries("src/", [
+      { name: "components", type: "directory" },
+      { name: "index.ts", type: "file" },
+    ]),
+  ).toEqual(["src/components/", "src/index.ts"])
+})
+
+test("maps Pierre paths back to the selected server root", () => {
+  expect(absoluteTreePath("C:/Users/luke", "src/components/")).toBe("C:/Users/luke/src/components")
+  expect(absoluteTreePath("C:/", "")).toBe("C:/")
+  expect(absoluteTreePath("C:/", "README.md")).toBe("C:/README.md")
+  expect(absoluteTreePath("/home/luke", "README.md")).toBe("/home/luke/README.md")
+})
+
+test("includes files only when the picker selects files", () => {
+  const nodes = [
+    { name: "components", type: "directory" as const },
+    { name: "index.ts", type: "file" as const },
+  ]
+  expect(pickerTreeEntries("", nodes, "directory")).toEqual(["components/"])
+  expect(pickerTreeEntries("", nodes, "file")).toEqual(["components/", "index.ts"])
+})
+
+test("includes files in file autocomplete while preserving directory navigation", () => {
+  const nodes = [
+    { name: "src", absolute: "/repo/src", type: "directory" as const },
+    { name: "README.md", absolute: "/repo/README.md", type: "file" as const },
+  ]
+  expect(pickerSearchEntries(nodes, "directory")).toEqual([nodes[0]])
+  expect(pickerSearchEntries(nodes, "file")).toEqual(nodes)
+})
+
+test("centralizes file and directory selection policy", () => {
+  const file = pickerMode("file", "/repo")
+  expect(file.includeFiles).toBeTrue()
+  expect(file.selection("/repo/src", "index.ts")).toBe("src/index.ts")
+  expect(file.selection("/repo", "src/")).toBeUndefined()
+  expect(file.result("/repo", "src/index.ts")).toBe("src/index.ts")
+  expect(file.selection("/tmp", "example.txt")).toBeUndefined()
+  expect(file.navigation("/repo/src")).toBe("/repo/src")
+  expect(file.navigation("/tmp")).toBeUndefined()
+
+  const directory = pickerMode("directory")
+  expect(directory.includeFiles).toBeFalse()
+  expect(directory.selection("/repo", "src/")).toBe("/repo/src")
+  expect(directory.selection("C:/Users/luke", "repos/")).toBe("C:\\Users\\luke\\repos")
+  expect(directory.selection("//Server/Share", "repo/")).toBe("\\\\Server\\Share\\repo")
+  expect(directory.navigation("/tmp")).toBe("/tmp")
+  expect(directory.result("/repo", "")).toBe("/repo")
+  expect(directory.result("C:/Users/luke", "")).toBe("C:\\Users\\luke")
+  expect(directory.result("//Server/Share/repo", "")).toBe("\\\\Server\\Share\\repo")
+  expect(directory.result("/repo", "", false)).toBeUndefined()
+})
+
+test("accepts mutations only from the active navigation", () => {
+  expect(activeTreeNavigation(3, 3)).toBeTrue()
+  expect(activeTreeNavigation(2, 3)).toBeFalse()
+})
+
+test("preserves POSIX case while matching Windows drives case-insensitively", () => {
+  expect(treePathWithin("/repo", "/Repo")).toBeFalse()
+  expect(treePathWithin("C:/Repo", "c:/repo/src")).toBeTrue()
+  expect(treePathWithin("//Server/Share/Repo", "//server/share/repo/src")).toBeTrue()
+  expect(pickerMode("file", "//Server/Share/Repo").selection("//server/share/repo/src", "file.ts")).toBe("src/file.ts")
+  expect(treePathWithin("/repo", "/repo/../tmp")).toBeFalse()
+  expect(treePathWithin("/", "/src")).toBeTrue()
+  expect(pickerMode("file", "C:/Repo").selection("c:/repo/src", "file.ts")).toBe("src/file.ts")
+  expect(pickerMode("file", "C:/").selection("C:/", "file.ts")).toBe("file.ts")
+})
+
+test("displays paths using the selected server path format", () => {
+  expect(displayPickerPath("C:/Users/luke/repos", "C:/Users/luke/repos", "C:/Users/luke")).toBe(
+    "C:\\Users\\luke\\repos",
+  )
+  expect(displayPickerPath("C:/Users/luke/repos", "C:\\Users\\luke\\repos", "C:/Users/luke")).toBe(
+    "C:\\Users\\luke\\repos",
+  )
+  expect(displayPickerPath("/home/luke/repos", "repos", "/home/luke")).toBe("~/repos")
+  expect(displayPickerPath("/home/luke/repos", "~/repos", "/home/luke")).toBe("~/repos")
+})
+
+test("treats the server share prefix as the UNC root", () => {
+  expect(pickerRoot("//Server/Share/repo/src")).toBe("//Server/Share")
+  expect(pickerRoot("\\\\Server\\Share\\repo\\src")).toBe("//Server/Share")
+  expect(pickerParent("//Server/Share")).toBe("//Server/Share")
+  expect(pickerParent("//Server/Share/repo")).toBe("//Server/Share")
+})
+
+test("resolves relative input against the current picker root", () => {
+  expect(pickerAbsoluteInput("src", "/home/luke", "/home/luke/repo")).toBe("/home/luke/repo/src")
+  expect(pickerAbsoluteInput("../other", "/home/luke", "/home/luke/repo")).toBe("/home/luke/other")
+  expect(pickerAbsoluteInput("~/.config", "/home/luke", "/home/luke/repo")).toBe("/home/luke/.config")
+  expect(pickerAbsoluteInput("src", "C:/Users/luke", "C:/Users/luke/repo")).toBe("C:/Users/luke/repo/src")
+})
+
+test("exposes autocomplete results only for their source query", () => {
+  const result = { query: "/repo/src", items: ["/repo/src/index.ts"] }
+  expect(currentPickerSuggestions(result, "/repo/src")).toEqual(result.items)
+  expect(currentPickerSuggestions(result, "/repo/test")).toEqual([])
+})
+
+test("scopes file autocomplete to the current browser root", () => {
+  expect(pickerFileSearchQuery("/home/luke/repos", "/home/luke/repos/src/in", "/home/luke")).toBe("src/in")
+  expect(pickerFileSearchQuery("/home/luke", "~/repos/op", "/home/luke")).toBe("repos/op")
+})
+
+test("resolves directory autocomplete from the current browser root", async () => {
+  const directories: string[] = []
+  const sdk = {
+    client: {
+      find: {
+        files: (input: { directory: string }) => {
+          directories.push(input.directory)
+          return Promise.resolve({ data: [] })
+        },
+      },
+    },
+  } as unknown as Parameters<typeof createDirectorySearch>[0]["sdk"]
+  let base = "/repo"
+  const search = createDirectorySearch({ sdk, home: () => "/home/luke", base: () => base })
+
+  await search("components")
+  base = "/repo/src"
+  await search("components")
+
+  expect(directories).toEqual(["/repo", "/repo/src"])
+})
+
+test("identifies the next directory level to preload", () => {
+  expect(
+    preloadTreeDirectories("src/", [
+      { name: "components", type: "directory" },
+      { name: "index.ts", type: "file" },
+      { name: "utils", type: "directory" },
+    ]),
+  ).toEqual(["src/components/", "src/utils/"])
+})
+
+test("advances preloading once for every expanded directory", () => {
+  const advanced = new Set<string>()
+  expect(advanceTreePreload(advanced, "")).toBeTrue()
+  expect(advanceTreePreload(advanced, "")).toBeFalse()
+  expect(advanceTreePreload(advanced, "repos/")).toBeTrue()
+})
+
+test("clamps bridged tree wheel scrolling", () => {
+  expect(nextTreeScrollTop(100, 40, 500, 200)).toBe(140)
+  expect(nextTreeScrollTop(10, -40, 500, 200)).toBe(0)
+  expect(nextTreeScrollTop(290, 40, 500, 200)).toBe(300)
+})
+
+test("wraps autocomplete keyboard navigation", () => {
+  expect(nextSuggestionIndex(-1, 1, 4)).toBe(0)
+  expect(nextSuggestionIndex(3, 1, 4)).toBe(0)
+  expect(nextSuggestionIndex(0, -1, 4)).toBe(3)
+  expect(nextSuggestionIndex(0, 1, 0)).toBe(-1)
+})
+
+test("returns absolute directories and relative files", () => {
+  expect(selectedTreePath("/home/luke/repo", "src/", "directory")).toBe("/home/luke/repo/src")
+  expect(selectedTreePath("/home/luke/repo", "src/index.ts", "file")).toBe("src/index.ts")
+  expect(selectedTreePath("/home/luke/repo/src", "index.ts", "file", "/home/luke/repo")).toBe("src/index.ts")
+  expect(selectedTreePath("/home/luke/repo", "src/", "file")).toBeUndefined()
+})
@@ -0,0 +1,331 @@
+export function treeEntries(parent: string, nodes: ReadonlyArray<{ name: string; type: "file" | "directory" }>) {
+  const prefix = parent.replace(/^\/+|\/+$/g, "")
+  return nodes.map((node) => {
+    const path = prefix ? `${prefix}/${node.name}` : node.name
+    return node.type === "directory" ? path + "/" : path
+  })
+}
+
+export function pickerTreeEntries(
+  parent: string,
+  nodes: ReadonlyArray<{ name: string; type: "file" | "directory" }>,
+  mode: "directory" | "file",
+) {
+  return treeEntries(parent, mode === "directory" ? nodes.filter((node) => node.type === "directory") : nodes)
+}
+
+export function pickerSearchEntries<T extends { type: "file" | "directory" }>(
+  nodes: readonly T[],
+  mode: "directory" | "file",
+) {
+  return mode === "directory" ? nodes.filter((node) => node.type === "directory") : [...nodes]
+}
+
+export function pickerMode(mode: "directory" | "file", base?: string) {
+  if (mode === "file") {
+    return {
+      includeFiles: true,
+      action: "file" as const,
+      entries(parent: string, nodes: ReadonlyArray<{ name: string; type: "file" | "directory" }>) {
+        return treeEntries(parent, nodes)
+      },
+      navigation(path: string) {
+        return treePathWithin(base, path) ? path : undefined
+      },
+      result(root: string, selected: string) {
+        return selected || undefined
+      },
+      selection(root: string, path: string) {
+        if (!treePathWithin(base, root)) return
+        return selectedTreePath(root, path, "file", base)
+      },
+    }
+  }
+  return {
+    includeFiles: false,
+    action: "directory" as const,
+    entries(parent: string, nodes: ReadonlyArray<{ name: string; type: "file" | "directory" }>) {
+      return treeEntries(
+        parent,
+        nodes.filter((node) => node.type === "directory"),
+      )
+    },
+    navigation(path: string) {
+      return path
+    },
+    result(root: string, selected: string, valid = true) {
+      if (!valid) return
+      return selected || (root ? nativePickerPath(root) : undefined)
+    },
+    selection(root: string, path: string) {
+      return selectedTreePath(root, path, "directory")
+    },
+  }
+}
+
+export function pickerFileSearchQuery(root: string, input: string, home: string) {
+  const value = input
+    .replace(/\\/g, "/")
+    .replace(/^~(?=\/|$)/, home)
+    .replace(/\/+$/, "")
+  const base = root.replace(/\\/g, "/").replace(/\/+$/, "")
+  if (value === base) return ""
+  if (value.startsWith(base + "/")) return value.slice(base.length + 1)
+  return value
+}
+
+export function pickerAbsoluteInput(input: string, home: string, current: string) {
+  const value = normalizePickerDrive(input).replace(/^~(?=\/|$)/, normalizePickerDrive(home))
+  const absolute = pickerRoot(value) ? value : joinPickerPath(current, value)
+  return canonicalPickerPath(absolute)
+}
+
+export function treePathWithin(base: string | undefined, path: string) {
+  return pickerRelativePath(base, path) !== undefined
+}
+
+export function canonicalPickerPath(path: string) {
+  const value = normalizePickerDrive(path)
+  const root = pickerRoot(value)
+  const parts = value.slice(root.length).split("/")
+  const resolved = parts.reduce<string[]>((output, part) => {
+    if (!part || part === ".") return output
+    if (part === "..") {
+      output.pop()
+      return output
+    }
+    output.push(part)
+    return output
+  }, [])
+  return joinPickerPath(root, resolved.join("/"))
+}
+
+export function pickerRelativePath(base: string | undefined, path: string) {
+  if (!base) return
+  const rootPath = canonicalPickerPath(base)
+  const targetPath = canonicalPickerPath(path)
+  const insensitive = /^[A-Za-z]:\//.test(rootPath) || rootPath.startsWith("//")
+  const root = insensitive ? rootPath.toLowerCase() : rootPath
+  const target = insensitive ? targetPath.toLowerCase() : targetPath
+  if (target === root) return ""
+  const prefix = root.endsWith("/") ? root : root + "/"
+  if (!target.startsWith(prefix)) return
+  return targetPath.slice(prefix.length)
+}
+
+export function currentPickerSuggestions<T>(result: { query: string; items: readonly T[] } | undefined, query: string) {
+  if (result?.query !== query) return []
+  return result.items
+}
+
+export function preloadTreeDirectories(
+  parent: string,
+  nodes: ReadonlyArray<{ name: string; type: "file" | "directory" }>,
+) {
+  return treeEntries(
+    parent,
+    nodes.filter((node) => node.type === "directory"),
+  )
+}
+
+export function advanceTreePreload(advanced: Set<string>, path: string) {
+  if (advanced.has(path)) return false
+  advanced.add(path)
+  return true
+}
+
+export function activeTreeNavigation(request: number, current: number) {
+  return request === current
+}
+
+export function nextTreeScrollTop(current: number, delta: number, scrollHeight: number, clientHeight: number) {
+  return Math.min(Math.max(0, scrollHeight - clientHeight), Math.max(0, current + delta))
+}
+
+export function nextSuggestionIndex(current: number, delta: -1 | 1, count: number) {
+  if (count === 0) return -1
+  return (current + delta + count) % count
+}
+
+export function absoluteTreePath(root: string, path: string) {
+  const base = trimPickerPath(root)
+  const relative = path.replace(/\\/g, "/").replace(/^\/+|\/+$/g, "")
+  if (!relative) return base || "/"
+  if (!base || base === "/") return "/" + relative
+  if (base.endsWith("/")) return base + relative
+  return `${base}/${relative}`
+}
+
+export function selectedTreePath(root: string, path: string, mode: "directory" | "file", base?: string) {
+  const directory = path.endsWith("/")
+  if (mode === "file") {
+    if (directory) return
+    if (!base) return path
+    const absolute = absoluteTreePath(root, path)
+    return pickerRelativePath(base, absolute)
+  }
+  return directory ? nativePickerPath(absoluteTreePath(root, path)) : undefined
+}
+
+export function nativePickerPath(path: string) {
+  const value = trimPickerPath(path)
+  if (/^[A-Za-z]:\//.test(value) || value.startsWith("//")) return value.replaceAll("/", "\\")
+  return value
+}
+import { getFilename } from "@opencode-ai/core/util/path"
+import fuzzysort from "fuzzysort"
+import { ServerSDK } from "@/context/server-sdk"
+
+export function cleanPickerInput(value: string) {
+  const first = (value ?? "").split(/\r?\n/)[0] ?? ""
+  return first.replace(/[\u0000-\u001F\u007F]/g, "").trim()
+}
+
+export function normalizePickerPath(input: string) {
+  const value = input.replaceAll("\\", "/")
+  if (value.startsWith("//") && !value.startsWith("///")) return "//" + value.slice(2).replace(/\/+/g, "/")
+  return value.replace(/\/+/g, "/")
+}
+
+export function normalizePickerDrive(input: string) {
+  const value = normalizePickerPath(input)
+  if (/^[A-Za-z]:$/.test(value)) return value + "/"
+  return value
+}
+
+export function trimPickerPath(input: string) {
+  const value = normalizePickerDrive(input)
+  if (value === "/" || value === "//" || /^[A-Za-z]:\/$/.test(value)) return value
+  return value.replace(/\/+$/, "")
+}
+
+export function joinPickerPath(base: string | undefined, relative: string) {
+  const root = trimPickerPath(base ?? "")
+  const path = trimPickerPath(relative).replace(/^\/+/, "")
+  if (!root) return path
+  if (!path) return root
+  if (root.endsWith("/")) return root + path
+  return root + "/" + path
+}
+
+export function pickerRoot(input: string) {
+  const value = normalizePickerDrive(input)
+  if (value.startsWith("//")) {
+    const [server, share] = value.slice(2).split("/")
+    if (server && share) return `//${server}/${share}`
+    return "//"
+  }
+  if (value.startsWith("/")) return "/"
+  if (/^[A-Za-z]:\//.test(value)) return value.slice(0, 3)
+  return ""
+}
+
+export function pickerParent(input: string) {
+  const value = trimPickerPath(input)
+  const root = pickerRoot(value)
+  if (value === root) return value
+  if (value === "/" || value === "//" || /^[A-Za-z]:\/$/.test(value)) return value
+  const index = value.lastIndexOf("/")
+  if (index < root.length) return root
+  if (index <= 0) return "/"
+  if (index === 2 && /^[A-Za-z]:/.test(value)) return value.slice(0, 3)
+  return value.slice(0, index)
+}
+
+function pickerTilde(absolute: string, home: string) {
+  const path = trimPickerPath(absolute)
+  if (!home) return ""
+  const root = trimPickerPath(home)
+  if (/^[A-Za-z]:\//.test(root)) return ""
+  if (path === root) return "~"
+  if (path.startsWith(root + "/")) return "~" + path.slice(root.length)
+  return ""
+}
+
+export function displayPickerPath(path: string, input: string, home: string) {
+  const value = trimPickerPath(path)
+  if (/^[A-Za-z]:\//.test(trimPickerPath(home)) || /^[A-Za-z]:\//.test(value)) return value.replaceAll("/", "\\")
+  return pickerTilde(value, home) || value
+}
+
+export function createDirectorySearch(args: { sdk: ServerSDK; base: () => string | undefined; home: () => string }) {
+  const cache = new Map<string, Promise<Array<{ name: string; absolute: string }>>>()
+  let current = 0
+
+  const scoped = (value: string) => {
+    const base = args.base()
+    if (!base) return
+    const raw = normalizePickerDrive(value)
+    if (!raw) return { directory: trimPickerPath(base), path: "" }
+    const home = args.home()
+    if (raw === "~") return { directory: trimPickerPath(home || base), path: "" }
+    if (raw.startsWith("~/")) return { directory: trimPickerPath(home || base), path: raw.slice(2) }
+    const root = pickerRoot(raw)
+    if (root) return { directory: trimPickerPath(root), path: raw.slice(root.length) }
+    return { directory: trimPickerPath(base), path: raw }
+  }
+
+  const directories = async (directory: string) => {
+    const key = trimPickerPath(directory)
+    const existing = cache.get(key)
+    if (existing) return existing
+    const request = args.sdk.client.file
+      .list({ directory: key, path: "" })
+      .then((result) => result.data ?? [])
+      .catch(() => [])
+      .then((nodes) =>
+        nodes
+          .filter((node) => node.type === "directory")
+          .map((node) => ({ name: node.name, absolute: trimPickerPath(normalizePickerDrive(node.absolute)) })),
+      )
+    cache.set(key, request)
+    return request
+  }
+
+  const match = async (directory: string, query: string, limit: number) => {
+    const items = await directories(directory)
+    if (!query) return items.slice(0, limit).map((item) => item.absolute)
+    return fuzzysort.go(query, items, { key: "name", limit }).map((item) => item.obj.absolute)
+  }
+
+  return async (filter: string) => {
+    const token = ++current
+    const active = () => token === current
+    const value = cleanPickerInput(filter)
+    const input = scoped(value)
+    if (!input) return [] as string[]
+    const raw = normalizePickerDrive(value)
+    const pathInput = raw.startsWith("~") || !!pickerRoot(raw) || raw.includes("/")
+    const query = normalizePickerDrive(input.path)
+    if (!pathInput) {
+      const results = await args.sdk.client.find
+        .files({ directory: input.directory, query, type: "directory", limit: 50 })
+        .then((result) => result.data ?? [])
+        .catch(() => [])
+      if (!active()) return []
+      return results.map((path) => joinPickerPath(input.directory, path)).slice(0, 50)
+    }
+    const segments = query.replace(/^\/+/, "").split("/")
+    const head = segments.slice(0, -1).filter((part) => part && part !== ".")
+    const tail = segments.at(-1) ?? ""
+    let paths = [input.directory]
+    for (const part of head) {
+      if (!active()) return []
+      if (part === "..") {
+        paths = paths.map(pickerParent)
+        continue
+      }
+      paths = Array.from(new Set((await Promise.all(paths.map((path) => match(path, part, 4)))).flat())).slice(0, 12)
+      if (!active() || paths.length === 0) return []
+    }
+    const matches = Array.from(new Set((await Promise.all(paths.map((path) => match(path, tail, 50)))).flat()))
+    if (!active()) return []
+    const base = raw.startsWith("~") ? trimPickerPath(input.directory) : ""
+    if (raw.endsWith("/") || !tail) return Array.from(new Set([base, ...matches].filter(Boolean))).slice(0, 50)
+    const target = matches.find((path) => getFilename(path).toLowerCase() === tail.toLowerCase())
+    if (!target) return matches.slice(0, 50)
+    const children = await match(target, "", 30)
+    if (!active()) return []
+    return Array.from(new Set([base, ...matches, ...children].filter(Boolean))).slice(0, 50)
+  }
+}
@@ -1,9 +1,15 @@
 import { useDialog } from "@opencode-ai/ui/context/dialog"
 import { ServerConnection } from "@/context/server"
 import { usePlatform } from "@/context/platform"
+import { useSettings } from "@/context/settings"
+import { lazy } from "solid-js"
 import { DialogSelectDirectory } from "./dialog-select-directory"
 import { directoryPickerKind } from "./directory-picker-policy"

+const DialogSelectDirectoryV2 = lazy(() =>
+  import("./dialog-select-directory-v2").then((module) => ({ default: module.DialogSelectDirectoryV2 })),
+)
+
 type DirectoryPickerInput = {
  server: ServerConnection.Any
  title?: string
@@ -13,6 +19,7 @@ type DirectoryPickerInput = {

 export function useDirectoryPicker() {
  const platform = usePlatform()
+  const settings = useSettings()
  const dialog = useDialog()

  return (input: DirectoryPickerInput) => {
@@ -21,9 +28,18 @@ export function useDirectoryPicker() {
      return
    }

-    dialog.show(
-      () => <DialogSelectDirectory {...input} />,
-      () => input.onSelect(null),
-    )
+    let selected = false
+    const onSelect = (result: string | string[] | null) => {
+      selected = result !== null
+      input.onSelect(result)
+    }
+    const cancel = () => {
+      if (!selected) input.onSelect(null)
+    }
+    if (platform.platform === "desktop" && settings.general.newLayoutDesigns()) {
+      dialog.show(() => <DialogSelectDirectoryV2 {...input} onSelect={onSelect} />, cancel)
+      return
+    }
+    dialog.show(() => <DialogSelectDirectory {...input} onSelect={onSelect} />, cancel)
  }
 }
@@ -0,0 +1,23 @@
+import { expect, test } from "bun:test"
+import { FileTree, type FileTreeDirectoryHandle } from "@pierre/trees"
+
+test("reports directory expansion changes", () => {
+  const changes: Array<{ path: string; expanded: boolean }> = []
+  const tree = new FileTree({
+    paths: ["src/"],
+    onExpansionChange: (change) => changes.push(change),
+  })
+
+  const src = tree.getItem("src/")
+  if (!src || !src.isDirectory()) throw new Error("Expected src to be a directory")
+  const directory = src as FileTreeDirectoryHandle
+
+  directory.expand()
+  directory.collapse()
+
+  expect(changes).toEqual([
+    { path: "src/", expanded: true },
+    { path: "src/", expanded: false },
+  ])
+  tree.cleanUp()
+})
@@ -0,0 +1,117 @@
+// @ts-nocheck
+import { createStore } from "solid-js/store"
+import { createPromptState } from "@/context/prompt"
+import { createPromptInputHistory, PromptInput } from "./prompt-input"
+
+function PromptInputExample() {
+  const state = createPromptState()
+  const history = createPromptInputHistory()
+  const [controls, setControls] = createStore({
+    agent: "build",
+    variant: undefined as string | undefined,
+    comments: 0,
+    tabs: [] as string[],
+    activeTab: undefined as string | undefined,
+    reviewOpen: false,
+  })
+  const model = {
+    current: () => ({ id: "claude-3-7-sonnet", name: "Claude 3.7 Sonnet", provider: { id: "anthropic" } }),
+    variant: {
+      list: () => ["fast", "thinking"],
+      current: () => controls.variant,
+      set: (variant?: string) => setControls("variant", variant),
+    },
+  }
+  const submission = {
+    abort() {},
+    handleSubmit(event: Event) {
+      event.preventDefault()
+      state.reset()
+    },
+  }
+  const inputControls = {
+    agents: {
+      available: [{ name: "review", hidden: false, mode: "subagent" }],
+      options: ["build", "review", "plan"],
+      get current() {
+        return controls.agent
+      },
+      loading: false,
+      visible: true,
+      select: (agent?: string) => setControls("agent", agent ?? "build"),
+    },
+    model: {
+      selection: model,
+      paid: true,
+      loading: false,
+    },
+    projects: {
+      available: [{ name: "Story project", worktree: "/tmp/story", sandboxes: [] }],
+      directory: "/tmp/story",
+      select() {},
+      add() {},
+    },
+    session: {
+      id: "story-session",
+      tabs: {
+        active: () => controls.activeTab,
+        all: () => controls.tabs,
+        open: (tab: string) => setControls("tabs", (tabs) => (tabs.includes(tab) ? tabs : [...tabs, tab])),
+        setActive: (tab: string) => setControls("activeTab", tab),
+      },
+      reviewPanel: {
+        opened: () => controls.reviewOpen,
+        open: () => setControls("reviewOpen", true),
+      },
+    },
+    newLayoutDesigns: true,
+  }
+  const addReviewComment = () => {
+    const comment = controls.comments + 1
+    setControls("comments", comment)
+    state.context.add({
+      type: "file",
+      path: "src/components/prompt-input.tsx",
+      selection: {
+        startLine: 84 + comment,
+        startChar: 0,
+        endLine: 84 + comment,
+        endChar: 0,
+      },
+      comment: `Review comment ${comment}`,
+      commentID: `review-comment-${comment}`,
+      commentOrigin: "review",
+      preview: "export const PromptInput = ...",
+    })
+  }
+
+  return (
+    <div class="flex flex-col gap-3">
+      <PromptInput controls={inputControls} state={state} history={history} submission={submission} />
+      <div>
+        <button
+          type="button"
+          class="rounded-md border border-border-weak-base bg-background-base px-2.5 py-1.5 text-12-medium text-text-base hover:bg-background-stronger"
+          onClick={addReviewComment}
+        >
+          Add review comment
+        </button>
+      </div>
+    </div>
+  )
+}
+
+export default {
+  title: "App/PromptInput",
+  id: "app-prompt-input",
+  component: PromptInput,
+}
+
+export const Basic = {
+  render: () => (
+    <div class="pt-10">
+      <h1 class="mb-4">Prompt Input</h1>
+      <PromptInputExample />
+    </div>
+  ),
+}
@@ -17,8 +17,8 @@ import {
  type JSX,
 } from "solid-js"
 import { Popover as KobaltePopover } from "@kobalte/core/popover"
-import { createStore } from "solid-js/store"
-import { useLocal } from "@/context/local"
+import { createStore, type SetStoreFunction, type Store } from "solid-js/store"
+import type { useLocal } from "@/context/local"
 import { selectionFromLines, type SelectedLineRange, useFile } from "@/context/file"
 import {
  ContentPart,
@@ -31,10 +31,7 @@ import {
  FileAttachmentPart,
 } from "@/context/prompt"
 import { useLayout } from "@/context/layout"
-import { useNavigate, useSearchParams } from "@solidjs/router"
 import { useSDK } from "@/context/sdk"
-import { useServer } from "@/context/server"
-import { useTabs } from "@/context/tabs"
 import { useSync } from "@/context/sync"
 import { useComments } from "@/context/comments"
 import { Button } from "@opencode-ai/ui/button"
@@ -46,14 +43,11 @@ import { IconButton } from "@opencode-ai/ui/icon-button"
 import { Select } from "@opencode-ai/ui/select"
 import { useDialog } from "@opencode-ai/ui/context/dialog"
 import { ModelSelectorPopover } from "@/components/dialog-select-model"
-import { useProviders } from "@/hooks/use-providers"
 import { useCommand } from "@/context/command"
 import { Persist, persisted } from "@/utils/persist"
 import { usePermission } from "@/context/permission"
 import { useLanguage } from "@/context/language"
 import { usePlatform } from "@/context/platform"
-import { useSettings } from "@/context/settings"
-import { useSessionLayout } from "@/pages/session/session-layout"
 import { createSessionTabs } from "@/pages/session/helpers"
 import { createTextFragment, getCursorPosition, setCursorPosition, setRangeEdge } from "./prompt-input/editor-dom"
 import { createPromptAttachments } from "./prompt-input/attachments"
@@ -73,18 +67,104 @@ import { PromptContextItems } from "./prompt-input/context-items"
 import { PromptImageAttachments } from "./prompt-input/image-attachments"
 import { PromptDragOverlay } from "./prompt-input/drag-overlay"
 import { promptPlaceholder } from "./prompt-input/placeholder"
-import { useDirectoryPicker } from "./directory-picker"
 import { showToast } from "@/utils/toast"
 import { ImagePreview } from "@opencode-ai/ui/image-preview"
-import { useQueries } from "@tanstack/solid-query"
-import { useQueryOptions } from "@/context/server-sync"
 import { pathKey } from "@/utils/path-key"
-import { base64Encode } from "@opencode-ai/core/util/encode"
 import { displayName } from "@/pages/layout/helpers"

-interface PromptInputProps {
+export type PromptInputState = ReturnType<typeof usePrompt>
+
+export type PromptInputHistory = {
+  entries: (mode: "normal" | "shell") => PromptHistoryStoredEntry[]
+  add: (prompt: Prompt, mode: "normal" | "shell", comments: PromptHistoryComment[]) => void
+}
+
+export type PromptInputSubmission = {
+  abort: () => Promise<void> | void
+  handleSubmit: (event: Event) => Promise<void> | void
+}
+
+export type PromptInputControls = {
+  agents: {
+    available: { name: string; hidden?: boolean; mode: string }[]
+    options: string[]
+    current: string
+    loading: boolean
+    visible: boolean
+    select: (name: string | undefined) => void
+  }
+  model: {
+    selection: ReturnType<typeof useLocal>["model"]
+    paid: boolean
+    loading: boolean
+  }
+  projects: {
+    available: { name?: string; worktree: string; sandboxes?: string[] }[]
+    directory: string
+    select: (worktree: string) => void
+    add: (title: string) => void
+  }
+  session: {
+    id?: string
+    tabs: {
+      active: () => string | undefined
+      all: () => string[]
+      open: (tab: string) => void | Promise<void>
+      setActive: (tab: string) => void
+    }
+    reviewPanel: {
+      opened: () => boolean
+      open: () => void
+    }
+  }
+  newLayoutDesigns: boolean
+}
+
+export function createPromptInputHistory(): PromptInputHistory {
+  const [normal, setNormal] = createStore<PromptHistoryState>({ entries: [] })
+  const [shell, setShell] = createStore<PromptHistoryState>({ entries: [] })
+  return createPromptInputHistoryStore(normal, setNormal, shell, setShell)
+}
+
+type PromptHistoryState = { entries: PromptHistoryStoredEntry[] }
+
+function createPromptInputHistoryStore(
+  normal: Store<PromptHistoryState>,
+  setNormal: SetStoreFunction<PromptHistoryState>,
+  shell: Store<PromptHistoryState>,
+  setShell: SetStoreFunction<PromptHistoryState>,
+): PromptInputHistory {
+  return {
+    entries: (mode) => (mode === "shell" ? shell.entries : normal.entries),
+    add(prompt, mode, comments) {
+      const current = mode === "shell" ? shell : normal
+      const setCurrent = mode === "shell" ? setShell : setNormal
+      const next = prependHistoryEntry(current.entries, prompt, comments)
+      if (next === current.entries) return
+      setCurrent("entries", next)
+    },
+  }
+}
+
+function createPersistedPromptInputHistory() {
+  const [normal, setNormal] = persisted(
+    Persist.global("prompt-history", ["prompt-history.v1"]),
+    createStore<PromptHistoryState>({ entries: [] }),
+  )
+  const [shell, setShell] = persisted(
+    Persist.global("prompt-history-shell", ["prompt-history-shell.v1"]),
+    createStore<PromptHistoryState>({ entries: [] }),
+  )
+  return createPromptInputHistoryStore(normal, setNormal, shell, setShell)
+}
+
+export interface PromptInputProps {
  class?: string
  variant?: "dock" | "new-session"
+  state?: PromptInputState
+  history?: PromptInputHistory
+  submission?: PromptInputSubmission
+  controls: PromptInputControls
  ref?: (el: HTMLDivElement) => void
  newSessionWorktree?: string
  onNewSessionWorktreeReset?: () => void
@@ -126,27 +206,18 @@ const EXAMPLES = [

 export const PromptInput: Component<PromptInputProps> = (props) => {
  const sdk = useSDK()
-  const navigate = useNavigate()
-  const queryOptions = useQueryOptions()

  const sync = useSync()
-  const local = useLocal()
  const files = useFile()
-  const prompt = usePrompt()
+  const prompt = props.state ?? usePrompt()
  const layout = useLayout()
-  const server = useServer()
  const comments = useComments()
  const dialog = useDialog()
-  const providers = useProviders()
  const command = useCommand()
  const permission = usePermission()
  const language = useLanguage()
  const platform = usePlatform()
-  const pickDirectory = useDirectoryPicker()
-  const settings = useSettings()
-  const tabsStore = useTabs()
-  const [search] = useSearchParams<{ draftId?: string }>()
-  const { params, tabs, view } = useSessionLayout()
+  const tabs = () => props.controls.session.tabs
  let editorRef!: HTMLDivElement
  let fileInputRef: HTMLInputElement | undefined
  let scrollRef!: HTMLDivElement
@@ -204,10 +275,10 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
  }).activeFileTab

  const commentInReview = (path: string) => {
-    const sessionID = params.id
+    const sessionID = props.controls.session.id
    if (!sessionID) return false

-    const diffs = sync.data.session_diff[sessionID]
+    const diffs = sync().data.session_diff[sessionID]
    if (!diffs) return false
    return diffs.some((diff) => diff.file === path)
  }
@@ -237,14 +308,14 @@ export const PromptInput: Component<PromptInputProps> = (props) => {

    const wantsReview = item.commentOrigin === "review" || (item.commentOrigin !== "file" && commentInReview(item.path))
    if (wantsReview) {
-      if (!view().reviewPanel.opened()) view().reviewPanel.open()
+      if (!props.controls.session.reviewPanel.opened()) props.controls.session.reviewPanel.open()
      layout.fileTree.setTab("changes")
      tabs().setActive("review")
      queueCommentFocus()
      return
    }

-    if (!view().reviewPanel.opened()) view().reviewPanel.open()
+    if (!props.controls.session.reviewPanel.opened()) props.controls.session.reviewPanel.open()
    layout.fileTree.setTab("all")
    const tab = files.tab(item.path)
    void tabs().open(tab)
@@ -269,8 +340,8 @@ export const PromptInput: Component<PromptInputProps> = (props) => {

    return paths
  })
-  const info = createMemo(() => (params.id ? sync.session.get(params.id) : undefined))
-  const working = createMemo(() => sync.data.session_working(params.id ?? ""))
+  const info = createMemo(() => (props.controls.session.id ? sync().session.get(props.controls.session.id) : undefined))
+  const working = createMemo(() => sync().data.session_working(props.controls.session.id ?? ""))
  const imageAttachments = createMemo(() =>
    prompt.current().filter((part): part is ImageAttachmentPart => part.type === "image"),
  )
@@ -347,29 +418,14 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
  })

  const hasUserPrompt = createMemo(() => {
-    const sessionID = params.id
+    const sessionID = props.controls.session.id
    if (!sessionID) return false
-    const messages = sync.data.message[sessionID]
+    const messages = sync().data.message[sessionID]
    if (!messages) return false
    return messages.some((m) => m.role === "user")
  })

-  const [history, setHistory] = persisted(
-    Persist.global("prompt-history", ["prompt-history.v1"]),
-    createStore<{
-      entries: PromptHistoryStoredEntry[]
-    }>({
-      entries: [],
-    }),
-  )
-  const [shellHistory, setShellHistory] = persisted(
-    Persist.global("prompt-history-shell", ["prompt-history-shell.v1"]),
-    createStore<{
-      entries: PromptHistoryStoredEntry[]
-    }>({
-      entries: [],
-    }),
-  )
+  const history = props.history ?? createPersistedPromptInputHistory()

  const suggest = createMemo(() => !hasUserPrompt())

@@ -474,7 +530,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
  const pick = () => {
    pickAttachmentFiles({
      picker: platform.openAttachmentPickerDialog,
-      directory: () => sdk.directory,
+      directory: () => sdk().directory,
      fallback: () => fileInputRef?.click(),
      onFile: addAttachment,
      onError: (error) =>
@@ -573,8 +629,8 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
  }

  createEffect(() => {
-    params.id
-    if (params.id) return
+    props.controls.session.id
+    if (props.controls.session.id) return
    if (!suggest()) return
    const interval = setInterval(() => {
      setStore("placeholder", (prev) => (prev + 1) % EXAMPLES.length)
@@ -603,11 +659,10 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
  }

  const agentList = createMemo(() =>
-    sync.data.agent
+    props.controls.agents.available
      .filter((agent) => !agent.hidden && agent.mode !== "primary")
      .map((agent): AtOption => ({ type: "agent", name: agent.name, display: agent.name })),
  )
-  const agentNames = createMemo(() => local.agent.list().map((agent) => agent.name))

  const handleAtSelect = (option: AtOption | undefined) => {
    if (!option) return
@@ -673,7 +728,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
        type: "builtin" as const,
      }))

-    const custom = sync.data.command.map((cmd) => ({
+    const custom = sync().data.command.map((cmd) => ({
      id: `custom.${cmd.name}`,
      trigger: cmd.name,
      title: cmd.name,
@@ -1033,11 +1088,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
  }

  const addToHistory = (prompt: Prompt, mode: "normal" | "shell") => {
-    const currentHistory = mode === "shell" ? shellHistory : history
-    const setCurrentHistory = mode === "shell" ? setShellHistory : setHistory
-    const next = prependHistoryEntry(currentHistory.entries, prompt, mode === "shell" ? [] : historyComments())
-    if (next === currentHistory.entries) return
-    setCurrentHistory("entries", next)
+    history.add(prompt, mode, mode === "shell" ? [] : historyComments())
  }

  createEffect(
@@ -1082,7 +1133,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
  const navigateHistory = (direction: "up" | "down") => {
    const result = navigatePromptHistory({
      direction,
-      entries: store.mode === "shell" ? shellHistory.entries : history.entries,
+      entries: history.entries(store.mode),
      historyIndex: store.historyIndex,
      currentPrompt: prompt.current(),
      currentComments: historyComments(),
@@ -1096,6 +1147,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
  }

  const { addAttachment, addAttachments, removeAttachment, handlePaste } = createPromptAttachments({
+    prompt,
    editor: () => editorRef,
    isDialogActive: () => !!dialog.active,
    setDraggingType: (type) => setStore("draggingType", type),
@@ -1105,6 +1157,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
    },
    addPart,
    readClipboardImage: platform.readClipboardImage,
+    getPathForFile: platform.getPathForFile,
  })

  const fileAttachmentInput = () => (
@@ -1122,38 +1175,41 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
    />
  )

-  const variants = createMemo(() => ["default", ...local.model.variant.list()])
+  const variants = createMemo(() => ["default", ...props.controls.model.selection.variant.list()])
  // Check provider variants directly: `variants` also includes the UI-only default option.
-  const showVariantControl = createMemo(() => local.model.variant.list().length > 0)
+  const showVariantControl = createMemo(() => props.controls.model.selection.variant.list().length > 0)
  const accepting = createMemo(() => {
-    const id = params.id
-    if (!id) return permission.isAutoAcceptingDirectory(sdk.directory)
-    return permission.isAutoAccepting(id, sdk.directory)
+    const id = props.controls.session.id
+    if (!id) return permission.isAutoAcceptingDirectory(sdk().directory)
+    return permission.isAutoAccepting(id, sdk().directory)
  })

-  const { abort, handleSubmit } = createPromptSubmit({
-    info,
-    imageAttachments,
-    commentCount,
-    autoAccept: () => accepting(),
-    mode: () => store.mode,
-    working,
-    editor: () => editorRef,
-    queueScroll,
-    promptLength,
-    addToHistory,
-    resetHistoryNavigation: () => {
-      resetHistoryNavigation(true)
-    },
-    setMode: (mode) => setStore("mode", mode),
-    setPopover: (popover) => setStore("popover", popover),
-    newSessionWorktree: () => props.newSessionWorktree,
-    onNewSessionWorktreeReset: props.onNewSessionWorktreeReset,
-    shouldQueue: props.shouldQueue,
-    onQueue: props.onQueue,
-    onAbort: props.onAbort,
-    onSubmit: props.onSubmit,
-  })
+  const { abort, handleSubmit } =
+    props.submission ??
+    createPromptSubmit({
+      prompt,
+      info,
+      imageAttachments,
+      commentCount,
+      autoAccept: () => accepting(),
+      mode: () => store.mode,
+      working,
+      editor: () => editorRef,
+      queueScroll,
+      promptLength,
+      addToHistory,
+      resetHistoryNavigation: () => {
+        resetHistoryNavigation(true)
+      },
+      setMode: (mode) => setStore("mode", mode),
+      setPopover: (popover) => setStore("popover", popover),
+      newSessionWorktree: () => props.newSessionWorktree,
+      onNewSessionWorktreeReset: props.onNewSessionWorktreeReset,
+      shouldQueue: props.shouldQueue,
+      onQueue: props.onQueue,
+      onAbort: props.onAbort,
+      onSubmit: props.onSubmit,
+    })

  const handleKeyDown = (event: KeyboardEvent) => {
    if ((event.metaKey || event.ctrlKey) && !event.altKey && !event.shiftKey && event.key.toLowerCase() === "u") {
@@ -1317,17 +1373,9 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
    }
  }

-  const [agentsQuery, globalProvidersQuery, providersQuery] = useQueries(() => ({
-    queries: [
-      queryOptions.agents(pathKey(sdk.directory)),
-      queryOptions.providers(null),
-      queryOptions.providers(pathKey(sdk.directory)),
-    ],
-  }))
-
-  const agentsLoading = () => agentsQuery.isLoading
+  const agentsLoading = () => props.controls.agents.loading
  const agentsShouldFadeIn = createMemo((prev) => prev ?? agentsLoading())
-  const providersLoading = () => agentsLoading() || providersQuery.isLoading || globalProvidersQuery.isLoading
+  const providersLoading = () => props.controls.model.loading
  const providersShouldFadeIn = createMemo((prev) => prev ?? providersLoading())

  const [promptReady] = createResource(
@@ -1342,23 +1390,23 @@ export const PromptInput: Component<PromptInputProps> = (props) => {

  const modelControlState = createMemo<ComposerModelControlState>(() => ({
    loading: providersLoading(),
-    paid: providers.paid().length > 0,
+    paid: props.controls.model.paid,
    title: language.t("command.model.choose"),
    keybind: command.keybind("model.choose"),
-    model: local.model,
-    providerID: local.model.current()?.provider?.id,
-    modelName: local.model.current()?.name ?? language.t("dialog.model.select.title"),
+    model: props.controls.model.selection,
+    providerID: props.controls.model.selection.current()?.provider?.id,
+    modelName: props.controls.model.selection.current()?.name ?? language.t("dialog.model.select.title"),
    style: control(),
    onClose: restoreFocus,
    onUnpaidClick: () => {
      void import("@/components/dialog-select-model-unpaid").then((x) => {
-        dialog.show(() => <x.DialogSelectModelUnpaid model={local.model} />)
+        dialog.show(() => <x.DialogSelectModelUnpaid model={props.controls.model.selection} />)
      })
    },
  }))

  const newSession = () => props.variant === "new-session"
-  const projects = createMemo(() => layout.projects.list())
+  const projects = createMemo(() => props.controls.projects.available)
  const projectForDirectory = (directory: string | undefined) => {
    if (!directory) return
    const key = pathKey(directory)
@@ -1366,13 +1414,13 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
      (project) => pathKey(project.worktree) === key || project.sandboxes?.some((sandbox) => pathKey(sandbox) === key),
    )
  }
-  const selectedProject = createMemo(() => projectForDirectory(sdk.directory))
+  const selectedProject = createMemo(() => projectForDirectory(props.controls.projects.directory))
  const projectResults = createMemo(() => {
    const search = picker.projectSearch.trim().toLowerCase()
    if (!search) return projects()
    return projects().filter((project) => displayName(project).toLowerCase().includes(search))
  })
-  const showAgentControl = createMemo(() => settings.general.showCustomAgents() && agentNames().length > 0)
+  const showAgentControl = createMemo(() => props.controls.agents.visible && props.controls.agents.options.length > 0)
  const selectProject = (worktree: string) => {
    setPicker({
      projectOpen: false,
@@ -1382,33 +1430,11 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
      restoreFocus()
      return
    }
-    layout.projects.open(worktree)
-    server.projects.touch(worktree)
-
-    // On the draft route, retarget the existing draft in place so we keep the same
-    // draft id (and its tab/prompt) instead of spawning a new draft for the new directory.
-    const draftID = search.draftId
-    if (draftID) {
-      tabsStore.updateDraft(draftID, { server: server.key, directory: worktree })
-      restoreFocus()
-      return
-    }
-
-    navigate(`/${base64Encode(worktree)}/session`)
+    props.controls.projects.select(worktree)
+    restoreFocus()
  }
  const addProject = () => {
-    const conn = server.current
-    if (!conn) return
-    const select = (result: string | string[] | null) => {
-      const directory = Array.isArray(result) ? result[0] : result
-      if (!directory) return
-      selectProject(directory)
-    }
-    pickDirectory({
-      server: conn,
-      title: language.t("command.project.open"),
-      onSelect: select,
-    })
+    props.controls.projects.add(language.t("command.project.open"))
  }

  const projectPickerState = createMemo<ComposerPickerState>(() => ({
@@ -1449,11 +1475,11 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
  const agentControlState = createMemo<ComposerAgentControlState>(() => ({
    title: language.t("command.agent.cycle"),
    keybind: command.keybind("agent.cycle"),
-    options: agentNames(),
-    current: local.agent.current()?.name ?? "",
+    options: props.controls.agents.options,
+    current: props.controls.agents.current,
    style: control(),
    onSelect: (value) => {
-      local.agent.set(value)
+      props.controls.agents.select(value)
      restoreFocus()
    },
  }))
@@ -1485,7 +1511,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
        t={(key) => language.t(key as Parameters<typeof language.t>[0])}
      />
      <Switch>
-        <Match when={settings.general.newLayoutDesigns()}>
+        <Match when={props.controls.newLayoutDesigns}>
          <div class="flex flex-col gap-3">
            <DockShellForm
              data-component={newSession() ? "session-new-composer" : "session-composer"}
@@ -1605,7 +1631,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
                      data-component="prompt-variant-control"
                      classList={{
                        "hidden group-hover/prompt-input:block group-focus-within/prompt-input:block":
-                          !local.model.variant.current() && !store.variantOpen,
+                          !props.controls.model.selection.variant.current() && !store.variantOpen,
                      }}
                    >
                      <TooltipKeybind
@@ -1617,11 +1643,11 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
                        <Select
                          size="normal"
                          options={variants()}
-                          current={local.model.variant.current() ?? "default"}
+                          current={props.controls.model.selection.variant.current() ?? "default"}
                          label={(x) => (x === "default" ? language.t("common.default") : x)}
                          onOpenChange={(open) => setStore("variantOpen", open)}
                          onSelect={(value) => {
-                            local.model.variant.set(value === "default" ? undefined : value)
+                            props.controls.model.selection.variant.set(value === "default" ? undefined : value)
                            restoreFocus()
                          }}
                          class="capitalize max-w-[160px] justify-start text-v2-text-text-faint"
@@ -1861,10 +1887,10 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
                        >
                          <Select
                            size="normal"
-                            options={agentNames()}
-                            current={local.agent.current()?.name ?? ""}
+                            options={props.controls.agents.options}
+                            current={props.controls.agents.current}
                            onSelect={(value) => {
-                              local.agent.set(value)
+                              props.controls.agents.select(value)
                              restoreFocus()
                            }}
                            class="capitalize max-w-[160px] text-text-base"
@@ -1883,7 +1909,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
                          style={providersShouldFadeIn() ? { animation: "fade-in 0.3s" } : undefined}
                        >
                          <Show
-                            when={providers.paid().length > 0}
+                            when={props.controls.model.paid}
                            fallback={
                              <TooltipKeybind
                                placement="top"
@@ -1900,19 +1926,22 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
                                  style={control()}
                                  onClick={() => {
                                    void import("@/components/dialog-select-model-unpaid").then((x) => {
-                                      dialog.show(() => <x.DialogSelectModelUnpaid model={local.model} />)
+                                      dialog.show(() => (
+                                        <x.DialogSelectModelUnpaid model={props.controls.model.selection} />
+                                      ))
                                    })
                                  }}
                                >
-                                  <Show when={local.model.current()?.provider?.id}>
+                                  <Show when={props.controls.model.selection.current()?.provider?.id}>
                                    <ProviderIcon
-                                      id={local.model.current()?.provider?.id ?? ""}
+                                      id={props.controls.model.selection.current()?.provider?.id ?? ""}
                                      class="size-4 shrink-0 opacity-40 group-hover:opacity-100 transition-opacity duration-150"
                                      style={{ "will-change": "opacity", transform: "translateZ(0)" }}
                                    />
                                  </Show>
                                  <span class="truncate">
-                                    {local.model.current()?.name ?? language.t("dialog.model.select.title")}
+                                    {props.controls.model.selection.current()?.name ??
+                                      language.t("dialog.model.select.title")}
                                  </span>
                                  <Icon name="chevron-down" size="small" class="shrink-0" />
                                </Button>
@@ -1926,7 +1955,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
                              keybind={command.keybind("model.choose")}
                            >
                              <ModelSelectorPopover
-                                model={local.model}
+                                model={props.controls.model.selection}
                                triggerAs={Button}
                                triggerProps={{
                                  variant: "ghost",
@@ -1937,15 +1966,16 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
                                }}
                                onClose={restoreFocus}
                              >
-                                <Show when={local.model.current()?.provider?.id}>
+                                <Show when={props.controls.model.selection.current()?.provider?.id}>
                                  <ProviderIcon
-                                    id={local.model.current()?.provider?.id ?? ""}
+                                    id={props.controls.model.selection.current()?.provider?.id ?? ""}
                                    class="size-4 shrink-0 opacity-40 group-hover:opacity-100 transition-opacity duration-150"
                                    style={{ "will-change": "opacity", transform: "translateZ(0)" }}
                                  />
                                </Show>
                                <span class="truncate">
-                                  {local.model.current()?.name ?? language.t("dialog.model.select.title")}
+                                  {props.controls.model.selection.current()?.name ??
+                                    language.t("dialog.model.select.title")}
                                </span>
                                <Icon name="chevron-down" size="small" class="shrink-0" />
                              </ModelSelectorPopover>
@@ -1966,10 +1996,10 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
                              <Select
                                size="normal"
                                options={variants()}
-                                current={local.model.variant.current() ?? "default"}
+                                current={props.controls.model.selection.variant.current() ?? "default"}
                                label={(x) => (x === "default" ? language.t("common.default") : x)}
                                onSelect={(value) => {
-                                  local.model.variant.set(value === "default" ? undefined : value)
+                                  props.controls.model.selection.variant.set(value === "default" ? undefined : value)
                                  restoreFocus()
                                }}
                                class="capitalize max-w-[160px] text-text-base"
@@ -1,7 +1,7 @@
 import { onMount } from "solid-js"
 import { makeEventListener } from "@solid-primitives/event-listener"
 import { showToast } from "@/utils/toast"
-import { usePrompt, type ContentPart, type ImageAttachmentPart } from "@/context/prompt"
+import { type ContentPart, type ImageAttachmentPart, type usePrompt } from "@/context/prompt"
 import { useLanguage } from "@/context/language"
 import { uuid } from "@/utils/uuid"
 import { getCursorPosition } from "./editor-dom"
@@ -26,16 +26,18 @@ function dataUrl(file: File, mime: string) {
 }

 type PromptAttachmentsInput = {
+  prompt: ReturnType<typeof usePrompt>
  editor: () => HTMLDivElement | undefined
  isDialogActive: () => boolean
  setDraggingType: (type: "image" | "@mention" | null) => void
  focusEditor: () => void
  addPart: (part: ContentPart) => boolean
  readClipboardImage?: () => Promise<File | null>
+  getPathForFile?: (file: File) => string
 }

 export function createPromptAttachments(input: PromptAttachmentsInput) {
-  const prompt = usePrompt()
+  const prompt = input.prompt
  const language = useLanguage()

  const warn = () => {
@@ -62,6 +64,7 @@ export function createPromptAttachments(input: PromptAttachmentsInput) {
      type: "image",
      id: uuid(),
      filename: file.name,
+      sourcePath: input.getPathForFile?.(file) || undefined,
      mime,
      dataUrl: url,
    }
@@ -75,6 +75,31 @@ describe("buildRequestParts", () => {
    expect(files.map((part) => (part.type === "file" ? part.filename : ""))).toEqual(["a.png", "b.pdf"])
  })

+  test("preserves an external attachment source path for the model", () => {
+    const result = buildRequestParts({
+      prompt: [],
+      context: [],
+      images: [
+        {
+          type: "image",
+          id: "img_external",
+          filename: "opencode.global.dat",
+          sourcePath: "C:\\Users\\Luke\\AppData\\Roaming\\ai.opencode.desktop.beta\\opencode.global.dat",
+          mime: "text/plain",
+          dataUrl: "data:text/plain;base64,AAA",
+        },
+      ],
+      text: "inspect this",
+      messageID: "msg_external",
+      sessionID: "ses_external",
+      sessionDirectory: "C:\\Repos\\sst\\opencode",
+    })
+
+    expect(result.requestParts.find((part) => part.type === "file")?.filename).toBe(
+      "C:\\Users\\Luke\\AppData\\Roaming\\ai.opencode.desktop.beta\\opencode.global.dat",
+    )
+  })
+
  test("deduplicates context files when prompt already includes same path", () => {
    const prompt: Prompt = [{ type: "file", path: "src/foo.ts", content: "@src/foo.ts", start: 0, end: 11 }]

@@ -188,7 +188,7 @@ export function buildRequestParts(input: BuildRequestPartsInput) {
      type: "file",
      mime: attachment.mime,
      url: attachment.dataUrl,
-      filename: attachment.filename,
+      filename: attachment.sourcePath ?? attachment.filename,
    } satisfies PromptRequestPart
  })

@@ -50,7 +50,7 @@ export const PromptContextItems: Component<ContextItemsProps> = (props) => {
                >
                  <div class="flex items-center gap-1.5">
                    <FileIcon node={{ path: item.path, type: "file" }} class="shrink-0 size-3.5" />
-                    <div class="flex items-center text-11-regular min-w-0 font-medium">
+                    <div class="flex items-center text-[12px] min-w-0 font-medium leading-5">
                      <span class="text-text-strong whitespace-nowrap">{label}</span>
                      <Show when={item.selection}>
                        {(sel) => (
@@ -26,6 +26,22 @@ let selected = "/repo/worktree-a"
 let variant: string | undefined

 const promptValue: Prompt = [{ type: "text", content: "ls", start: 0, end: 2 }]
+const prompt = {
+  ready: () => Object.assign(() => true, { promise: Promise.resolve(true) }),
+  current: () => promptValue,
+  cursor: () => 0,
+  dirty: () => true,
+  reset: () => undefined,
+  set: () => undefined,
+  context: {
+    add: () => undefined,
+    remove: () => undefined,
+    removeComment: () => undefined,
+    updateComment: () => undefined,
+    replaceComments: () => undefined,
+    items: () => [],
+  },
+}

 const clientFor = (directory: string) => {
  createdClients.push(directory)
@@ -73,6 +89,7 @@ beforeAll(async () => {
  }))

  mock.module("@opencode-ai/ui/toast", () => ({
+    Toast: { Region: () => null },
    showToast: () => 0,
  }))

@@ -116,16 +133,7 @@ beforeAll(async () => {
  }))

  mock.module("@/context/prompt", () => ({
-    usePrompt: () => ({
-      current: () => promptValue,
-      reset: () => undefined,
-      set: () => undefined,
-      context: {
-        add: () => undefined,
-        remove: () => undefined,
-        items: () => [],
-      },
-    }),
+    usePrompt: () => prompt,
  }))

  mock.module("@/context/layout", () => ({
@@ -147,12 +155,12 @@ beforeAll(async () => {
          return clientFor(opts.directory)
        },
      }
-      return sdk
+      return () => sdk
    },
  }))

  mock.module("@/context/sync", () => ({
-    useSync: () => ({
+    useSync: () => () => ({
      data: { command: [] },
      session: {
        optimistic: {
@@ -176,7 +184,7 @@ beforeAll(async () => {
  }))

  mock.module("@/context/server-sync", () => ({
-    useServerSync: () => ({
+    useServerSync: () => () => ({
      child: (directory: string) => {
        syncedDirectories.push(directory)
        storedSessions[directory] ??= []
@@ -232,6 +240,7 @@ beforeEach(() => {
 describe("prompt submit worktree selection", () => {
  test("reads the latest worktree accessor value per submit", async () => {
    const submit = createPromptSubmit({
+      prompt,
      info: () => undefined,
      imageAttachments: () => [],
      commentCount: () => 0,
@@ -269,6 +278,7 @@ describe("prompt submit worktree selection", () => {

  test("applies auto-accept to newly created sessions", async () => {
    const submit = createPromptSubmit({
+      prompt,
      info: () => undefined,
      imageAttachments: () => [],
      commentCount: () => 0,
@@ -299,6 +309,7 @@ describe("prompt submit worktree selection", () => {
    variant = "high"

    const submit = createPromptSubmit({
+      prompt,
      info: () => ({ id: "session-1" }),
      imageAttachments: () => [],
      commentCount: () => 0,
@@ -330,6 +341,7 @@ describe("prompt submit worktree selection", () => {

  test("seeds new sessions before optimistic prompts are added", async () => {
    const submit = createPromptSubmit({
+      prompt,
      info: () => undefined,
      imageAttachments: () => [],
      commentCount: () => 0,
@@ -7,14 +7,14 @@ import { batch, type Accessor } from "solid-js"
 import type { FileSelection } from "@/context/file"
 import { useServer } from "@/context/server"
 import { useTabs } from "@/context/tabs"
-import { useServerSync } from "@/context/server-sync"
+import { useServerSync, type ServerSync } from "@/context/server-sync"
 import { useLanguage } from "@/context/language"
 import { useLayout } from "@/context/layout"
 import { useLocal } from "@/context/local"
 import { usePermission } from "@/context/permission"
-import { type ContextItem, type ImageAttachmentPart, type Prompt, usePrompt } from "@/context/prompt"
-import { useSDK } from "@/context/sdk"
-import { useSync } from "@/context/sync"
+import { type ContextItem, type ImageAttachmentPart, type Prompt, type usePrompt } from "@/context/prompt"
+import { useSDK, type DirectorySDK } from "@/context/sdk"
+import { useSync, type DirectorySync } from "@/context/sync"
 import { Identifier } from "@/utils/id"
 import { Worktree as WorktreeState } from "@/utils/worktree"
 import { buildRequestParts } from "./build-request-parts"
@@ -40,9 +40,9 @@ export type FollowupDraft = {
 }

 type FollowupSendInput = {
-  client: ReturnType<typeof useSDK>["client"]
-  serverSync: ReturnType<typeof useServerSync>
-  sync: ReturnType<typeof useSync>
+  client: DirectorySDK["client"]
+  serverSync: ServerSync
+  sync: DirectorySync
  draft: FollowupDraft
  messageID?: string
  optimisticBusy?: boolean
@@ -174,6 +174,7 @@ export async function sendFollowupDraft(input: FollowupSendInput) {
 }

 type PromptSubmitInput = {
+  prompt: ReturnType<typeof usePrompt>
  info: Accessor<{ id: string } | undefined>
  imageAttachments: Accessor<ImageAttachmentPart[]>
  commentCount: Accessor<number>
@@ -211,14 +212,14 @@ export function createPromptSubmit(input: PromptSubmitInput) {
  const serverSync = useServerSync()
  const local = useLocal()
  const permission = usePermission()
-  const prompt = usePrompt()
+  const prompt = input.prompt
  const layout = useLayout()
  const language = useLanguage()
  const params = useParams()
  const [search] = useSearchParams<{ draftId?: string }>()
  const server = useServer()
  const tabs = useTabs()
-  const pendingKey = (sessionID: string) => ScopedKey.from(sdk.scope, sessionID)
+  const pendingKey = (sessionID: string) => ScopedKey.from(sdk().scope, sessionID)

  const errorMessage = (err: unknown) => {
    if (err && typeof err === "object" && "data" in err) {
@@ -233,8 +234,8 @@ export function createPromptSubmit(input: PromptSubmitInput) {
    const sessionID = params.id
    if (!sessionID) return Promise.resolve()

-    serverSync.todo.set(sessionID, [])
-    const [, setStore] = serverSync.child(sdk.directory)
+    serverSync().todo.set(sessionID, [])
+    const [, setStore] = serverSync().child(sdk().directory)
    setStore("todo", sessionID, [])

    input.onAbort?.()
@@ -247,8 +248,8 @@ export function createPromptSubmit(input: PromptSubmitInput) {
      pending.delete(key)
      return Promise.resolve()
    }
-    return sdk.client.session
-      .abort({
+    return sdk()
+      .client.session.abort({
        sessionID,
      })
      .catch(() => {})
@@ -281,7 +282,7 @@ export function createPromptSubmit(input: PromptSubmitInput) {
  }

  const seed = (dir: string, info: Session) => {
-    const [, setStore] = serverSync.child(dir)
+    const [, setStore] = serverSync().child(dir)
    setStore("session", (list: Session[]) => {
      const result = Binary.search(list, info.id, (item) => item.id)
      const next = [...list]
@@ -321,13 +322,13 @@ export function createPromptSubmit(input: PromptSubmitInput) {
    input.addToHistory(currentPrompt, mode)
    input.resetHistoryNavigation()

-    const projectDirectory = sdk.directory
+    const projectDirectory = sdk().directory
    const isNewSession = !params.id
    const shouldAutoAccept = isNewSession && input.autoAccept()
    const worktreeSelection = input.newSessionWorktree?.() || "main"

    let sessionDirectory = projectDirectory
-    let client = sdk.client
+    let client = sdk().client

    if (isNewSession) {
      if (worktreeSelection === "create") {
@@ -349,7 +350,7 @@ export function createPromptSubmit(input: PromptSubmitInput) {
          })
          return
        }
-        WorktreeState.pending(sdk.scope, createdWorktree.directory)
+        WorktreeState.pending(sdk().scope, createdWorktree.directory)
        sessionDirectory = createdWorktree.directory
      }

@@ -358,11 +359,11 @@ export function createPromptSubmit(input: PromptSubmitInput) {
      }

      if (sessionDirectory !== projectDirectory) {
-        client = sdk.createClient({
+        client = sdk().createClient({
          directory: sessionDirectory,
          throwOnError: true,
        })
-        serverSync.child(sessionDirectory)
+        serverSync().child(sessionDirectory)
      }

      input.onNewSessionWorktreeReset?.()
@@ -470,7 +471,7 @@ export function createPromptSubmit(input: PromptSubmitInput) {
    if (text.startsWith("/")) {
      const [cmdName, ...args] = text.split(" ")
      const commandName = cmdName.slice(1)
-      const customCommand = sync.data.command.find((c) => c.name === commandName)
+      const customCommand = sync().data.command.find((c) => c.name === commandName)
      if (customCommand) {
        clearInput()
        client.session
@@ -504,7 +505,7 @@ export function createPromptSubmit(input: PromptSubmitInput) {
    const messageID = Identifier.ascending("message")

    const removeOptimisticMessage = () => {
-      sync.session.optimistic.remove({
+      sync().session.optimistic.remove({
        directory: sessionDirectory,
        sessionID: session.id,
        messageID,
@@ -515,17 +516,17 @@ export function createPromptSubmit(input: PromptSubmitInput) {
    clearInput()

    const waitForWorktree = async () => {
-      const worktree = WorktreeState.get(sdk.scope, sessionDirectory)
+      const worktree = WorktreeState.get(sdk().scope, sessionDirectory)
      if (!worktree || worktree.status !== "pending") return true

      if (sessionDirectory === projectDirectory) {
-        sync.set("session_status", session.id, { type: "busy" })
+        sync().set("session_status", session.id, { type: "busy" })
      }

      const controller = new AbortController()
      const cleanup = () => {
        if (sessionDirectory === projectDirectory) {
-          sync.set("session_status", session.id, { type: "idle" })
+          sync().set("session_status", session.id, { type: "idle" })
        }
        removeOptimisticMessage()
        restoreCommentItems(commentItems)
@@ -559,12 +560,14 @@ export function createPromptSubmit(input: PromptSubmitInput) {
        }, timeoutMs)
      })

-      const result = await Promise.race([WorktreeState.wait(sdk.scope, sessionDirectory), abortWait, timeout]).finally(
-        () => {
-          if (timer.id === undefined) return
-          clearTimeout(timer.id)
-        },
-      )
+      const result = await Promise.race([
+        WorktreeState.wait(sdk().scope, sessionDirectory),
+        abortWait,
+        timeout,
+      ]).finally(() => {
+        if (timer.id === undefined) return
+        clearTimeout(timer.id)
+      })
      pending.delete(pendingKey(session.id))
      if (controller.signal.aborted) return false
      if (result.status === "failed") throw new Error(result.message)
@@ -573,8 +576,8 @@ export function createPromptSubmit(input: PromptSubmitInput) {

    void sendFollowupDraft({
      client,
-      sync,
-      serverSync,
+      sync: sync(),
+      serverSync: serverSync(),
      draft,
      messageID,
      optimisticBusy: sessionDirectory === projectDirectory,
@@ -582,7 +585,7 @@ export function createPromptSubmit(input: PromptSubmitInput) {
    }).catch((err) => {
      pending.delete(pendingKey(session.id))
      if (sessionDirectory === projectDirectory) {
-        sync.set("session_status", session.id, { type: "idle" })
+        sync().set("session_status", session.id, { type: "idle" })
      }
      showToast({
        title: language.t("prompt.toast.promptSendFailed.title"),
@@ -42,7 +42,7 @@ export function SessionContextUsage(props: SessionContextUsageProps) {
    pathFromTab: file.pathFromTab,
    normalizeTab: (tab) => (tab.startsWith("file://") ? file.tab(tab) : tab),
  })
-  const messages = createMemo(() => (params.id ? (sync.data.message[params.id] ?? []) : []))
+  const messages = createMemo(() => (params.id ? (sync().data.message[params.id] ?? []) : []))

  const usd = createMemo(
    () =>
@@ -96,13 +96,13 @@ export function SessionContextTab() {
  const providers = useProviders()
  const { params, view } = useSessionLayout()

-  const info = createMemo(() => (params.id ? sync.session.get(params.id) : undefined))
+  const info = createMemo(() => (params.id ? sync().session.get(params.id) : undefined))

  const messages = createMemo(
    () => {
      const id = params.id
      if (!id) return emptyMessages
-      return (sync.data.message[id] ?? []) as Message[]
+      return (sync().data.message[id] ?? []) as Message[]
    },
    emptyMessages,
    { equals: same },
@@ -180,7 +180,7 @@ export function SessionContextTab() {
        if (!c?.input) return []
        return estimateSessionContextBreakdown({
          messages: messages(),
-          parts: sync.data.part as Record<string, Part[] | undefined>,
+          parts: sync().data.part as Record<string, Part[] | undefined>,
          input: c.input,
          systemPrompt: systemPrompt(),
        })
@@ -221,7 +221,7 @@ export function SessionContextTab() {
  let scroll: HTMLDivElement | undefined
  let frame: number | undefined
  let pending: { x: number; y: number } | undefined
-  const getParts = (id: string) => (sync.data.part[id] ?? []) as Part[]
+  const getParts = (id: string) => (sync().data.part[id] ?? []) as Part[]

  const restoreScroll = () => {
    const el = scroll
@@ -155,11 +155,9 @@ export function SessionHeader() {
  })
  const hotkey = createMemo(() => command.keybind("file.open"))
  const os = createMemo(() => detectOS(platform))
-  const isDesktopV2 = createMemo(() => platform.platform === "desktop" && settings.general.newLayoutDesigns())
-  const search = createMemo(() => (isDesktopV2() ? settings.general.showSearch() : true))
-  const tree = createMemo(() => (isDesktopV2() ? settings.general.showFileTree() : true))
-  const term = createMemo(() => (isDesktopV2() ? settings.general.showTerminal() : true))
-  const status = createMemo(() => (isDesktopV2() ? settings.general.showStatus() : true))
+  const isV2 = settings.general.newLayoutDesigns
+  const search = settings.visibility.search
+  const status = settings.visibility.status

  const [exists, setExists] = createStore<Partial<Record<OpenApp, boolean>>>({
    finder: true,
@@ -231,7 +229,7 @@ export function SessionHeader() {
  )
  const opening = createMemo(() => openRequest.app !== undefined)
  const tint = createMemo(() =>
-    messageAgentColor(params.id ? sync.data.message[params.id] : undefined, sync.data.agent),
+    messageAgentColor(params.id ? sync().data.message[params.id] : undefined, sync().data.agent),
  )
  const v2ActionsState = createMemo<SessionHeaderV2ActionsState>(() => ({
    statusVisible: status(),
@@ -322,7 +320,7 @@ export function SessionHeader() {
        {(mount) => (
          <Portal mount={mount()}>
            <Show
-              when={isDesktopV2}
+              when={isV2}
              fallback={
                <div class="flex items-center gap-2">
                  <Show when={projectDirectory()}>
@@ -444,23 +442,21 @@ export function SessionHeader() {
                        <StatusPopover />
                      </Tooltip>
                    </Show>
-                    <Show when={term()}>
-                      <TooltipKeybind
-                        title={language.t("command.terminal.toggle")}
-                        keybind={command.keybind("terminal.toggle")}
+                    <TooltipKeybind
+                      title={language.t("command.terminal.toggle")}
+                      keybind={command.keybind("terminal.toggle")}
+                    >
+                      <Button
+                        variant="ghost"
+                        class="group/terminal-toggle titlebar-icon w-8 h-6 p-0 box-border shrink-0"
+                        onClick={toggleTerminal}
+                        aria-label={language.t("command.terminal.toggle")}
+                        aria-expanded={view().terminal.opened()}
+                        aria-controls="terminal-panel"
                      >
-                        <Button
-                          variant="ghost"
-                          class="group/terminal-toggle titlebar-icon w-8 h-6 p-0 box-border shrink-0"
-                          onClick={toggleTerminal}
-                          aria-label={language.t("command.terminal.toggle")}
-                          aria-expanded={view().terminal.opened()}
-                          aria-controls="terminal-panel"
-                        >
-                          <Icon size="small" name={view().terminal.opened() ? "terminal-active" : "terminal"} />
-                        </Button>
-                      </TooltipKeybind>
-                    </Show>
+                        <Icon size="small" name={view().terminal.opened() ? "terminal-active" : "terminal"} />
+                      </Button>
+                    </TooltipKeybind>

                    <div class="hidden md:flex items-center gap-1 shrink-0">
                      <TooltipKeybind
@@ -479,32 +475,30 @@ export function SessionHeader() {
                        </Button>
                      </TooltipKeybind>

-                      <Show when={tree()}>
-                        <TooltipKeybind
-                          title={language.t("command.fileTree.toggle")}
-                          keybind={command.keybind("fileTree.toggle")}
+                      <TooltipKeybind
+                        title={language.t("command.fileTree.toggle")}
+                        keybind={command.keybind("fileTree.toggle")}
+                      >
+                        <Button
+                          variant="ghost"
+                          class="titlebar-icon w-8 h-6 p-0 box-border"
+                          onClick={() => layout.fileTree.toggle()}
+                          aria-label={language.t("command.fileTree.toggle")}
+                          aria-expanded={layout.fileTree.opened()}
+                          aria-controls="file-tree-panel"
                        >
-                          <Button
-                            variant="ghost"
-                            class="titlebar-icon w-8 h-6 p-0 box-border"
-                            onClick={() => layout.fileTree.toggle()}
-                            aria-label={language.t("command.fileTree.toggle")}
-                            aria-expanded={layout.fileTree.opened()}
-                            aria-controls="file-tree-panel"
-                          >
-                            <div class="relative flex items-center justify-center size-4">
-                              <Icon
-                                size="small"
-                                name={layout.fileTree.opened() ? "file-tree-active" : "file-tree"}
-                                classList={{
-                                  "text-icon-strong": layout.fileTree.opened(),
-                                  "text-icon-weak": !layout.fileTree.opened(),
-                                }}
-                              />
-                            </div>
-                          </Button>
-                        </TooltipKeybind>
-                      </Show>
+                          <div class="relative flex items-center justify-center size-4">
+                            <Icon
+                              size="small"
+                              name={layout.fileTree.opened() ? "file-tree-active" : "file-tree"}
+                              classList={{
+                                "text-icon-strong": layout.fileTree.opened(),
+                                "text-icon-weak": !layout.fileTree.opened(),
+                              }}
+                            />
+                          </div>
+                        </Button>
+                      </TooltipKeybind>
                    </div>
                  </div>
                </div>
@@ -20,24 +20,24 @@ export function NewSessionView(props: NewSessionViewProps) {
  const sdk = useSDK()
  const language = useLanguage()

-  const sandboxes = createMemo(() => sync.project?.sandboxes ?? [])
+  const sandboxes = createMemo(() => sync().project?.sandboxes ?? [])
  const options = createMemo(() => [MAIN_WORKTREE, ...sandboxes(), CREATE_WORKTREE])
  const current = createMemo(() => {
    const selection = props.worktree
    if (options().includes(selection)) return selection
    return MAIN_WORKTREE
  })
-  const projectRoot = createMemo(() => sync.project?.worktree ?? sdk.directory)
+  const projectRoot = createMemo(() => sync().project?.worktree ?? sdk().directory)
  const isWorktree = createMemo(() => {
-    const project = sync.project
+    const project = sync().project
    if (!project) return false
-    return sdk.directory !== project.worktree
+    return sdk().directory !== project.worktree
  })

  const label = (value: string) => {
    if (value === MAIN_WORKTREE) {
      if (isWorktree()) return language.t("session.new.worktree.main")
-      const branch = sync.data.vcs?.branch
+      const branch = sync().data.vcs?.branch
      if (branch) return language.t("session.new.worktree.mainWithBranch", { branch })
      return language.t("session.new.worktree.main")
    }
@@ -69,7 +69,7 @@ export function NewSessionView(props: NewSessionViewProps) {
                {label(current())}
              </div>
            </div>
-            <Show when={sync.project}>
+            <Show when={sync().project}>
              {(project) => (
                <div class="flex items-start justify-center gap-3 min-h-5">
                  <div class="text-12-medium text-text-weak leading-5 min-w-0 max-w-160 break-words text-center">
@@ -127,8 +127,8 @@ export const SettingsGeneral: Component = () => {

  const [shells] = createResource(
    () =>
-      serverSdk.client.pty
-        .shells()
+      serverSdk()
+        .client.pty.shells()
        .then((res) => res.data ?? [])
        .catch(() => [] as ShellOption[]),
    { initialValue: [] as ShellOption[] },
@@ -151,11 +151,11 @@ export const SettingsGeneral: Component = () => {
  })

  const autoOption = { id: "auto", value: "", label: language.t("settings.general.row.shell.autoDefault") }
-  const currentShell = createMemo(() => serverSync.data.config.shell ?? "")
+  const currentShell = createMemo(() => serverSync().data.config.shell ?? "")

  const shellOptions = createMemo<ShellSelectOption[]>(() => {
    const list = shells.latest
-    const current = serverSync.data.config.shell
+    const current = serverSync().data.config.shell

    const nameCounts = new Map<string, number>()
    for (const s of list) {
@@ -290,7 +290,7 @@ export const SettingsGeneral: Component = () => {
            onSelect={(option) => {
              if (!option) return
              if (option.value === currentShell()) return
-              serverSync.updateConfig({ shell: option.value })
+              serverSync().updateConfig({ shell: option.value })
            }}
            variant="secondary"
            size="small"
@@ -83,7 +83,7 @@ const SettingsProvidersContent: Component = () => {
  const note = (id: string) => PROVIDER_NOTES.find((item) => item.match(id))?.key

  const isConfigCustom = (providerID: string) => {
-    const provider = serverSync.data.config.provider?.[providerID]
+    const provider = serverSync().data.config.provider?.[providerID]
    if (!provider) return false
    if (provider.npm !== "@ai-sdk/openai-compatible") return false
    if (!provider.models || Object.keys(provider.models).length === 0) return false
@@ -91,11 +91,11 @@ const SettingsProvidersContent: Component = () => {
  }

  const disableProvider = async (providerID: string, name: string) => {
-    const before = serverSync.data.config.disabled_providers ?? []
+    const before = serverSync().data.config.disabled_providers ?? []
    const next = before.includes(providerID) ? before : [...before, providerID]
-    serverSync.set("config", "disabled_providers", next)
+    serverSync().set("config", "disabled_providers", next)

-    await serverSync
+    await serverSync()
      .updateConfig({ disabled_providers: next })
      .then(() => {
        showToast({
@@ -106,7 +106,7 @@ const SettingsProvidersContent: Component = () => {
        })
      })
      .catch((err: unknown) => {
-        serverSync.set("config", "disabled_providers", before)
+        serverSync().set("config", "disabled_providers", before)
        const message = err instanceof Error ? err.message : String(err)
        showToast({ title: language.t("common.requestFailed"), description: message })
      })
@@ -114,14 +114,16 @@ const SettingsProvidersContent: Component = () => {

  const disconnect = async (providerID: string, name: string) => {
    if (isConfigCustom(providerID)) {
-      await serverSDK.client.auth.remove({ providerID }).catch(() => undefined)
+      await serverSDK()
+        .client.auth.remove({ providerID })
+        .catch(() => undefined)
      await disableProvider(providerID, name)
      return
    }
-    await serverSDK.client.auth
-      .remove({ providerID })
+    await serverSDK()
+      .client.auth.remove({ providerID })
      .then(async () => {
-        await serverSDK.client.global.dispose()
+        await serverSDK().client.global.dispose()
        showToast({
          variant: "success",
          icon: "circle-check",
@@ -30,7 +30,7 @@ function SettingsServerDataProviders(props: ParentProps<{ server: ServerConnecti

  return (
    <QueryClientProvider client={serverCtx().queryClient}>
-      <ServerSDKProvider server={props.server}>
+      <ServerSDKProvider server={() => props.server}>
        <ServerSyncProvider>
          <ModelsProvider>{props.children}</ModelsProvider>
        </ServerSyncProvider>
@@ -1,16 +1,14 @@
 import { Component, Show, createMemo, createResource, onMount } from "solid-js"
 import { ButtonV2 } from "@opencode-ai/ui/v2/button-v2"
-import { Icon } from "@opencode-ai/ui/icon"
 import { SelectV2 } from "@opencode-ai/ui/v2/select-v2"
 import { Switch } from "@opencode-ai/ui/v2/switch-v2"
 import { TextInputV2 } from "@opencode-ai/ui/v2/text-input-v2"
-import { Tooltip } from "@opencode-ai/ui/tooltip"
 import { useTheme, type ColorScheme } from "@opencode-ai/ui/theme/context"
 import { useDialog } from "@opencode-ai/ui/context/dialog"
 import { useParams } from "@solidjs/router"
 import { useLanguage } from "@/context/language"
 import { usePermission } from "@/context/permission"
-import { usePlatform, type DisplayBackend } from "@/context/platform"
+import { usePlatform } from "@/context/platform"
 import { useServerSync } from "@/context/server-sync"
 import { useServerSDK } from "@/context/server-sdk"
 import { useUpdaterAction } from "../updater-action"
@@ -94,7 +92,6 @@ export const SettingsGeneralV2: Component = () => {

  const updater = useUpdaterAction()

-  const linux = createMemo(() => platform.platform === "desktop" && platform.os === "linux")
  const dir = createMemo(() => decode64(params.dir))
  const accepting = createMemo(() => {
    const value = dir()
@@ -129,19 +126,13 @@ export const SettingsGeneralV2: Component = () => {

  const [shells] = createResource(
    () =>
-      serverSdk.client.pty
-        .shells()
+      serverSdk()
+        .client.pty.shells()
        .then((res) => res.data ?? [])
        .catch(() => [] as ShellOption[]),
    { initialValue: [] as ShellOption[] },
  )

-  const [displayBackend, { refetch: refetchDisplayBackend }] = createResource(
-    () => (linux() && platform.getDisplayBackend ? true : false),
-    () => Promise.resolve(platform.getDisplayBackend?.() ?? null).catch(() => null as DisplayBackend | null),
-    { initialValue: null as DisplayBackend | null },
-  )
-
  const [pinchZoom, { mutate: setPinchZoom }] = createResource(
    () => (desktop() && platform.getPinchZoomEnabled ? true : false),
    () => Promise.resolve(platform.getPinchZoomEnabled?.() ?? false).catch(() => false),
@@ -153,11 +144,11 @@ export const SettingsGeneralV2: Component = () => {
  })

  const autoOption = { id: "auto", value: "", label: language.t("settings.general.row.shell.autoDefault") }
-  const currentShell = createMemo(() => serverSync.data.config.shell ?? "")
+  const currentShell = createMemo(() => serverSync().data.config.shell ?? "")

  const shellOptions = createMemo<ShellSelectOption[]>(() => {
    const list = shells.latest
-    const current = serverSync.data.config.shell
+    const current = serverSync().data.config.shell

    const nameCounts = new Map<string, number>()
    for (const s of list) {
@@ -186,14 +177,6 @@ export const SettingsGeneralV2: Component = () => {
    return options
  })

-  const onDisplayBackendChange = (checked: boolean) => {
-    const update = platform.setDisplayBackend?.(checked ? "wayland" : "auto")
-    if (!update) return
-    void update.finally(() => {
-      void refetchDisplayBackend()
-    })
-  }
-
  const onPinchZoomChange = (checked: boolean) => {
    setPinchZoom(checked)
    const update = platform.setPinchZoomEnabled?.(checked)
@@ -292,7 +275,7 @@ export const SettingsGeneralV2: Component = () => {
            onSelect={(option) => {
              if (!option) return
              if (option.value === currentShell()) return
-              serverSync.updateConfig({ shell: option.value })
+              serverSync().updateConfig({ shell: option.value })
            }}
          />
        </SettingsRowV2>
@@ -383,18 +366,6 @@ export const SettingsGeneralV2: Component = () => {
          </div>
        </SettingsRowV2>

-        <SettingsRowV2
-          title={language.t("settings.general.row.showNavigation.title")}
-          description={language.t("settings.general.row.showNavigation.description")}
-        >
-          <div data-action="settings-show-navigation">
-            <Switch
-              checked={settings.general.showNavigation()}
-              onChange={(checked) => settings.general.setShowNavigation(checked)}
-            />
-          </div>
-        </SettingsRowV2>
-
        <SettingsRowV2
          title={language.t("settings.general.row.showSearch.title")}
          description={language.t("settings.general.row.showSearch.description")}
@@ -407,18 +378,6 @@ export const SettingsGeneralV2: Component = () => {
          </div>
        </SettingsRowV2>

-        <SettingsRowV2
-          title={language.t("settings.general.row.showTerminal.title")}
-          description={language.t("settings.general.row.showTerminal.description")}
-        >
-          <div data-action="settings-show-terminal">
-            <Switch
-              checked={settings.general.showTerminal()}
-              onChange={(checked) => settings.general.setShowTerminal(checked)}
-            />
-          </div>
-        </SettingsRowV2>
-
        <SettingsRowV2
          title={language.t("settings.general.row.showStatus.title")}
          description={language.t("settings.general.row.showStatus.description")}
@@ -709,6 +668,7 @@ export const SettingsGeneralV2: Component = () => {
    </div>
  )

+  // We can probably remove this, right?
  const DisplaySection = () => (
    <Show when={desktop()}>
      <div class="settings-v2-section">
@@ -723,26 +683,6 @@ export const SettingsGeneralV2: Component = () => {
              <Switch checked={pinchZoom.latest} onChange={onPinchZoomChange} />
            </div>
          </SettingsRowV2>
-
-          <Show when={linux()}>
-            <SettingsRowV2
-              title={
-                <div class="flex items-center gap-2">
-                  <span>{language.t("settings.general.row.wayland.title")}</span>
-                  <Tooltip value={language.t("settings.general.row.wayland.tooltip")} placement="top">
-                    <span class="text-text-weak">
-                      <Icon name="help" size="small" />
-                    </span>
-                  </Tooltip>
-                </div>
-              }
-              description={language.t("settings.general.row.wayland.description")}
-            >
-              <div data-action="settings-wayland">
-                <Switch checked={displayBackend.latest === "wayland"} onChange={onDisplayBackendChange} />
-              </div>
-            </SettingsRowV2>
-          </Show>
        </SettingsListV2>
      </div>
    </Show>
@@ -763,13 +703,13 @@ export const SettingsGeneralV2: Component = () => {

        <SoundsSection />

-        <UpdatesSection />
+        <Show when={desktop()}>
+          <UpdatesSection />
+        </Show>

        <DisplaySection />

-        <Show when={desktop()}>
-          <AdvancedSection />
-        </Show>
+        <AdvancedSection />
      </div>
    </>
  )
@@ -77,7 +77,7 @@ export const SettingsProvidersV2: Component = () => {
  const note = (id: string) => PROVIDER_NOTES.find((item) => item.match(id))?.key

  const isConfigCustom = (providerID: string) => {
-    const provider = serverSync.data.config.provider?.[providerID]
+    const provider = serverSync().data.config.provider?.[providerID]
    if (!provider) return false
    if (provider.npm !== "@ai-sdk/openai-compatible") return false
    if (!provider.models || Object.keys(provider.models).length === 0) return false
@@ -85,11 +85,11 @@ export const SettingsProvidersV2: Component = () => {
  }

  const disableProvider = async (providerID: string, name: string) => {
-    const before = serverSync.data.config.disabled_providers ?? []
+    const before = serverSync().data.config.disabled_providers ?? []
    const next = before.includes(providerID) ? before : [...before, providerID]
-    serverSync.set("config", "disabled_providers", next)
+    serverSync().set("config", "disabled_providers", next)

-    await serverSync
+    await serverSync()
      .updateConfig({ disabled_providers: next })
      .then(() => {
        showToast({
@@ -100,7 +100,7 @@ export const SettingsProvidersV2: Component = () => {
        })
      })
      .catch((err: unknown) => {
-        serverSync.set("config", "disabled_providers", before)
+        serverSync().set("config", "disabled_providers", before)
        const message = err instanceof Error ? err.message : String(err)
        showToast({ title: language.t("common.requestFailed"), description: message })
      })
@@ -108,14 +108,16 @@ export const SettingsProvidersV2: Component = () => {

  const disconnect = async (providerID: string, name: string) => {
    if (isConfigCustom(providerID)) {
-      await serverSdk.client.auth.remove({ providerID }).catch(() => undefined)
+      await serverSdk()
+        .client.auth.remove({ providerID })
+        .catch(() => undefined)
      await disableProvider(providerID, name)
      return
    }
-    await serverSdk.client.auth
-      .remove({ providerID })
+    await serverSdk()
+      .client.auth.remove({ providerID })
      .then(async () => {
-        await serverSdk.client.global.dispose()
+        await serverSdk().client.global.dispose()
        showToast({
          variant: "success",
          icon: "circle-check",
@@ -279,13 +279,13 @@ export function StatusPopoverBody(props: { shown: Accessor<boolean> }) {
  const sortedServers = createMemo(() => listServersByHealth(global.servers.list(), server.key, global.servers.health))
  const toggleMcp = useMcpToggle()
  const defaultServer = useDefaultServerKey(platform.getDefaultServer)
-  const mcpNames = createMemo(() => Object.keys(sync.data.mcp ?? {}).sort((a, b) => a.localeCompare(b)))
-  const mcpStatus = (name: string) => sync.data.mcp?.[name]?.status
+  const mcpNames = createMemo(() => Object.keys(sync().data.mcp ?? {}).sort((a, b) => a.localeCompare(b)))
+  const mcpStatus = (name: string) => sync().data.mcp?.[name]?.status
  const mcpConnected = createMemo(() => mcpNames().filter((name) => mcpStatus(name) === "connected").length)
-  const lspItems = createMemo(() => sync.data.lsp ?? [])
+  const lspItems = createMemo(() => sync().data.lsp ?? [])
  const lspCount = createMemo(() => lspItems().length)
  const plugins = createMemo(() =>
-    (sync.data.config.plugin ?? []).map((item) => (typeof item === "string" ? item : item[0])),
+    (sync().data.config.plugin ?? []).map((item) => (typeof item === "string" ? item : item[0])),
  )
  const pluginCount = createMemo(() => plugins().length)
  const pluginEmpty = createMemo(() => pluginEmptyMessage(language.t("dialog.plugins.empty"), "opencode.json"))
@@ -18,9 +18,9 @@ export function StatusPopover() {
  const global = useGlobal()
  const sync = useSync()
  const [shown, setShown] = createSignal(false)
-  const ready = createMemo(() => global.servers.health[server.key]?.healthy === false || sync.data.mcp_ready)
+  const ready = createMemo(() => global.servers.health[server.key]?.healthy === false || sync().data.mcp_ready)
  const mcpIssue = createMemo(() => {
-    const mcp = Object.values(sync.data.mcp ?? {})
+    const mcp = Object.values(sync().data.mcp ?? {})
    const failed = mcp.some((item) => item.status === "failed" || item.status === "needs_client_registration")
    const warn = mcp.some((item) => item.status === "needs_auth")
    if (failed) return "critical" as const
@@ -86,9 +86,9 @@ function DirectoryStatusPopover() {
  const sync = useSync()
  const [shown, setShown] = createSignal(false)
  const serverHealth = () => global.servers.health[server.key]?.healthy
-  const ready = createMemo(() => serverHealth() === false || sync.data.mcp_ready)
+  const ready = createMemo(() => serverHealth() === false || sync().data.mcp_ready)
  const mcpIssue = createMemo(() => {
-    const mcp = Object.values(sync.data.mcp ?? {})
+    const mcp = Object.values(sync().data.mcp ?? {})
    const failed = mcp.some((item) => item.status === "failed" || item.status === "needs_client_registration")
    const warn = mcp.some((item) => item.status === "needs_auth")
    if (failed) return "critical" as const
@@ -161,9 +161,9 @@ export const Terminal = (props: TerminalProps) => {
  const theme = useTheme()
  const language = useLanguage()
  const server = useServer()
-  const directory = sdk.directory
-  const client = sdk.client
-  const url = sdk.url
+  const directory = sdk().directory
+  const client = sdk().client
+  const url = sdk().url
  const auth = server.current?.http
  const username = auth?.username ?? "opencode"
  const password = auth?.password ?? ""
@@ -0,0 +1,46 @@
+@keyframes titlebar-tab-fade-left {
+  from {
+    visibility: hidden;
+  }
+  to {
+    visibility: visible;
+  }
+}
+
+@keyframes titlebar-tab-fade-right {
+  from {
+    visibility: visible;
+  }
+  to {
+    visibility: hidden;
+  }
+}
+
+/* The narrow ranges preserve the binary thresholds of scrollLeft > 0 and
+   remaining scroll distance > 1px. Hidden defaults make an inactive timeline
+   (no overflow) a no-op. Unsupported browsers also degrade to no fades. */
+[data-slot="titlebar-tabs"] {
+  timeline-scope: --titlebar-tabs-scroll;
+
+  [data-slot^="titlebar-tabs-fade-"] {
+    visibility: hidden;
+  }
+}
+
+@supports (animation-timeline: --titlebar-tabs-scroll) and (timeline-scope: --titlebar-tabs-scroll) {
+  [data-slot="titlebar-tabs-scroll"] {
+    scroll-timeline: --titlebar-tabs-scroll x;
+  }
+
+  [data-slot="titlebar-tabs-fade-left"] {
+    animation: titlebar-tab-fade-left linear both;
+    animation-timeline: --titlebar-tabs-scroll;
+    animation-range: 0 0.1px;
+  }
+
+  [data-slot="titlebar-tabs-fade-right"] {
+    animation: titlebar-tab-fade-right linear both;
+    animation-timeline: --titlebar-tabs-scroll;
+    animation-range: calc(100% - 1.1px) calc(100% - 1px);
+  }
+}
@@ -7,12 +7,11 @@ import {
  Match,
  onMount,
  Show,
-  startTransition,
  Switch,
  untrack,
 } from "solid-js"
 import { createStore } from "solid-js/store"
-import { useLocation, useMatch, useNavigate, useParams } from "@solidjs/router"
+import { useLocation, useNavigate, useParams } from "@solidjs/router"
 import { IconButton } from "@opencode-ai/ui/icon-button"
 import { Icon } from "@opencode-ai/ui/icon"
 import { Button } from "@opencode-ai/ui/button"
@@ -20,6 +19,8 @@ import { Tooltip, TooltipKeybind } from "@opencode-ai/ui/tooltip"
 import { useTheme } from "@opencode-ai/ui/theme/context"
 import { IconButtonV2 } from "@opencode-ai/ui/v2/icon-button-v2"
 import { Icon as IconV2 } from "@opencode-ai/ui/v2/icon"
+import { KeybindV2 } from "@opencode-ai/ui/v2/keybind-v2"
+import { TooltipV2 } from "@opencode-ai/ui/v2/tooltip-v2"

 import { getProjectAvatarVariant, LayoutRoute, useLayout, type LocalProject } from "@/context/layout"
 import { usePlatform } from "@/context/platform"
@@ -34,11 +35,13 @@ import { ProjectAvatar } from "@opencode-ai/ui/v2/project-avatar-v2"
 import { displayName, getProjectAvatarSource, projectForSession } from "@/pages/layout/helpers"
 import { useSessionTabAvatarState } from "@/pages/layout/project-avatar-state"
 import { makeEventListener } from "@solid-primitives/event-listener"
+import { createResizeObserver } from "@solid-primitives/resize-observer"
 import { readSessionTabsRemovedDetail, SESSION_TABS_REMOVED_EVENT } from "@/components/titlebar-session-events"
 import { useGlobal } from "@/context/global"
 import { decode64 } from "@/utils/base64"
 import { ServerConnection, useServer } from "@/context/server"
 import { tabHref, useTabs, type Tab } from "@/context/tabs"
+import "./titlebar.css"

 type TauriDesktopWindow = {
  startDragging?: () => Promise<void>
@@ -251,7 +254,6 @@ export function Titlebar(props: { update?: TitlebarUpdate }) {
          {(_) => {
            const serverSync = useServerSync()
            const navigate = useNavigate()
-            const homeMatch = useMatch(() => "/")
            const layout = useLayout()

            const newSessionHref = () => {
@@ -266,17 +268,6 @@ export function Titlebar(props: { update?: TitlebarUpdate }) {
            const tabs = useTabs()
            const tabsStore = tabs.store
            const tabsStoreActions = tabs
-            const navigateTab = (tab: Tab) => {
-              const href = tabHref(tab)
-              if (tab.server === server.key) {
-                navigate(href)
-                return
-              }
-              void startTransition(() => {
-                server.setActive(tab.server)
-                navigate(href)
-              })
-            }

            const matchRoute = (route: LayoutRoute) => {
              if (route.type === "home") return
@@ -289,7 +280,7 @@ export function Titlebar(props: { update?: TitlebarUpdate }) {
                    item.type === "session" && item.server === route.server && item.sessionId === route.sessionId,
                )
                if (main) return main
-                const sync = serverSync.createDirSyncContext(route.dir)
+                const sync = serverSync().createDirSyncContext(route.dir)
                const session = sync.session.get(route.sessionId)
                if (session?.parentID) {
                  const parentID = session.parentID
@@ -307,10 +298,13 @@ export function Titlebar(props: { update?: TitlebarUpdate }) {
              const route = layout.route()
              if (!tabs.ready()) return
              const tab = currentTab()
-              if (tab) return
+              if (tab) {
+                tabs.remember(tab)
+                return
+              }

              if (route.type === "session") {
-                const sync = serverSync.createDirSyncContext(route.dir)
+                const sync = serverSync().createDirSyncContext(route.dir)
                const session = sync.session.get(route.sessionId)
                if (!session) return
                const sessionId = session.parentID ?? session.id
@@ -330,6 +324,18 @@ export function Titlebar(props: { update?: TitlebarUpdate }) {
            })

            const openNewTab = () => navigate(newSessionHref())
+            const toggleHome = () => tabs.toggleHome({ home: layout.route().type === "home", current: currentTab() })
+
+            command.register("titlebar-home", () => [
+              {
+                id: "home.toggle",
+                title: language.t("home.title"),
+                category: language.t("command.category.view"),
+                keybind: "mod+b",
+                hidden: true,
+                onSelect: toggleHome,
+              },
+            ])

            command.register("tabs", () => {
              const current = currentTab()
@@ -367,7 +373,7 @@ export function Titlebar(props: { update?: TitlebarUpdate }) {
                    if (index === -1) index = tabsStore.length - 1

                    const next = tabsStore[index]
-                    if (next) navigateTab(next)
+                    if (next) tabs.select(next)
                  },
                },
                {
@@ -384,7 +390,7 @@ export function Titlebar(props: { update?: TitlebarUpdate }) {
                    if (index === tabsStore.length) index = 0

                    const next = tabsStore[index]
-                    if (next) navigateTab(next)
+                    if (next) tabs.select(next)
                  },
                },
                ...Array.from({ length: 9 }, (_, i) => {
@@ -399,7 +405,7 @@ export function Titlebar(props: { update?: TitlebarUpdate }) {
                    hidden: true,
                    onSelect: () => {
                      const tab = tabsStore[index]
-                      if (tab) navigateTab(tab)
+                      if (tab) tabs.select(tab)
                    },
                  }
                }),
@@ -425,102 +431,130 @@ export function Titlebar(props: { update?: TitlebarUpdate }) {
                <Show when={windows() || linux()}>
                  <WindowsAppMenu command={command} platform={platform} variant="v2" />
                </Show>
-                <IconButtonV2
-                  variant="ghost-muted"
-                  size="large"
-                  as="a"
-                  href="/"
-                  class="!w-9 shrink-0"
-                  icon={<IconV2 name="grid-plus" />}
-                  state={!!homeMatch() ? "pressed" : undefined}
-                />
-
-                <div
-                  class="flex min-w-0 flex-row items-center gap-1.5 overflow-x-auto no-scrollbar [app-region:no-drag]"
-                  ref={tabScrollRef}
+                <TooltipV2
+                  placement="bottom"
+                  value={
+                    <>
+                      {language.t("home.title")}
+                      <KeybindV2 keys={command.keybindParts("home.toggle")} variant="neutral" />
+                    </>
+                  }
+                  class="shrink-0"
                >
-                  <div class="flex min-w-0 flex-row items-center gap-1.5">
-                    <For each={tabsStore}>
-                      {(tab, i) => {
-                        let ref!: HTMLDivElement
+                  <IconButtonV2
+                    type="button"
+                    variant="ghost-muted"
+                    size="large"
+                    class="!w-9 shrink-0"
+                    icon={<IconV2 name="grid-plus" />}
+                    state={layout.route().type === "home" ? "pressed" : undefined}
+                    onClick={toggleHome}
+                    aria-label={language.t("home.title")}
+                    aria-pressed={layout.route().type === "home"}
+                  />
+                </TooltipV2>

-                        onMount(() => {
-                          refreshTabsAreOverflowing()
-                        })
+                <div data-slot="titlebar-tabs" class="relative min-w-0">
+                  <div
+                    data-slot="titlebar-tabs-scroll"
+                    class="flex min-w-0 flex-row items-center gap-1.5 overflow-x-auto no-scrollbar [app-region:no-drag]"
+                    ref={(el) => {
+                      tabScrollRef = el
+                      createResizeObserver(el, refreshTabsAreOverflowing)
+                    }}
+                  >
+                    <div
+                      class="flex min-w-0 flex-row items-center gap-1.5"
+                      ref={(el) => createResizeObserver(el, refreshTabsAreOverflowing)}
+                    >
+                      <For each={tabsStore}>
+                        {(tab, i) => {
+                          let ref!: HTMLDivElement

-                        const divider = () =>
-                          i() !== 0 && (
-                            <div class="w-[1.5px] h-3 shrink-0 rounded-full bg-[var(--v2-background-bg-layer-02)]" />
-                          )
+                          const divider = () =>
+                            i() !== 0 && (
+                              <div class="w-[1.5px] h-3 shrink-0 rounded-full bg-[var(--v2-background-bg-layer-02)]" />
+                            )
+
+                          if (tab.type === "draft") {
+                            return (
+                              <>
+                                {divider()}
+                                <DraftTabItem
+                                  ref={ref}
+                                  href={tabHref(tab)}
+                                  title={language.t("command.session.new")}
+                                  active={currentTab() === tab}
+                                  onNavigate={() => {
+                                    tabs.select(tab)
+                                    ref.scrollIntoView({ behavior: "instant" })
+                                  }}
+                                  onClose={() => tabsStoreActions.removeTab(i())}
+                                />
+                              </>
+                            )
+                          }

-                        if (tab.type === "draft") {
                          return (
                            <>
                              {divider()}
-                              <DraftTabItem
+                              <TabNavItem
                                ref={ref}
                                href={tabHref(tab)}
-                                title={language.t("command.session.new")}
-                                active={currentTab() === tab}
+                                server={tab.server}
+                                directory={decode64(tab.dirBase64)!}
+                                sessionId={tab.sessionId}
                                onNavigate={() => {
-                                  navigateTab(tab)
+                                  tabs.select(tab)
+
                                  ref.scrollIntoView({ behavior: "instant" })
                                }}
                                onClose={() => tabsStoreActions.removeTab(i())}
+                                active={currentTab() === tab}
+                                activeServer={tab.server === server.key}
+                                forceTruncate={tabsAreOverflowing()}
                              />
                            </>
                          )
-                        }
+                        }}
+                      </For>
+                      <Show when={creating() && params.dir}>
+                        {(_) => {
+                          let ref!: HTMLDivElement

-                        return (
-                          <>
-                            {divider()}
-                            <TabNavItem
-                              ref={ref}
-                              href={tabHref(tab)}
-                              server={tab.server}
-                              directory={decode64(tab.dirBase64)!}
-                              sessionId={tab.sessionId}
-                              onNavigate={() => {
-                                navigateTab(tab)
+                          onMount(() => {
+                            ref.scrollIntoView({ behavior: "instant" })
+                          })

-                                ref.scrollIntoView({ behavior: "instant" })
-                              }}
-                              onClose={() => tabsStoreActions.removeTab(i())}
-                              active={currentTab() === tab}
-                              activeServer={tab.server === server.key}
-                              forceTruncate={tabsAreOverflowing()}
-                            />
-                          </>
-                        )
-                      }}
-                    </For>
-                    <Show when={creating() && params.dir}>
-                      {(_) => {
-                        let ref!: HTMLDivElement
-
-                        onMount(() => {
-                          ref.scrollIntoView({ behavior: "instant" })
-                        })
-
-                        return (
-                          <>
-                            <div class="w-[1.5px] h-3 shrink-0 rounded-full bg-[var(--v2-background-bg-layer-02)]" />
-                            <NewSessionTabItem
-                              ref={ref}
-                              href={`/${params.dir}/session`}
-                              title={language.t("command.session.new")}
-                              onClose={() => {
-                                const tab = tabsStore.at(-1)
-                                if (tab) navigateTab(tab)
-                                else navigate("/")
-                              }}
-                            />
-                          </>
-                        )
-                      }}
-                    </Show>
+                          return (
+                            <>
+                              <div class="w-[1.5px] h-3 shrink-0 rounded-full bg-[var(--v2-background-bg-layer-02)]" />
+                              <NewSessionTabItem
+                                ref={ref}
+                                href={`/${params.dir}/session`}
+                                title={language.t("command.session.new")}
+                                onClose={() => {
+                                  const tab = tabsStore.at(-1)
+                                  if (tab) tabs.select(tab)
+                                  else navigate("/")
+                                }}
+                              />
+                            </>
+                          )
+                        }}
+                      </Show>
+                    </div>
                  </div>
+                  <div
+                    data-slot="titlebar-tabs-fade-left"
+                    aria-hidden="true"
+                    class="pointer-events-none absolute inset-y-0 left-0 z-10 w-6 bg-[linear-gradient(to_right,var(--v2-background-bg-deep),transparent)]"
+                  />
+                  <div
+                    data-slot="titlebar-tabs-fade-right"
+                    aria-hidden="true"
+                    class="pointer-events-none absolute inset-y-0 right-0 z-10 w-6 bg-[linear-gradient(to_left,var(--v2-background-bg-deep),transparent)]"
+                  />
                </div>
                <Show when={!(creating() && params.dir)}>
                  <IconButtonV2
@@ -170,13 +170,7 @@ export function matchKeybind(keybinds: Keybind[], event: KeyboardEvent): boolean
  return false
 }

-export function formatKeybind(config: string, t?: (key: KeyLabel) => string): string {
-  if (!config || config === "none") return ""
-
-  const keybinds = parseKeybind(config)
-  if (keybinds.length === 0) return ""
-
-  const kb = keybinds[0]
+function displayKeybindParts(kb: Keybind, t?: (key: KeyLabel) => string) {
  const parts: string[] = []

  if (kb.ctrl) parts.push(IS_MAC ? "⌃" : keyText("common.key.ctrl", t))
@@ -184,40 +178,52 @@ export function formatKeybind(config: string, t?: (key: KeyLabel) => string): st
  if (kb.shift) parts.push(IS_MAC ? "⇧" : keyText("common.key.shift", t))
  if (kb.meta) parts.push(IS_MAC ? "⌘" : keyText("common.key.meta", t))

-  if (kb.key) {
-    const keys: Record<string, string> = {
-      arrowup: "↑",
-      arrowdown: "↓",
-      arrowleft: "←",
-      arrowright: "→",
-      comma: ",",
-      plus: "+",
-    }
-    const named: Record<string, KeyLabel> = {
-      backspace: "common.key.backspace",
-      delete: "common.key.delete",
-      end: "common.key.end",
-      enter: "common.key.enter",
-      esc: "common.key.esc",
-      escape: "common.key.esc",
-      home: "common.key.home",
-      insert: "common.key.insert",
-      pagedown: "common.key.pageDown",
-      pageup: "common.key.pageUp",
-      space: "common.key.space",
-      tab: "common.key.tab",
-    }
-    const key = kb.key.toLowerCase()
-    const displayKey =
-      keys[key] ??
-      (named[key]
-        ? keyText(named[key], t)
-        : key.length === 1
-          ? key.toUpperCase()
-          : key.charAt(0).toUpperCase() + key.slice(1))
-    parts.push(displayKey)
-  }
+  if (!kb.key) return parts

+  const keys: Record<string, string> = {
+    arrowup: "↑",
+    arrowdown: "↓",
+    arrowleft: "←",
+    arrowright: "→",
+    comma: ",",
+    plus: "+",
+  }
+  const named: Record<string, KeyLabel> = {
+    backspace: "common.key.backspace",
+    delete: "common.key.delete",
+    end: "common.key.end",
+    enter: "common.key.enter",
+    esc: "common.key.esc",
+    escape: "common.key.esc",
+    home: "common.key.home",
+    insert: "common.key.insert",
+    pagedown: "common.key.pageDown",
+    pageup: "common.key.pageUp",
+    space: "common.key.space",
+    tab: "common.key.tab",
+  }
+  const key = kb.key.toLowerCase()
+  const displayKey =
+    keys[key] ??
+    (named[key]
+      ? keyText(named[key], t)
+      : key.length === 1
+        ? key.toUpperCase()
+        : key.charAt(0).toUpperCase() + key.slice(1))
+  parts.push(displayKey)
+
+  return parts
+}
+
+export function formatKeybindParts(config: string, t?: (key: KeyLabel) => string): string[] {
+  if (!config || config === "none") return []
+  const keybind = parseKeybind(config)[0]
+  return keybind ? displayKeybindParts(keybind, t) : []
+}
+
+export function formatKeybind(config: string, t?: (key: KeyLabel) => string): string {
+  const parts = formatKeybindParts(config, t)
+  if (parts.length === 0) return ""
  return IS_MAC ? parts.join("") : parts.join("+")
 }

@@ -402,25 +408,26 @@ export const { use: useCommand, provider: CommandProvider } = createSimpleContex
      })
    }

+    const keybindConfig = (id: string) => {
+      if (id === PALETTE_ID) return settings.keybinds.get(PALETTE_ID) ?? DEFAULT_PALETTE_KEYBIND
+      const base = actionId(id)
+      return options().find((x) => actionId(x.id) === base)?.keybind ?? bind(base, catalog[base]?.keybind)
+    }
+
    return {
      register,
      trigger(id: string, source?: CommandSource) {
        run(id, source)
      },
      keybind(id: string) {
-        if (id === PALETTE_ID) {
-          return formatKeybind(settings.keybinds.get(PALETTE_ID) ?? DEFAULT_PALETTE_KEYBIND, language.t)
-        }
-
-        const base = actionId(id)
-        const option = options().find((x) => actionId(x.id) === base)
-        if (option?.keybind) return formatKeybind(option.keybind, language.t)
-
-        const meta = catalog[base]
-        const config = bind(base, meta?.keybind)
+        const config = keybindConfig(id)
        if (!config) return ""
        return formatKeybind(config, language.t)
      },
+      keybindParts(id: string) {
+        const config = keybindConfig(id)
+        return config ? formatKeybindParts(config, language.t) : []
+      },
      show: showPalette,
      keybinds(enabled: boolean) {
        setStore("suspendCount", (count) => Math.max(0, count + (enabled ? -1 : 1)))
@@ -208,7 +208,7 @@ export const { use: useComments, provider: CommentsProvider } = createSimpleCont
        const decoded = decodeSessionKey(key)
        return createRoot((dispose) => ({
          value: createCommentSession(
-            serverSDK.scope,
+            serverSDK().scope,
            decoded.dir,
            decoded.id === WORKSPACE_KEY ? undefined : decoded.id,
          ),
@@ -11,7 +11,7 @@ import {
 import type { Message, Part } from "@opencode-ai/sdk/v2/client"
 import { SESSION_CACHE_LIMIT, dropSessionCaches, pickSessionCacheEvictions } from "./global-sync/session-cache"
 import { diffs as list, message as clean } from "@/utils/diffs"
-import { createServerSdkContext, useServerSDK } from "./server-sdk"
+import { type createServerSdkContext } from "./server-sdk"
 import { type createServerSyncContextInner } from "./server-sync"

 const SKIP_PARTS = new Set(["patch", "step-start", "step-finish"])
@@ -174,7 +174,7 @@ function setOptimisticRemove(setStore: (...args: unknown[]) => void, input: Opti
 export const createDirSyncContext = (
  directory: string,
  serverSync: ReturnType<typeof createServerSyncContextInner>,
-  serverSDK: ReturnType<typeof createServerSdkContext> = useServerSDK(),
+  serverSDK: ReturnType<typeof createServerSdkContext>,
 ) => {
  const client = serverSDK.createClient({ directory, throwOnError: true })

@@ -62,10 +62,10 @@ export const { use: useFile, provider: FileProvider } = createSimpleContext({
    const language = useLanguage()
    const layout = useLayout()

-    const scope = createMemo(() => sdk.directory)
+    const scope = createMemo(() => sdk().directory)
    const path = createPathHelpers(scope)
    const tabs = layout.tabs(() =>
-      SessionStateKey.from(serverSDK.scope, SessionRouteKey.fromRoute(params.dir, params.id)),
+      SessionStateKey.from(serverSDK().scope, SessionRouteKey.fromRoute(params.dir, params.id)),
    )

    const inflight = new Map<string, Promise<void>>()
@@ -78,7 +78,10 @@ export const { use: useFile, provider: FileProvider } = createSimpleContext({
    const tree = createFileTreeStore({
      scope,
      normalizeDir: path.normalizeDir,
-      list: (dir) => sdk.client.file.list({ path: dir }).then((x) => x.data ?? []),
+      list: (dir) =>
+        sdk()
+          .client.file.list({ path: dir })
+          .then((x) => x.data ?? []),
      onError: (message) => {
        showToast({
          variant: "error",
@@ -112,7 +115,7 @@ export const { use: useFile, provider: FileProvider } = createSimpleContext({
      })
    })

-    const viewCache = createFileViewCache(serverSDK.scope)
+    const viewCache = createFileViewCache(serverSDK().scope)
    const view = createMemo(() => viewCache.load(scope(), params.id))

    const ensure = (file: string) => {
@@ -176,8 +179,8 @@ export const { use: useFile, provider: FileProvider } = createSimpleContext({

      setLoading(file)

-      const promise = sdk.client.file
-        .read({ path: file })
+      const promise = sdk()
+        .client.file.read({ path: file })
        .then((x) => {
          if (scope() !== directory) return
          const content = x.data
@@ -200,12 +203,14 @@ export const { use: useFile, provider: FileProvider } = createSimpleContext({
    }

    const search = (query: string, dirs: "true" | "false") =>
-      sdk.client.find.files({ query, dirs }).then(
-        (x) => (x.data ?? []).map(path.normalize),
-        () => [],
-      )
+      sdk()
+        .client.find.files({ query, dirs })
+        .then(
+          (x) => (x.data ?? []).map(path.normalize),
+          () => [],
+        )

-    const stop = sdk.event.listen((e) => {
+    const stop = sdk().event.listen((e) => {
      invalidateFromWatcher(e.details, {
        normalize: path.normalize,
        hasFile: (file) => Boolean(store.file[file]),
@@ -134,6 +134,26 @@ describe("applyGlobalEvent", () => {
 })

 describe("applyDirectoryEvent", () => {
+  test("initializes text delta accumulation from the current part text", () => {
+    const part = { ...textPart("part", "session", "message"), text: "existing" }
+    const [store, setStore] = createStore(baseState({ part: { message: [part] } }))
+
+    applyDirectoryEvent({
+      event: {
+        type: "message.part.delta",
+        properties: { messageID: "message", partID: "part", field: "text", delta: " appended" },
+      },
+      store,
+      setStore,
+      push() {},
+      directory: "/tmp",
+      loadLsp() {},
+    })
+
+    expect(store.part_text_accum_delta.part).toBe("existing appended")
+    expect((store.part.message?.[0] as { text: string }).text).toBe("existing appended")
+  })
+
  test("preserves a Home-specific retained session limit", () => {
    const [store, setStore] = createStore(
      baseState({
@@ -282,7 +282,13 @@ export function applyDirectoryEvent(input: {
      if (!parts) break
      const result = Binary.search(parts, props.partID, (p) => p.id)
      if (!result.found) break
-      input.setStore("part_text_accum_delta", props.partID, (existing) => (existing ?? "") + props.delta)
+      const field = props.field as keyof (typeof parts)[number]
+      const current = parts[result.index]?.[field]
+      input.setStore(
+        "part_text_accum_delta",
+        props.partID,
+        (existing) => (existing ?? (typeof current === "string" ? current : "")) + props.delta,
+      )
      input.setStore(
        "part",
        props.messageID,
@@ -246,7 +246,7 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
      }
    }

-    const target = Persist.serverGlobal(serverSdk.scope, "layout", ["layout.v6"])
+    const target = Persist.serverGlobal(serverSdk().scope, "layout", ["layout.v6"])
    const [store, setStore, _, ready] = persisted(
      { ...target, migrate },
      createStore({
@@ -409,11 +409,11 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
    }

    function enrich(project: { worktree: string; expanded: boolean }) {
-      const [childStore] = serverSync.child(project.worktree, { bootstrap: false })
+      const [childStore] = serverSync().child(project.worktree, { bootstrap: false })
      const projectID = childStore.project
      const metadata = projectID
-        ? serverSync.data.project.find((x) => x.id === projectID)
-        : serverSync.data.project.find((x) => x.worktree === project.worktree)
+        ? serverSync().data.project.find((x) => x.id === projectID)
+        : serverSync().data.project.find((x) => x.worktree === project.worktree)

      // Preserve local icon override from per-workspace localStorage cache (childStore.icon).
      // Without this, different subdirectories of the same git repo would share the same
@@ -427,7 +427,7 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(

    const roots = createMemo(() => {
      const map = new Map<string, string>()
-      for (const project of serverSync.data.project) {
+      for (const project of serverSync().data.project) {
        const sandboxes = project.sandboxes ?? []
        for (const sandbox of sandboxes) {
          map.set(sandbox, project.worktree)
@@ -493,12 +493,12 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
    createEffect(() => {
      const projects = enriched()
      if (projects.length === 0) return
-      if (!serverSync.ready) return
+      if (!serverSync().ready) return

      for (const project of projects) {
        if (!project.id) continue
        if (project.id === "global") continue
-        serverSync.project.icon(project.worktree, project.icon?.override)
+        serverSync().project.icon(project.worktree, project.icon?.override)
      }
    })

@@ -532,12 +532,12 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
        colorRequested.set(worktree, color)

        if (project.id === "global") {
-          serverSync.project.meta(worktree, { icon: { color } })
+          serverSync().project.meta(worktree, { icon: { color } })
          continue
        }

-        void serverSdk.client.project
-          .update({ projectID: project.id, directory: worktree, icon: { color } })
+        void serverSdk()
+          .client.project.update({ projectID: project.id, directory: worktree, icon: { color } })
          .catch(() => {
            if (colorRequested.get(worktree) === color) colorRequested.delete(worktree)
          })
@@ -554,7 +554,7 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
          sessionTimer = undefined
          void Promise.all(
            server.projects.list().map((project) => {
-              return serverSync.project.loadSessions(project.worktree)
+              return serverSync().project.loadSessions(project.worktree)
            }),
          )
        }, 0)
@@ -584,7 +584,7 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
        open(directory: string) {
          const root = rootFor(directory)
          if (server.projects.list().find((x) => x.worktree === root)) return
-          void serverSync.project.loadSessions(root)
+          void serverSync().project.loadSessions(root)
          server.projects.open(root)
        },
        close(directory: string) {
@@ -64,12 +64,12 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
    const models = useModels()

    const id = createMemo(() => params.id || undefined)
-    const list = createMemo(() => sync.data.agent.filter((item) => item.mode !== "subagent" && !item.hidden))
+    const list = createMemo(() => sync().data.agent.filter((item) => item.mode !== "subagent" && !item.hidden))
    const connected = createMemo(() => new Set(providers.connected().map((item) => item.id)))

    const [saved, setSaved] = persisted(
      {
-        ...Persist.serverWorkspace(serverSDK.scope, sdk.directory, "model-selection", ["model-selection.v1"]),
+        ...Persist.serverWorkspace(serverSDK().scope, sdk().directory, "model-selection", ["model-selection.v1"]),
        migrate,
      },
      createStore<Saved>({
@@ -124,14 +124,14 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
    const scope = createMemo<State | undefined>(() => {
      const session = id()
      if (!session) return store.draft
-      return saved.session[session] ?? handoff.get(handoffKey(serverSDK.scope, sdk.directory, session))
+      return saved.session[session] ?? handoff.get(handoffKey(serverSDK().scope, sdk().directory, session))
    })

    createEffect(() => {
      const session = id()
      if (!session) return

-      const key = handoffKey(serverSDK.scope, sdk.directory, session)
+      const key = handoffKey(serverSDK().scope, sdk().directory, session)
      const next = handoff.get(key)
      if (!next) return
      if (saved.session[session] !== undefined) {
@@ -144,8 +144,9 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
    })

    const configuredModel = () => {
-      if (!sync.data.config.model) return
-      const [providerID, modelID] = sync.data.config.model.split("/")
+      const configured = sync().data.config.model
+      if (!configured) return
+      const [providerID, modelID] = configured.split("/")
      const model = { providerID, modelID }
      if (validModel(model)) return model
    }
@@ -363,7 +364,7 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
    }

    const result = {
-      slug: createMemo(() => base64Encode(sdk.directory)),
+      slug: createMemo(() => base64Encode(sdk().directory)),
      model,
      agent,
      session: {
@@ -374,13 +375,13 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
          const next = clone(snapshot())
          if (!next) return

-          if (dir === sdk.directory) {
+          if (dir === sdk().directory) {
            setSaved("session", session, next)
            setStore("draft", undefined)
            return
          }

-          handoff.set(handoffKey(serverSDK.scope, dir, session), next)
+          handoff.set(handoffKey(serverSDK().scope, dir, session), next)
          setStore("draft", undefined)
        },
        restore(msg: { sessionID: string; agent: string; model: ModelKey }) {
@@ -388,7 +389,7 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
          if (!session) return
          if (msg.sessionID !== session) return
          if (saved.session[session] !== undefined) return
-          if (handoff.has(handoffKey(serverSDK.scope, sdk.directory, session))) return
+          if (handoff.has(handoffKey(serverSDK().scope, sdk().directory, session))) return

          setSaved("session", session, {
            agent: msg.agent,
@@ -8,7 +8,7 @@ export function useMcpToggle() {
  const language = useLanguage()

  return useMutation(() => ({
-    mutationFn: sync.mcp.toggle,
+    mutationFn: sync().mcp.toggle,
    onError: (error) =>
      showToast({
        variant: "error",
@@ -125,7 +125,7 @@ export const { use: useNotification, provider: NotificationProvider } = createSi
    const currentSession = createMemo(() => params.id)

    const [store, setStore, _, ready] = persisted(
-      Persist.serverGlobal(serverSDK.scope, "notification", ["notification.v1"]),
+      Persist.serverGlobal(serverSDK().scope, "notification", ["notification.v1"]),
      createStore({
        list: [] as Notification[],
      }),
@@ -208,11 +208,11 @@ export const { use: useNotification, provider: NotificationProvider } = createSi

    const lookup = async (directory: string, sessionID?: string) => {
      if (!sessionID) return undefined
-      const [syncStore] = serverSync.child(directory, { bootstrap: false })
+      const [syncStore] = serverSync().child(directory, { bootstrap: false })
      const match = Binary.search(syncStore.session, sessionID, (s) => s.id)
      if (match.found) return syncStore.session[match.index]
-      return serverSDK.client.session
-        .get({ directory, sessionID })
+      return serverSDK()
+        .client.session.get({ directory, sessionID })
        .then((x) => x.data)
        .catch(() => undefined)
    }
@@ -286,7 +286,7 @@ export const { use: useNotification, provider: NotificationProvider } = createSi
      })
    }

-    const unsub = serverSDK.event.listen((e) => {
+    const unsub = serverSDK().event.listen((e) => {
      const event = e.details
      if (event.type !== "session.idle" && event.type !== "session.error") return

@@ -55,13 +55,13 @@ export const { use: usePermission, provider: PermissionProvider } = createSimple
    const permissionsEnabled = createMemo(() => {
      const directory = decode64(params.dir)
      if (!directory) return false
-      const [store] = serverSync.child(directory)
+      const [store] = serverSync().child(directory)
      return hasPermissionPromptRules(store.config.permission)
    })

    const [store, setStore, _, ready] = persisted(
      {
-        ...Persist.serverGlobal(serverSDK.scope, "permission", ["permission.v3"]),
+        ...Persist.serverGlobal(serverSDK().scope, "permission", ["permission.v3"]),
        migrate(value) {
          if (!value || typeof value !== "object" || Array.isArray(value)) return value

@@ -87,7 +87,7 @@ export const { use: usePermission, provider: PermissionProvider } = createSimple
      if (!ready()) return
      const directory = decode64(params.dir)
      if (!directory) return
-      const [childStore] = serverSync.child(directory)
+      const [childStore] = serverSync().child(directory)
      const perm = childStore.config.permission
      if (typeof perm === "string" && perm === "allow") {
        const key = directoryAcceptKey(directory)
@@ -119,9 +119,11 @@ export const { use: usePermission, provider: PermissionProvider } = createSimple
    }

    const respond: PermissionRespondFn = (input) => {
-      serverSDK.client.permission.respond(input).catch(() => {
-        responded.delete(input.permissionID)
-      })
+      serverSDK()
+        .client.permission.respond(input)
+        .catch(() => {
+          responded.delete(input.permissionID)
+        })
    }

    function respondOnce(permission: PermissionRequest, directory?: string) {
@@ -140,7 +142,7 @@ export const { use: usePermission, provider: PermissionProvider } = createSimple
    }

    function isAutoAccepting(sessionID: string, directory?: string) {
-      const session = directory ? serverSync.child(directory, { bootstrap: false })[0].session : []
+      const session = directory ? serverSync().child(directory, { bootstrap: false })[0].session : []
      return autoRespondsPermission(store.autoAccept, session, { sessionID }, directory)
    }

@@ -149,7 +151,7 @@ export const { use: usePermission, provider: PermissionProvider } = createSimple
    }

    function shouldAutoRespond(permission: PermissionRequest, directory?: string) {
-      const session = directory ? serverSync.child(directory, { bootstrap: false })[0].session : []
+      const session = directory ? serverSync().child(directory, { bootstrap: false })[0].session : []
      return autoRespondsPermission(store.autoAccept, session, permission, directory)
    }

@@ -160,7 +162,7 @@ export const { use: usePermission, provider: PermissionProvider } = createSimple
      return next
    }

-    const unsubscribe = serverSDK.event.listen((e) => {
+    const unsubscribe = serverSDK().event.listen((e) => {
      const event = e.details
      if (event?.type !== "permission.asked") return

@@ -179,8 +181,8 @@ export const { use: usePermission, provider: PermissionProvider } = createSimple
        }),
      )

-      serverSDK.client.permission
-        .list({ directory })
+      serverSDK()
+        .client.permission.list({ directory })
        .then((x) => {
          if (!isAutoAcceptingDirectory(directory)) return
          for (const perm of x.data ?? []) {
@@ -211,8 +213,8 @@ export const { use: usePermission, provider: PermissionProvider } = createSimple
        }),
      )

-      serverSDK.client.permission
-        .list({ directory })
+      serverSDK()
+        .client.permission.list({ directory })
        .then((x) => {
          if (enableVersion.get(key) !== version) return
          if (!isAutoAccepting(sessionID, directory)) return
@@ -269,7 +271,7 @@ export const { use: usePermission, provider: PermissionProvider } = createSimple
      },
      permissionsEnabled,
      isPermissionAllowAll(directory: string) {
-        const [childStore] = serverSync.child(directory)
+        const [childStore] = serverSync().child(directory)
        const perm = childStore.config.permission
        return typeof perm === "string" && perm === "allow"
      },
@@ -55,6 +55,9 @@ type PlatformBase = {
    onFile: (file: File) => Promise<unknown>,
  ): Promise<void>

+  /** Resolve the native source path for a desktop File. */
+  getPathForFile?(file: File): string
+
  /** Open a native save file picker dialog (desktop only) */
  saveFilePickerDialog?(opts?: SaveFilePickerOptions): Promise<string | null>

@@ -33,6 +33,7 @@ export interface ImageAttachmentPart {
  type: "image"
  id: string
  filename: string
+  sourcePath?: string
  mime: string
  dataUrl: string
 }
@@ -153,6 +154,14 @@ const MAX_PROMPT_SESSIONS = 20

 type PromptSession = ReturnType<typeof createPromptSession>

+type PromptStore = {
+  prompt: Prompt
+  cursor?: number
+  context: {
+    items: (ContextItem & { key: string })[]
+  }
+}
+
 type Scope = { draftID: string } | { dir: string; id?: string }

 function scopeKey(scope: Scope) {
@@ -174,25 +183,26 @@ function promptTarget(serverScope: ServerScope, scope: Scope) {
 function createPromptSession(serverScope: ServerScope, scope: Scope) {
  const [store, setStore, _, ready] = persisted(
    promptTarget(serverScope, scope),
-    createStore<{
-      prompt: Prompt
-      cursor?: number
-      context: {
-        items: (ContextItem & { key: string })[]
-      }
-    }>({
-      prompt: clonePrompt(DEFAULT_PROMPT),
-      cursor: undefined,
-      context: {
-        items: [],
-      },
-    }),
+    createStore<PromptStore>(promptStore()),
  )

+  return { ready, ...createPromptStateValue(store, setStore) }
+}
+
+function promptStore(): PromptStore {
+  return {
+    prompt: clonePrompt(DEFAULT_PROMPT),
+    cursor: undefined,
+    context: {
+      items: [],
+    },
+  }
+}
+
+function createPromptStateValue(store: PromptStore, setStore: SetStoreFunction<PromptStore>) {
  const actions = createPromptActions(setStore)

  return {
-    ready,
    current: () => store.prompt,
    cursor: createMemo(() => store.cursor),
    dirty: () => !isPromptEqual(store.prompt, DEFAULT_PROMPT),
@@ -232,6 +242,15 @@ function createPromptSession(serverScope: ServerScope, scope: Scope) {
  }
 }

+export function createPromptState() {
+  const [store, setStore] = createStore<PromptStore>(promptStore())
+  const ready = Object.assign(() => true, { promise: Promise.resolve(true) })
+  return {
+    ready: () => ready,
+    ...createPromptStateValue(store, setStore),
+  }
+}
+
 export const { use: usePrompt, provider: PromptProvider } = createSimpleContext({
  name: "Prompt",
  gate: false,
@@ -272,7 +291,7 @@ export const { use: usePrompt, provider: PromptProvider } = createSimpleContext(

      const entry = createRoot(
        (dispose) => ({
-          value: createPromptSession(serverSDK.scope, scope),
+          value: createPromptSession(serverSDK().scope, scope),
          dispose,
        }),
        owner,
@@ -1,11 +1,17 @@
 import { createSimpleContext } from "@opencode-ai/ui/context"
-import { useServerSDK } from "./server-sdk"
+import { type Accessor, createMemo } from "solid-js"
+import { type ServerSDK, useServerSDK } from "./server-sdk"
+
+export type DirectorySDK = ReturnType<ServerSDK["createDirSdkContext"]>

 export const { use: useSDK, provider: SDKProvider } = createSimpleContext({
  name: "SDK",
-  init: (props: { directory: string }) => {
+  // Resolves the directory-scoped SDK reactively from the (possibly changing) server.
+  init: (props: { directory: string | Accessor<string> }) => {
    const serverSDK = useServerSDK()
-
-    return serverSDK.createDirSdkContext(props.directory)
+    return createMemo(() => {
+      const directory = typeof props.directory === "function" ? props.directory() : props.directory
+      return serverSDK().createDirSdkContext(directory)
+    })
  },
 })
@@ -1,5 +1,6 @@
 import { describe, expect, test } from "bun:test"
-import { resumeStreamAfterPageShow } from "./server-sdk"
+import { coalesceServerEvents, resumeStreamAfterPageShow } from "./server-sdk"
+import type { Event } from "@opencode-ai/sdk/v2/client"

 describe("resumeStreamAfterPageShow", () => {
  test("restarts a stream only after a back-forward cache restore", () => {
@@ -12,3 +13,41 @@ describe("resumeStreamAfterPageShow", () => {
    expect(starts).toBe(1)
  })
 })
+
+describe("coalesceServerEvents", () => {
+  const delta = (value: string, field = "text") => ({
+    directory: "/repo",
+    payload: {
+      type: "message.part.delta",
+      properties: { messageID: "msg", partID: "part", field, delta: value },
+    } as Event,
+  })
+
+  test("merges adjacent deltas for the same field", () => {
+    const result = coalesceServerEvents([delta("hello "), delta("world")])
+
+    expect(result).toHaveLength(1)
+    expect(result[0]?.payload).toMatchObject({ properties: { delta: "hello world" } })
+  })
+
+  test("preserves event boundaries and distinct fields", () => {
+    const status = {
+      directory: "/repo",
+      payload: { type: "session.status", properties: { sessionID: "ses", status: { type: "idle" } } } as Event,
+    }
+    const result = coalesceServerEvents([delta("a"), delta("b", "metadata"), status, delta("c")])
+
+    expect(result.map((event) => event.payload.type)).toEqual([
+      "message.part.delta",
+      "message.part.delta",
+      "session.status",
+      "message.part.delta",
+    ])
+  })
+
+  test("drops stale deltas", () => {
+    const result = coalesceServerEvents([delta("stale")], new Set(["/repo:msg:part"]))
+
+    expect(result).toEqual([])
+  })
+})
@@ -2,7 +2,7 @@ import type { Event } from "@opencode-ai/sdk/v2/client"
 import { createSimpleContext } from "@opencode-ai/ui/context"
 import { createGlobalEmitter } from "@solid-primitives/event-bus"
 import { makeEventListener } from "@solid-primitives/event-listener"
-import { batch, onCleanup, onMount } from "solid-js"
+import { type Accessor, batch, createMemo, onCleanup, onMount } from "solid-js"
 import { createSdkForServer } from "@/utils/server"
 import { useLanguage } from "./language"
 import { usePlatform } from "./platform"
@@ -15,13 +15,46 @@ const isAbortError = (error: unknown) =>
  error !== null && typeof error === "object" && "name" in error && error.name === "AbortError"

 const isStreamClosed = (error: unknown, signal?: AbortSignal) => isAbortError(error) || signal?.aborted === true
+type QueuedServerEvent = { directory: string; payload: Event }
+
+const deltaKey = (directory: string, messageID: string, partID: string) => `${directory}:${messageID}:${partID}`
+
+export function coalesceServerEvents(events: QueuedServerEvent[], stale?: Set<string>) {
+  const output: QueuedServerEvent[] = []
+  const deltas = new Map<string, number>()
+  events.forEach((event) => {
+    if (stale && event.payload.type === "message.part.delta") {
+      const props = event.payload.properties
+      if (stale.has(deltaKey(event.directory, props.messageID, props.partID))) return
+    }
+    if (event.payload.type !== "message.part.delta") {
+      deltas.clear()
+      output.push(event)
+      return
+    }
+    const props = event.payload.properties
+    const id = `${deltaKey(event.directory, props.messageID, props.partID)}:${props.field}`
+    const index = deltas.get(id)
+    const existing = index === undefined ? undefined : output[index]
+    if (!existing || existing.payload.type !== "message.part.delta") {
+      deltas.set(id, output.length)
+      output.push({
+        directory: event.directory,
+        payload: { ...event.payload, properties: { ...props } },
+      })
+      return
+    }
+    existing.payload.properties.delta += props.delta
+  })
+  return output
+}

 export function resumeStreamAfterPageShow(event: PageTransitionEvent, start: () => unknown) {
  if (!event.persisted) return
  start()
 }

-export function createServerSdkContext(server: ServerConnection.Any, scope: ServerScope) {
+function createServerSdkContextBase(server: ServerConnection.Any, scope: ServerScope) {
  const platform = usePlatform()
  const abort = new AbortController()

@@ -45,7 +78,7 @@ export function createServerSdkContext(server: ServerConnection.Any, scope: Serv
    [key: string]: Event
  }>()

-  type Queued = { directory: string; payload: Event }
+  type Queued = QueuedServerEvent
  const FLUSH_FRAME_MS = 16
  const STREAM_YIELD_MS = 8
  const RECONNECT_DELAY_MS = 250
@@ -57,8 +90,6 @@ export function createServerSdkContext(server: ServerConnection.Any, scope: Serv
  let timer: ReturnType<typeof setTimeout> | undefined
  let last = 0

-  const deltaKey = (directory: string, messageID: string, partID: string) => `${directory}:${messageID}:${partID}`
-
  const key = (directory: string, payload: Event) => {
    if (payload.type === "session.status") return `session.status:${directory}:${payload.properties.sessionID}`
    if (payload.type === "lsp.updated") return `lsp.updated:${directory}`
@@ -83,14 +114,9 @@ export function createServerSdkContext(server: ServerConnection.Any, scope: Serv
    staleDeltas.clear()

    last = Date.now()
+    const output = coalesceServerEvents(events, skip)
    batch(() => {
-      for (const event of events) {
-        if (skip && event.payload.type === "message.part.delta") {
-          const props = event.payload.properties
-          if (skip.has(deltaKey(event.directory, props.messageID, props.partID))) continue
-        }
-        emitter.emit(event.directory, event.payload)
-      }
+      output.forEach((event) => emitter.emit(event.directory, event.payload))
    })

    buffer.length = 0
@@ -261,21 +287,31 @@ export function createServerSdkContext(server: ServerConnection.Any, scope: Serv
  }
 }

-export type ServerSDK = ReturnType<typeof createServerSdkContext>
+type ServerSDKBase = ReturnType<typeof createServerSdkContextBase>
+export type ServerSDK = ServerSDKBase & {
+  createDirSdkContext: (directory: string) => ReturnType<typeof createDirSdkContext>
+}
+
+export function createServerSdkContext(server: ServerConnection.Any, scope: ServerScope): ServerSDK {
+  const sdk = createServerSdkContextBase(server, scope)
+  return Object.assign(sdk, {
+    createDirSdkContext: createRefCountMap((dir) => createDirSdkContext(dir, sdk)),
+  })
+}

 export const { use: useServerSDK, provider: ServerSDKProvider } = createSimpleContext({
  name: "ServerSDK",
-  init: (props: { server?: ServerConnection.Any }) => {
+  // Returns an accessor so the resolved server can change reactively (e.g. a
+  // /new-session draft retargeting its server) without re-instantiating the subtree.
+  init: (props: { server?: Accessor<ServerConnection.Any | undefined> }) => {
    const global = useGlobal()
    const language = useLanguage()
    const server = useServer()

-    const conn = props.server ?? server.current
-    if (!conn) throw new Error(language.t("error.serverSDK.noServerAvailable"))
-
-    const ctx = global.createServerCtx(conn)
-    return Object.assign(ctx.sdk, {
-      createDirSdkContext: createRefCountMap((dir) => createDirSdkContext(dir, ctx.sdk)),
+    return createMemo<ServerSDK>(() => {
+      const conn = props.server?.() ?? server.current
+      if (!conn) throw new Error(language.t("error.serverSDK.noServerAvailable"))
+      return global.createServerCtx(conn).sdk
    })
  },
 })
@@ -284,7 +320,7 @@ type SDKEventMap = {
  [key in Event["type"]]: Extract<Event, { type: key }>
 }

-function createDirSdkContext(directory: string, serverSDK: ServerSDK) {
+function createDirSdkContext(directory: string, serverSDK: ServerSDKBase) {
  const client = serverSDK.createClient({
    directory,
    throwOnError: true,
@@ -1,11 +1,11 @@
 import type { Config, OpencodeClient, Path, Project, ProviderAuthResponse, Todo } from "@opencode-ai/sdk/v2/client"
 import { showToast } from "@/utils/toast"
 import { getFilename } from "@opencode-ai/core/util/path"
-import { batch, getOwner, onCleanup, onMount, untrack } from "solid-js"
+import { type Accessor, batch, createMemo, getOwner, onCleanup, onMount, untrack } from "solid-js"
 import { createStore, produce, reconcile } from "solid-js/store"
 import { useLanguage } from "@/context/language"
 import type { InitError } from "../pages/error"
-import { ServerSDK, useServerSDK } from "./server-sdk"
+import { ServerSDK } from "./server-sdk"
 import {
  bootstrapDirectory,
  bootstrapGlobal,
@@ -84,8 +84,7 @@ function makeQueryOptionsApi(
 }
 export type QueryOptionsApi = ReturnType<typeof makeQueryOptionsApi>

-export function createServerSyncContextInner(_serverSDK?: ServerSDK) {
-  const serverSDK: ServerSDK = _serverSDK ?? useServerSDK()
+export function createServerSyncContextInner(serverSDK: ServerSDK) {
  const language = useLanguage()
  const owner = getOwner()
  if (!owner) throw new Error("ServerSync must be created within owner")
@@ -507,33 +506,37 @@ export function createServerSyncContextInner(_serverSDK?: ServerSDK) {
  }
 }

-export function createServerSyncContext(_serverSDK?: ServerSDK) {
-  const inner = createServerSyncContextInner(_serverSDK)
+export function createServerSyncContext(serverSDK: ServerSDK) {
+  const inner = createServerSyncContextInner(serverSDK)
  return Object.assign(inner, {
    createDirSyncContext: createRefCountMap(
-      (dir) => createDirSyncContext(dir, inner, _serverSDK),
+      (dir) => createDirSyncContext(dir, inner, serverSDK),
      (dir) => inner.disableMcp(dir),
      directoryKey,
    ),
  })
 }

+export type ServerSync = ReturnType<typeof createServerSyncContext>
+
 export const { use: useServerSync, provider: ServerSyncProvider } = createSimpleContext({
  name: "ServerSync",
-  gate: false,
-  init: (props: { server?: ServerConnection.Any }) => {
+  // Returns an accessor so the resolved server can change reactively without
+  // re-instantiating the subtree (mirrors useServerSDK).
+  init: (props: { server?: Accessor<ServerConnection.Any | undefined> }) => {
    const global = useGlobal()
    const language = useLanguage()
    const server = useServer()

-    const conn = props.server ?? server.current
-    if (!conn) throw new Error(language.t("error.serverSDK.noServerAvailable"))
-    const ctx = global.createServerCtx(conn)
-
-    return ctx.sync
+    return createMemo<ServerSync>(() => {
+      const conn = props.server?.() ?? server.current
+      if (!conn) throw new Error(language.t("error.serverSDK.noServerAvailable"))
+      return global.createServerCtx(conn).sync
+    })
  },
 })

 export function useQueryOptions() {
-  return useServerSync().queryOptions
+  const sync = useServerSync()
+  return createMemo(() => sync().queryOptions)
 }
@@ -153,6 +153,15 @@ export const { use: useSettings, provider: SettingsProvider } = createSimpleCont
  gate: false,
  init: () => {
    const [store, setStore, _, ready] = persisted("settings.v3", createStore<Settings>(defaultSettings))
+    const showFileTree = withFallback(() => store.general?.showFileTree, defaultSettings.general.showFileTree)
+    const showSearch = withFallback(() => store.general?.showSearch, defaultSettings.general.showSearch)
+    const showStatus = withFallback(() => store.general?.showStatus, defaultSettings.general.showStatus)
+    const showCustomAgents = withFallback(
+      () => store.general?.showCustomAgents,
+      defaultSettings.general.showCustomAgents,
+    )
+    const newLayoutDesigns = withFallback(() => store.general?.newLayoutDesigns, newLayoutDesignsDefault)
+    const visible = (preference: () => boolean) => createMemo(() => !newLayoutDesigns() || preference())

    createEffect(() => {
      if (typeof document === "undefined") return
@@ -187,7 +196,7 @@ export const { use: useSettings, provider: SettingsProvider } = createSimpleCont
        setFollowup(value: "queue" | "steer") {
          setStore("general", "followup", value === "queue" ? "steer" : value)
        },
-        showFileTree: withFallback(() => store.general?.showFileTree, defaultSettings.general.showFileTree),
+        showFileTree,
        setShowFileTree(value: boolean) {
          setStore("general", "showFileTree", value)
        },
@@ -195,11 +204,11 @@ export const { use: useSettings, provider: SettingsProvider } = createSimpleCont
        setShowNavigation(value: boolean) {
          setStore("general", "showNavigation", value)
        },
-        showSearch: withFallback(() => store.general?.showSearch, defaultSettings.general.showSearch),
+        showSearch,
        setShowSearch(value: boolean) {
          setStore("general", "showSearch", value)
        },
-        showStatus: withFallback(() => store.general?.showStatus, defaultSettings.general.showStatus),
+        showStatus,
        setShowStatus(value: boolean) {
          setStore("general", "showStatus", value)
        },
@@ -235,15 +244,21 @@ export const { use: useSettings, provider: SettingsProvider } = createSimpleCont
        setShowSessionProgressBar(value: boolean) {
          setStore("general", "showSessionProgressBar", value)
        },
-        showCustomAgents: withFallback(() => store.general?.showCustomAgents, defaultSettings.general.showCustomAgents),
+        showCustomAgents,
        setShowCustomAgents(value: boolean) {
          setStore("general", "showCustomAgents", value)
        },
-        newLayoutDesigns: withFallback(() => store.general?.newLayoutDesigns, newLayoutDesignsDefault),
+        newLayoutDesigns,
        setNewLayoutDesigns(value: boolean) {
          setStore("general", "newLayoutDesigns", value)
        },
      },
+      visibility: {
+        fileTree: visible(showFileTree),
+        search: visible(showSearch),
+        status: visible(showStatus),
+        customAgents: visible(showCustomAgents),
+      },
      appearance: {
        fontSize: withFallback(() => store.appearance?.fontSize, defaultSettings.appearance.fontSize),
        setFontSize(value: number) {
@@ -1,4 +1,5 @@
 import { Binary } from "@opencode-ai/core/util/binary"
+import { createMemo } from "solid-js"
 import { useServerSync } from "./server-sync"
 import { useSDK } from "./sdk"
 import type { Message, Part } from "@opencode-ai/sdk/v2/client"
@@ -112,5 +113,7 @@ export const useSync = () => {
  const serverSync = useServerSync()
  const sdk = useSDK()

-  return serverSync.createDirSyncContext(sdk.directory)
+  return createMemo(() => serverSync().createDirSyncContext(sdk().directory))
 }
+
+export type DirectorySync = ReturnType<ReturnType<typeof useSync>>
@@ -27,6 +27,10 @@ export type DraftTab = {

 export type Tab = SessionTab | DraftTab

+type RecentTab = {
+  key?: string
+}
+
 export const draftHref = (draftID: string) => `/new-session?draftId=${encodeURIComponent(draftID)}`

 export const tabHref = (tab: Tab) =>
@@ -62,26 +66,45 @@ export const { use: useTabs, provider: TabsProvider } = createSimpleContext({
      },
      createStore<Tab[]>([]),
    )
+    const [recent, setRecent, , recentReady] = persisted(Persist.global("tabs.recent"), createStore<RecentTab>({}))

    const params = useParams()
    const navigate = useNavigate()
    const location = useLocation()

    const closing = new Set<string>()
+    let recentWrite = 0
+    let recentValue: string | undefined
+
+    const recentKey = () => (recentWrite ? recentValue : recent.key)
+
+    const setRecentKey = (key: string | undefined) => {
+      const write = ++recentWrite
+      recentValue = key
+      if (recentReady()) {
+        setRecent("key", key)
+        return
+      }
+      void recentReady.promise?.then(() => {
+        if (write === recentWrite) setRecent("key", key)
+      })
+    }

    const removeDraftPersisted = (draftID: string) => {
      for (const key of draftPersistedKeys()) removePersisted(Persist.draft(draftID, key), platform)
    }

    createEffect(() => {
-      if (!ready()) return
+      if (!ready() || !recentReady()) return
      const servers = new Set(server.list.map(ServerConnection.key))
-      if (store.every((tab) => servers.has(tab.server))) return
-      setStore((tabs) => tabs.filter((tab) => servers.has(tab.server)))
+      const next = store.filter((tab) => servers.has(tab.server))
+      if (next.length !== store.length) setStore(() => next)
+      if (recent.key && !next.some((tab) => tabKey(tab) === recent.key)) setRecentKey(undefined)
    })

    const navigateTab = (tab: Tab) => {
      const href = tabHref(tab)
+      setRecentKey(tabKey(tab))
      if (tab.server === server.key) {
        navigate(href)
        return
@@ -129,14 +152,16 @@ export const { use: useTabs, provider: TabsProvider } = createSimpleContext({
        // and fall back home. Navigate to the new session first so we leave /new-session
        // before the draft is removed from the store.
        const active = location.pathname === "/new-session" && location.query.draftId === draftID
+        const next = { type: "session" as const, ...session }
        startTransition(() => {
          setStore(
            produce((tabs) => {
              const index = tabs.findIndex((tab) => tab.type === "draft" && tab.draftID === draftID)
-              if (index !== -1) tabs[index] = { type: "session", ...session }
+              if (index !== -1) tabs[index] = next
            }),
          )
-          if (active) navigateTab({ type: "session", ...session })
+          if (recent.key === `draft:${draftID}`) setRecentKey(tabKey(next))
+          if (active) navigateTab(next)
        })
        removeDraftPersisted(draftID)
      },
@@ -153,6 +178,7 @@ export const { use: useTabs, provider: TabsProvider } = createSimpleContext({
              tabs.splice(index, 1)
            }),
          )
+          if (recent.key === key) setRecentKey(nextTab && tabKey(nextTab))
          if (nextTab) navigateTab(nextTab)
          else navigate("/")
        }).finally(() => closing.delete(key))
@@ -160,11 +186,22 @@ export const { use: useTabs, provider: TabsProvider } = createSimpleContext({
      },
      removeServer(key: ServerConnection.Key) {
        const drafts = store.flatMap((tab) => (tab.type === "draft" && tab.server === key ? [tab.draftID] : []))
+        const removed = store.filter((tab) => tab.server === key).map(tabKey)
        setStore((tabs) => tabs.filter((tab) => tab.server !== key))
+        if (recent.key && removed.includes(recent.key)) setRecentKey(undefined)
        for (const draftID of drafts) removeDraftPersisted(draftID)
        if (server.key === key) navigate("/")
      },
      removeSessions: (input: SessionTabsRemovedDetail) => {
+        const removed = store
+          .filter(
+            (tab) =>
+              tab.type === "session" &&
+              tab.server === server.key &&
+              atob(tab.dirBase64) === input.directory &&
+              input.sessionIDs.includes(tab.sessionId),
+          )
+          .map(tabKey)
        void startTransition(() => {
          setStore(
            produce((tabs) => {
@@ -207,10 +244,29 @@ export const { use: useTabs, provider: TabsProvider } = createSimpleContext({
              else navigate("/")
            }),
          )
+          if (recent.key && removed.includes(recent.key)) setRecentKey(undefined)
        })
      },
+      select: navigateTab,
+      remember(tab: Tab) {
+        const key = tabKey(tab)
+        if (recentKey() !== key) setRecentKey(key)
+      },
+      toggleHome(input: { home: boolean; current?: Tab }) {
+        if (input.home) {
+          const tab = store.find((tab) => tabKey(tab) === recentKey())
+          if (tab) navigateTab(tab)
+          return
+        }
+        if (input.current) {
+          setRecentKey(tabKey(input.current))
+          navigate("/")
+          return
+        }
+        navigate("/")
+      },
    }

-    return { ...actions, store, ready }
+    return { ...actions, store, ready, recentReady }
  },
 })
@@ -2,7 +2,7 @@ import { createStore, produce } from "solid-js/store"
 import { createSimpleContext } from "@opencode-ai/ui/context"
 import { batch, createEffect, createMemo, createRoot, on, onCleanup } from "solid-js"
 import { useParams } from "@solidjs/router"
-import { useSDK } from "./sdk"
+import { useSDK, type DirectorySDK } from "./sdk"
 import type { Platform } from "./platform"
 import { useServer } from "./server"
 import { defaultTitle, titleNumber } from "./terminal-title"
@@ -143,7 +143,7 @@ export function clearWorkspaceTerminals(
 }

 function createWorkspaceTerminalSession(
-  sdk: ReturnType<typeof useSDK>,
+  sdk: DirectorySDK,
  dir: string,
  scope: ServerScopeValue,
  legacySessionID?: string,
@@ -202,7 +202,7 @@ function createWorkspaceTerminalSession(
  })
  onCleanup(unsub)

-  const update = (client: ReturnType<typeof useSDK>["client"], pty: Partial<LocalPTY> & { id: string }) => {
+  const update = (client: DirectorySDK["client"], pty: Partial<LocalPTY> & { id: string }) => {
    const index = store.all.findIndex((x) => x.id === pty.id)
    const previous = index >= 0 ? store.all[index] : undefined
    if (index >= 0) {
@@ -223,7 +223,7 @@ function createWorkspaceTerminalSession(
      })
  }

-  const clone = async (client: ReturnType<typeof useSDK>["client"], id: string) => {
+  const clone = async (client: DirectorySDK["client"], id: string) => {
    const index = store.all.findIndex((x) => x.id === id)
    const pty = store.all[index]
    if (!pty) return
@@ -412,7 +412,7 @@ export const { use: useTerminal, provider: TerminalProvider } = createSimpleCont
      }

      const entry = createRoot((dispose) => ({
-        value: createWorkspaceTerminalSession(sdk, dir, serverScope, legacySessionID),
+        value: createWorkspaceTerminalSession(sdk(), dir, serverScope, legacySessionID),
        dispose,
      }))

@@ -141,7 +141,7 @@ export const DESKTOP_MENU: DesktopMenu[] = [
    id: "view",
    label: "View",
    items: [
-      { type: "item", label: "Toggle Sidebar", command: "sidebar.toggle", accelerator: { macos: "Cmd+B" } },
+      { type: "item", label: "Toggle Sidebar", command: "sidebar.toggle" },
      { type: "item", label: "Toggle Terminal", command: "terminal.toggle", accelerator: { macos: "Ctrl+`" } },
      { type: "item", label: "Toggle File Tree", command: "fileTree.toggle" },
      { type: "separator" },
@@ -22,10 +22,10 @@ export function useProviders() {
  const dir = createMemo(() => decode64(params.dir) ?? "")
  const providers = () => {
    if (dir()) {
-      const [projectStore] = serverSync.child(dir())
+      const [projectStore] = serverSync().child(dir())
      if (projectStore.provider_ready) return projectStore.provider
    }
-    return serverSync.data.provider
+    return serverSync().data.provider
  }
  return {
    all: () => providers().all,
@@ -281,6 +281,11 @@ export const dict = {
  "dialog.fork.empty": "لا توجد رسائل للتفرع منها",
  "dialog.directory.search.placeholder": "البحث في المجلدات",
  "dialog.directory.empty": "لم يتم العثور على مجلدات",
+  "dialog.directory.action.selectFile": "اختيار ملف",
+  "dialog.directory.action.selectFolder": "اختيار مجلد",
+  "dialog.directory.root": "الجذر",
+  "dialog.directory.parent": "المجلد الأصل",
+  "dialog.directory.readError": "تعذرت قراءة هذا المجلد",
  "dialog.server.title": "الخوادم",
  "dialog.server.description": "تبديل خادم OpenCode الذي يتصل به هذا التطبيق.",
  "dialog.server.search.placeholder": "البحث في الخوادم",
@@ -281,6 +281,11 @@ export const dict = {
  "dialog.fork.empty": "Nenhuma mensagem para bifurcar",
  "dialog.directory.search.placeholder": "Buscar pastas",
  "dialog.directory.empty": "Nenhuma pasta encontrada",
+  "dialog.directory.action.selectFile": "Selecionar arquivo",
+  "dialog.directory.action.selectFolder": "Selecionar pasta",
+  "dialog.directory.root": "Raiz",
+  "dialog.directory.parent": "Pasta superior",
+  "dialog.directory.readError": "Não foi possível ler esta pasta",
  "dialog.server.title": "Servidores",
  "dialog.server.description": "Trocar para qual servidor OpenCode este aplicativo se conecta.",
  "dialog.server.search.placeholder": "Buscar servidores",
@@ -307,6 +307,11 @@ export const dict = {

  "dialog.directory.search.placeholder": "Pretraži foldere",
  "dialog.directory.empty": "Nema pronađenih foldera",
+  "dialog.directory.action.selectFile": "Odaberi datoteku",
+  "dialog.directory.action.selectFolder": "Odaberi folder",
+  "dialog.directory.root": "Korijen",
+  "dialog.directory.parent": "Nadređeni folder",
+  "dialog.directory.readError": "Nije moguće pročitati ovaj folder",

  "dialog.server.title": "Serveri",
  "dialog.server.description": "Promijeni na koji se OpenCode server ova aplikacija povezuje.",
@@ -305,6 +305,11 @@ export const dict = {

  "dialog.directory.search.placeholder": "Søg mapper",
  "dialog.directory.empty": "Ingen mapper fundet",
+  "dialog.directory.action.selectFile": "Vælg fil",
+  "dialog.directory.action.selectFolder": "Vælg mappe",
+  "dialog.directory.root": "Rod",
+  "dialog.directory.parent": "Overordnet",
+  "dialog.directory.readError": "Denne mappe kan ikke læses",

  "dialog.server.title": "Servere",
  "dialog.server.description": "Skift hvilken OpenCode-server denne app forbinder til.",
@@ -287,6 +287,11 @@ export const dict = {
  "dialog.fork.empty": "Keine Nachrichten zum Abzweigen vorhanden",
  "dialog.directory.search.placeholder": "Ordner durchsuchen",
  "dialog.directory.empty": "Keine Ordner gefunden",
+  "dialog.directory.action.selectFile": "Datei auswählen",
+  "dialog.directory.action.selectFolder": "Ordner auswählen",
+  "dialog.directory.root": "Stammverzeichnis",
+  "dialog.directory.parent": "Übergeordnet",
+  "dialog.directory.readError": "Dieser Ordner kann nicht gelesen werden",
  "dialog.server.title": "Server",
  "dialog.server.description": "Wechseln Sie den OpenCode-Server, mit dem sich diese App verbindet.",
  "dialog.server.search.placeholder": "Server durchsuchen",
@@ -313,6 +313,11 @@ export const dict = {

  "dialog.directory.search.placeholder": "Search folders",
  "dialog.directory.empty": "No folders found",
+  "dialog.directory.action.selectFile": "Select file",
+  "dialog.directory.action.selectFolder": "Select folder",
+  "dialog.directory.root": "Root",
+  "dialog.directory.parent": "Parent",
+  "dialog.directory.readError": "Unable to read this folder",

  "app.server.unreachable": "Could not reach {{server}}",
  "app.server.retrying": "Retrying automatically...",
@@ -825,17 +830,17 @@ export const dict = {
  "settings.general.row.followup.option.queue": "Queue",
  "settings.general.row.followup.option.steer": "Steer",
  "settings.general.row.showFileTree.title": "File tree",
-  "settings.general.row.showFileTree.description": "Show the file tree panel in desktop sessions",
+  "settings.general.row.showFileTree.description": "Show the file tree panel in sessions",
  "settings.general.row.showNavigation.title": "Navigation controls",
  "settings.general.row.showNavigation.description": "Show the back and forward buttons in the desktop title bar",
  "settings.general.row.showSearch.title": "Command palette",
-  "settings.general.row.showSearch.description": "Show the search and command palette button in the desktop title bar",
+  "settings.general.row.showSearch.description": "Show the search and command palette button in the title bar",
  "settings.general.row.showTerminal.title": "Terminal",
  "settings.general.row.showTerminal.description": "Show the terminal button in the desktop title bar",
  "settings.general.row.showStatus.title": "Server status",
-  "settings.general.row.showStatus.description": "Show the server status button in the desktop title bar",
+  "settings.general.row.showStatus.description": "Show the server status button in the title bar",
  "settings.general.row.showCustomAgents.title": "Custom agents",
-  "settings.general.row.showCustomAgents.description": "Show the agent picker in the v2 desktop composer",
+  "settings.general.row.showCustomAgents.description": "Show the agent picker in the composer",
  "settings.general.row.reasoningSummaries.title": "Show reasoning summaries",
  "settings.general.row.reasoningSummaries.description": "Display model reasoning summaries in the timeline",
  "settings.general.row.shellToolPartsExpanded.title": "Expand shell tool parts",
@@ -306,6 +306,11 @@ export const dict = {

  "dialog.directory.search.placeholder": "Buscar carpetas",
  "dialog.directory.empty": "No se encontraron carpetas",
+  "dialog.directory.action.selectFile": "Seleccionar archivo",
+  "dialog.directory.action.selectFolder": "Seleccionar carpeta",
+  "dialog.directory.root": "Raíz",
+  "dialog.directory.parent": "Superior",
+  "dialog.directory.readError": "No se puede leer esta carpeta",

  "dialog.server.title": "Servidores",
  "dialog.server.description": "Cambiar a qué servidor de OpenCode se conecta esta app.",
@@ -282,6 +282,11 @@ export const dict = {
  "dialog.fork.empty": "Aucun message à partir duquel bifurquer",
  "dialog.directory.search.placeholder": "Rechercher des dossiers",
  "dialog.directory.empty": "Aucun dossier trouvé",
+  "dialog.directory.action.selectFile": "Sélectionner le fichier",
+  "dialog.directory.action.selectFolder": "Sélectionner le dossier",
+  "dialog.directory.root": "Racine",
+  "dialog.directory.parent": "Parent",
+  "dialog.directory.readError": "Impossible de lire ce dossier",
  "dialog.server.title": "Serveurs",
  "dialog.server.description": "Changez le serveur OpenCode auquel cette application se connecte.",
  "dialog.server.search.placeholder": "Rechercher des serveurs",
--- a/Show More
+++ b/Show More