test(core): simplify session projector layer wiring

packages/core/src/instruction-context.ts

@@ -9,7 +9,6 @@ import { Location } from "./location"
 import { AbsolutePath } from "./schema"
 import { SystemContext } from "./system-context/index"
 import { SystemContextRegistry } from "./system-context/registry"
-import { LayerNode } from "./effect/layer-node"
 
 class File extends Schema.Class<File>("InstructionContext.File")({
   path: AbsolutePath,
@@ -88,9 +87,6 @@ export const layer = Layer.effectDiscard(
   }),
 )
 
-export const node = (location: LayerNode.Node<Location.Service>) =>
-  LayerNode.make(layer, [FSUtil.node, Global.node, location, SystemContextRegistry.node])
-
 function render(files: ReadonlyArray<File>) {
   return files.map((file) => `Instructions from: ${file.path}\n${file.content}`).join("\n\n")
 }

packages/core/src/session.ts

@@ -3,6 +3,7 @@ export * from "./session/schema"
 
 import { Cause, DateTime, Effect, Layer, Schema, Context, Stream } from "effect"
 import { and, asc, desc, eq, gt, like, lt, or, type SQL } from "drizzle-orm"
+import { LayerNode } from "./effect/layer-node"
 import { ProjectV2 } from "./project"
 import { WorkspaceV2 } from "./workspace"
 import { ModelV2 } from "./model"
@@ -434,3 +435,11 @@ export const defaultLayer = layer.pipe(
   Layer.provide(ProjectV2.defaultLayer),
   Layer.orDie,
 )
+export const node = LayerNode.make(layer.pipe(Layer.orDie), [
+  Database.node,
+  EventV2.node,
+  ProjectV2.node,
+  SessionExecution.noopNode,
+  SessionProjector.node,
+  SessionStore.node,
+])

packages/core/src/session/execution.ts

@@ -1,6 +1,7 @@
 export * as SessionExecution from "./execution"
 
 import { Context, Effect, Layer } from "effect"
+import { LayerNode } from "../effect/layer-node"
 import { SessionRunner } from "./runner/index"
 import { SessionSchema } from "./schema"
 
@@ -21,3 +22,4 @@ export const noopLayer = Layer.succeed(
   Service,
   Service.of({ resume: () => Effect.void, wake: () => Effect.void, interrupt: () => Effect.void }),
 )
+export const noopNode = LayerNode.make(noopLayer, [])

packages/core/src/session/store.ts

@@ -3,6 +3,7 @@ export * as SessionStore from "./store"
 import { eq } from "drizzle-orm"
 import { Context, Effect, Layer, Schema } from "effect"
 import { Database } from "../database/database"
+import { LayerNode } from "../effect/layer-node"
 import { SessionHistory } from "./history"
 import { MessageDecodeError } from "./error"
 import { SessionMessage } from "./message"
@@ -60,3 +61,4 @@ export const layer = Layer.effect(
 )
 
 export const defaultLayer = layer.pipe(Layer.provide(Database.defaultLayer))
+export const node = LayerNode.make(layer, [Database.node])

packages/core/src/system-context/registry.ts

@@ -1,7 +1,6 @@
 export * as SystemContextRegistry from "./registry"
 
 import { Context, Effect, Layer, Ref, Scope } from "effect"
-import { LayerNode } from "../effect/layer-node"
 import { SystemContext } from "./index"
 
 export interface Entry {
@@ -45,5 +44,3 @@ export const layer = Layer.effect(
     })
   }),
 )
-
-export const node = LayerNode.make(layer, [])

packages/core/test/instruction-context.test.ts

@@ -5,7 +5,6 @@ import path from "path"
 import { FSUtil } from "@opencode-ai/core/fs-util"
 import { Global } from "@opencode-ai/core/global"
 import { InstructionContext } from "@opencode-ai/core/instruction-context"
-import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { Location } from "@opencode-ai/core/location"
 import { AbsolutePath } from "@opencode-ai/core/schema"
 import { SystemContext } from "@opencode-ai/core/system-context"
@@ -14,28 +13,7 @@ import { location } from "./fixture/location"
 import { tmpdir } from "./fixture/tmpdir"
 import { testEffect } from "./lib/effect"
 
-const it = testEffect(LayerNode.buildLayer(FSUtil.node))
-
-function provide(options: {
-  global: string
-  location: Location.Interface
-  filesystem?: FSUtil.Interface
-}) {
-  const location = LayerNode.make(
-    Layer.succeed(Location.Service, Location.Service.of(options.location)),
-    [],
-  )
-  return Effect.provide(
-    LayerNode.buildLayer(LayerNode.group([InstructionContext.node(location), SystemContextRegistry.node]), {
-      replacements: [
-        LayerNode.replace(Global.node, Global.layerWith({ config: options.global })),
-        ...(options.filesystem
-          ? [LayerNode.replace(FSUtil.node, Layer.succeed(FSUtil.Service, FSUtil.Service.of(options.filesystem)))]
-          : []),
-      ],
-    }),
-  )
-}
+const it = testEffect(Layer.empty)
 
 describe("InstructionContext", () => {
   it.live("loads global and upward project AGENTS.md files as one aggregate context", () =>
@@ -63,13 +41,20 @@ describe("InstructionContext", () => {
 
           const load = SystemContextRegistry.Service.pipe(
             Effect.flatMap((service) => service.load()),
-            provide({
-              global,
-              location: location(
-                { directory: AbsolutePath.make(directory) },
-                { projectDirectory: AbsolutePath.make(project) },
+            Effect.provide(InstructionContext.layer.pipe(Layer.provideMerge(SystemContextRegistry.layer))),
+            Effect.provide(FSUtil.defaultLayer),
+            Effect.provide(Global.layerWith({ config: global })),
+            Effect.provide(
+              Layer.succeed(
+                Location.Service,
+                Location.Service.of(
+                  location(
+                    { directory: AbsolutePath.make(directory) },
+                    { projectDirectory: AbsolutePath.make(project) },
+                  ),
+                ),
               ),
-            }),
+            ),
           )
 
           const initialized = yield* SystemContext.initialize(yield* load)
@@ -122,10 +107,15 @@ describe("InstructionContext", () => {
           yield* Effect.promise(() => fs.writeFile(file, ""))
           const context = yield* SystemContextRegistry.Service.pipe(
             Effect.flatMap((service) => service.load()),
-            provide({
-              global: path.join(tmp.path, "global"),
-              location: location({ directory: AbsolutePath.make(tmp.path) }),
-            }),
+            Effect.provide(InstructionContext.layer.pipe(Layer.provideMerge(SystemContextRegistry.layer))),
+            Effect.provide(FSUtil.defaultLayer),
+            Effect.provide(Global.layerWith({ config: path.join(tmp.path, "global") })),
+            Effect.provide(
+              Layer.succeed(
+                Location.Service,
+                Location.Service.of(location({ directory: AbsolutePath.make(tmp.path) })),
+              ),
+            ),
           )
 
           expect((yield* SystemContext.initialize(context)).baseline).toBe(`Instructions from: ${file}\n`)
@@ -136,14 +126,22 @@ describe("InstructionContext", () => {
 
   it.effect("preserves admitted instructions while observation is unavailable", () =>
     Effect.gen(function* () {
-      const fs = yield* FSUtil.Service
+      const failingFS = Layer.effect(
+        FSUtil.Service,
+        FSUtil.Service.pipe(
+          Effect.map((fs) =>
+            FSUtil.Service.of({ ...fs, up: () => Effect.fail(new FSUtil.FileSystemError({ method: "up" })) }),
+          ),
+        ),
+      ).pipe(Layer.provide(FSUtil.defaultLayer))
       const context = yield* SystemContextRegistry.Service.pipe(
         Effect.flatMap((service) => service.load()),
-        provide({
-          global: "/global",
-          location: location({ directory: AbsolutePath.make("/repo") }),
-          filesystem: { ...fs, up: () => Effect.fail(new FSUtil.FileSystemError({ method: "up" })) },
-        }),
+        Effect.provide(InstructionContext.layer.pipe(Layer.provideMerge(SystemContextRegistry.layer))),
+        Effect.provide(failingFS),
+        Effect.provide(Global.layerWith({ config: "/global" })),
+        Effect.provide(
+          Layer.succeed(Location.Service, Location.Service.of(location({ directory: AbsolutePath.make("/repo") }))),
+        ),
       )
 
       expect(
@@ -160,18 +158,26 @@ describe("InstructionContext", () => {
   it.effect("preserves admitted instructions when a discovered file disappears before read", () =>
     Effect.gen(function* () {
       const file = AbsolutePath.make("/repo/AGENTS.md")
-      const fs = yield* FSUtil.Service
+      const racingFS = Layer.effect(
+        FSUtil.Service,
+        FSUtil.Service.pipe(
+          Effect.map((fs) =>
+            FSUtil.Service.of({
+              ...fs,
+              up: () => Effect.succeed([file]),
+              readFileStringSafe: () => Effect.succeed(undefined),
+            }),
+          ),
+        ),
+      ).pipe(Layer.provide(FSUtil.defaultLayer))
       const context = yield* SystemContextRegistry.Service.pipe(
         Effect.flatMap((service) => service.load()),
-        provide({
-          global: "/global",
-          location: location({ directory: AbsolutePath.make("/repo") }),
-          filesystem: {
-            ...fs,
-            up: () => Effect.succeed([file]),
-            readFileStringSafe: () => Effect.succeed(undefined),
-          },
-        }),
+        Effect.provide(InstructionContext.layer.pipe(Layer.provideMerge(SystemContextRegistry.layer))),
+        Effect.provide(racingFS),
+        Effect.provide(Global.layerWith({ config: "/global" })),
+        Effect.provide(
+          Layer.succeed(Location.Service, Location.Service.of(location({ directory: AbsolutePath.make("/repo") }))),
+        ),
       )
 
       expect(
@@ -188,25 +194,35 @@ describe("InstructionContext", () => {
   it.effect("canonicalizes upward discovery boundaries", () =>
     Effect.gen(function* () {
       let observed: { targets: string[]; start: string; stop?: string } | undefined
-      const fs = yield* FSUtil.Service
+      const observingFS = Layer.effect(
+        FSUtil.Service,
+        FSUtil.Service.pipe(
+          Effect.map((fs) =>
+            FSUtil.Service.of({
+              ...fs,
+              up: (options) =>
+                Effect.sync(() => {
+                  observed = options
+                  return []
+                }),
+            }),
+          ),
+        ),
+      ).pipe(Layer.provide(FSUtil.defaultLayer))
 
       yield* SystemContextRegistry.Service.pipe(
         Effect.flatMap((service) => service.load()),
-        provide({
-          global: "/global",
-          location: location(
-            { directory: AbsolutePath.make("/repo/") },
-            { projectDirectory: AbsolutePath.make("/repo") },
+        Effect.provide(InstructionContext.layer.pipe(Layer.provideMerge(SystemContextRegistry.layer))),
+        Effect.provide(observingFS),
+        Effect.provide(Global.layerWith({ config: "/global" })),
+        Effect.provide(
+          Layer.succeed(
+            Location.Service,
+            Location.Service.of(
+              location({ directory: AbsolutePath.make("/repo/") }, { projectDirectory: AbsolutePath.make("/repo") }),
+            ),
           ),
-          filesystem: {
-            ...fs,
-            up: (options) =>
-              Effect.sync(() => {
-                observed = options
-                return []
-              }),
-          },
-        }),
+        ),
       )
 
       expect(observed).toEqual({
@@ -222,15 +238,22 @@ describe("InstructionContext", () => {
       const previous = process.env.OPENCODE_DISABLE_PROJECT_CONFIG
       let scanned = false
       process.env.OPENCODE_DISABLE_PROJECT_CONFIG = "1"
-      const fs = yield* FSUtil.Service
 
       yield* SystemContextRegistry.Service.pipe(
         Effect.flatMap((service) => service.load()),
-        provide({
-          global: "/global",
-          location: location({ directory: AbsolutePath.make("/repo") }),
-          filesystem: { ...fs, up: () => Effect.sync(() => ((scanned = true), [])) },
-        }),
+        Effect.provide(InstructionContext.layer.pipe(Layer.provideMerge(SystemContextRegistry.layer))),
+        Effect.provide(
+          Layer.effect(
+            FSUtil.Service,
+            FSUtil.Service.pipe(
+              Effect.map((fs) => FSUtil.Service.of({ ...fs, up: () => Effect.sync(() => ((scanned = true), [])) })),
+            ),
+          ).pipe(Layer.provide(FSUtil.defaultLayer)),
+        ),
+        Effect.provide(Global.layerWith({ config: "/global" })),
+        Effect.provide(
+          Layer.succeed(Location.Service, Location.Service.of(location({ directory: AbsolutePath.make("/repo") }))),
+        ),
         Effect.ensuring(
           Effect.sync(() => {
             if (previous === undefined) delete process.env.OPENCODE_DISABLE_PROJECT_CONFIG
@@ -246,17 +269,26 @@ describe("InstructionContext", () => {
   it.effect("does not discover project instructions outside the canonical project root", () =>
     Effect.gen(function* () {
       let scanned = false
-      const fs = yield* FSUtil.Service
       yield* SystemContextRegistry.Service.pipe(
         Effect.flatMap((service) => service.load()),
-        provide({
-          global: "/global",
-          location: location(
-            { directory: AbsolutePath.make("/outside") },
-            { projectDirectory: AbsolutePath.make("/repo") },
+        Effect.provide(InstructionContext.layer.pipe(Layer.provideMerge(SystemContextRegistry.layer))),
+        Effect.provide(
+          Layer.effect(
+            FSUtil.Service,
+            FSUtil.Service.pipe(
+              Effect.map((fs) => FSUtil.Service.of({ ...fs, up: () => Effect.sync(() => ((scanned = true), [])) })),
+            ),
+          ).pipe(Layer.provide(FSUtil.defaultLayer)),
+        ),
+        Effect.provide(Global.layerWith({ config: "/global" })),
+        Effect.provide(
+          Layer.succeed(
+            Location.Service,
+            Location.Service.of(
+              location({ directory: AbsolutePath.make("/outside") }, { projectDirectory: AbsolutePath.make("/repo") }),
+            ),
           ),
-          filesystem: { ...fs, up: () => Effect.sync(() => ((scanned = true), [])) },
-        }),
+        ),
       )
 
       expect(scanned).toBe(false)

packages/core/test/session-projector.test.ts

@@ -1,7 +1,8 @@
 import { describe, expect } from "bun:test"
-import { DateTime, Effect, Layer, Schema } from "effect"
+import { DateTime, Effect, Schema } from "effect"
 import { asc, eq } from "drizzle-orm"
 import { Database } from "@opencode-ai/core/database/database"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { EventV2 } from "@opencode-ai/core/event"
 import { EventTable } from "@opencode-ai/core/event/sql"
 import { ModelV2 } from "@opencode-ai/core/model"
@@ -15,16 +16,15 @@ import { SessionMessage } from "@opencode-ai/core/session/message"
 import { Prompt } from "@opencode-ai/core/session/prompt"
 import { SessionMessageUpdater } from "@opencode-ai/core/session/message-updater"
 import { SessionProjector } from "@opencode-ai/core/session/projector"
-import { SessionExecution } from "@opencode-ai/core/session/execution"
 import { SessionInput } from "@opencode-ai/core/session/input"
-import { SessionStore } from "@opencode-ai/core/session/store"
 import { SessionInputTable, SessionMessageTable, SessionTable } from "@opencode-ai/core/session/sql"
 import { testEffect } from "./lib/effect"
 
-const database = Database.layerFromPath(":memory:")
-const events = EventV2.layer.pipe(Layer.provide(database))
-const projector = SessionProjector.layer.pipe(Layer.provide(events), Layer.provide(database))
-const it = testEffect(Layer.mergeAll(database, events, projector))
+const it = testEffect(
+  LayerNode.buildLayer(LayerNode.group([SessionV2.node, Database.node, EventV2.node, SessionProjector.node]), {
+    replacements: [LayerNode.replace(Database.node, Database.layerFromPath(":memory:"))],
+  }),
+)
 const sessionID = SessionV2.ID.make("ses_projector_test")
 const created = DateTime.makeUnsafe(0)
 const model = { id: ModelV2.ID.make("model"), providerID: ProviderV2.ID.make("provider") }
@@ -110,17 +110,7 @@ describe("SessionProjector", () => {
       expect(
         (yield* sessions.context(sessionID)).map((message) => (message.type === "user" ? message.text : message.type)),
       ).toEqual(["first", "second"])
-    }).pipe(
-      Effect.provide(
-        SessionV2.layer.pipe(
-          Layer.provide(events),
-          Layer.provide(database),
-          Layer.provide(Project.defaultLayer),
-          Layer.provide(SessionStore.layer.pipe(Layer.provide(database))),
-          Layer.provide(SessionExecution.noopLayer),
-        ),
-      ),
-    ),
+    }),
   )
 
   it.effect("marks an admitted lifecycle row promoted with the PromptPromoted event sequence", () =>