refactor(core): narrow provider adapter fix

packages/core/src/aisdk.ts

@@ -404,7 +404,8 @@ function text(part: ContentPart) {
 }
 
 function userPart(part: ContentPart): UserContent {
-  if (part.type === "text") return [{ type: "text", text: part.text }]
+  if (part.type === "text")
+    return [{ type: "text", text: part.text, providerOptions: providerOptions(part.providerMetadata) }]
   if (part.type === "media")
     return [{ type: "file", mediaType: part.mediaType, data: part.data, filename: part.filename }]
   return []
@@ -413,11 +414,11 @@ function userPart(part: ContentPart): UserContent {
 function assistantPart(part: ContentPart): AssistantContent {
   switch (part.type) {
     case "text":
-      return [{ type: "text", text: part.text }]
+      return [{ type: "text", text: part.text, providerOptions: providerOptions(part.providerMetadata) }]
     case "media":
       return [{ type: "file", mediaType: part.mediaType, data: part.data, filename: part.filename }]
     case "reasoning":
-      return [{ type: "reasoning", text: part.text }]
+      return [{ type: "reasoning", text: part.text, providerOptions: providerOptions(part.providerMetadata) }]
     case "tool-call":
       return [
         {
@@ -426,6 +427,7 @@ function assistantPart(part: ContentPart): AssistantContent {
           toolName: part.name,
           input: part.input,
           providerExecuted: part.providerExecuted,
+          providerOptions: providerOptions(part.providerMetadata),
         },
       ]
     case "tool-result":
@@ -441,6 +443,7 @@ function toolResultPart(part: ContentPart): ToolResultContent[] {
       toolCallId: part.id,
       toolName: part.name,
       output: toolOutput(part.result),
+      providerOptions: providerOptions(part.providerMetadata),
     },
   ]
 }

packages/core/test/aisdk.test.ts

@@ -2,7 +2,7 @@ import type { LanguageModelV3CallOptions } from "@ai-sdk/provider"
 import { AISDK } from "@opencode-ai/core/aisdk"
 import { ModelV2 } from "@opencode-ai/core/model"
 import { ProviderV2 } from "@opencode-ai/core/provider"
-import { LLM } from "@opencode-ai/llm"
+import { LLM, Message } from "@opencode-ai/llm"
 import { LLMClient } from "@opencode-ai/llm/route"
 import { expect } from "bun:test"
 import { Effect } from "effect"
@@ -67,3 +67,55 @@ it.effect("projects request settings, headers, and body overlays", () =>
     expect(body).toEqual({ safety_setting: "strict" })
   }),
 )
+
+it.effect("preserves content provider metadata when lowering requests", () =>
+  Effect.gen(function* () {
+    const aisdk = yield* AISDK.Service
+    yield* aisdk.hook.sdk((event) => {
+      event.sdk = { languageModel: () => ({ provider: event.model.providerID }) }
+    })
+
+    const resolved = yield* aisdk.model(model("@ai-sdk/google"))
+    const prepared = yield* LLMClient.prepare<LanguageModelV3CallOptions>(
+      LLM.request({
+        model: resolved,
+        messages: [
+          Message.assistant([
+            {
+              type: "reasoning",
+              text: "thinking",
+              providerMetadata: { google: { thoughtSignature: "signature" } },
+            },
+            {
+              type: "tool-call",
+              id: "call-1",
+              name: "bash",
+              input: { command: "pwd" },
+              providerMetadata: { google: { itemId: "item-1" } },
+            },
+          ]),
+        ],
+      }),
+    )
+
+    expect(prepared.body.prompt).toMatchObject([
+      {
+        role: "assistant",
+        content: [
+          {
+            type: "reasoning",
+            text: "thinking",
+            providerOptions: { google: { thoughtSignature: "signature" } },
+          },
+          {
+            type: "tool-call",
+            toolCallId: "call-1",
+            toolName: "bash",
+            input: { command: "pwd" },
+            providerOptions: { google: { itemId: "item-1" } },
+          },
+        ],
+      },
+    ])
+  }),
+)