fix(llm): preserve native continuation metadata (#28678)

packages/opencode/src/session/llm/native-request.ts

@@ -42,10 +42,15 @@ const providerMetadata = (value: unknown): ProviderMetadata | undefined => {
   return Object.keys(result).length === 0 ? undefined : result
 }
 
+// Stored AI SDK parts historically kept provider-owned continuation metadata in
+// `providerOptions`; native parts now use `providerMetadata` directly.
+const partProviderMetadata = (part: Record<string, unknown>) =>
+  providerMetadata(part.providerMetadata) ?? providerMetadata(part.providerOptions)
+
 const textPart = (part: Record<string, unknown>) => ({
   type: "text" as const,
   text: typeof part.text === "string" ? part.text : "",
-  providerMetadata: providerMetadata(part.providerOptions),
+  providerMetadata: partProviderMetadata(part),
 })
 
 const mediaPart = (part: Record<string, unknown>) => {
@@ -68,7 +73,7 @@ const toolResult = (part: Record<string, unknown>) => {
     result: "value" in output ? output.value : output,
     resultType: type,
     providerExecuted: typeof part.providerExecuted === "boolean" ? part.providerExecuted : undefined,
-    providerMetadata: providerMetadata(part.providerOptions),
+    providerMetadata: partProviderMetadata(part),
   })
 }
 
@@ -80,7 +85,7 @@ const contentPart = (part: unknown) => {
     return {
       type: "reasoning" as const,
       text: typeof part.text === "string" ? part.text : "",
-      providerMetadata: providerMetadata(part.providerOptions),
+      providerMetadata: partProviderMetadata(part),
     }
   if (part.type === "tool-call")
     return ToolCallPart.make({
@@ -88,7 +93,7 @@ const contentPart = (part: unknown) => {
       name: typeof part.toolName === "string" ? part.toolName : "",
       input: part.input,
       providerExecuted: typeof part.providerExecuted === "boolean" ? part.providerExecuted : undefined,
-      providerMetadata: providerMetadata(part.providerOptions),
+      providerMetadata: partProviderMetadata(part),
     })
   if (part.type === "tool-result") return toolResult(part)
   throw new Error(`Native LLM request adapter does not support ${String(part.type)} content parts`)

packages/opencode/test/session/llm-native.test.ts

@@ -219,6 +219,42 @@ describe("session.llm-native.request", () => {
     ])
   })
 
+  test("maps stored provider metadata to native content metadata", () => {
+    const reasoning = Object.assign(
+      { type: "reasoning" as const, text: "thinking" },
+      {
+        providerMetadata: {
+          openai: {
+            itemId: "rs_1",
+            reasoningEncryptedContent: "encrypted-state",
+          },
+        },
+      },
+    )
+    const request = LLMNative.request({
+      model: baseModel,
+      messages: [
+        {
+          role: "assistant",
+          content: [reasoning],
+        },
+      ],
+    })
+
+    expect(request.messages).toMatchObject([
+      {
+        role: "assistant",
+        content: [
+          {
+            type: "reasoning",
+            text: "thinking",
+            providerMetadata: { openai: { itemId: "rs_1", reasoningEncryptedContent: "encrypted-state" } },
+          },
+        ],
+      },
+    ])
+  })
+
   test("selects native request routes for provider packages", () => {
     const openai = LLMNative.model({
       model: { ...baseModel, api: { ...baseModel.api, url: "", npm: "@ai-sdk/openai" } },