fix(core): preserve the first terminal failure (#37705)

packages/ai/src/protocols/utils/tool-stream.ts

@@ -84,8 +84,6 @@ const toolCall = (route: string, tool: PendingTool, inputOverride?: string) => {
               id: tool.id,
               name: tool.name,
               raw,
-              message: error.reason.message,
-              providerMetadata: tool.providerMetadata,
             }),
           ),
     ),

packages/ai/src/schema/events.ts

@@ -150,14 +150,12 @@ export const ToolInputEnd = Schema.Struct({
 }).annotate({ identifier: "LLM.Event.ToolInputEnd" })
 export type ToolInputEnd = Schema.Schema.Type<typeof ToolInputEnd>
 
-/** A local tool call that could not be decoded. `raw` is diagnostic-only. */
+/** A local tool call whose final input could not be decoded. */
 export const ToolInputError = Schema.Struct({
   type: Schema.tag("tool-input-error"),
   id: ToolCallID,
   name: Schema.String,
   raw: Schema.String,
-  message: Schema.String,
-  providerMetadata: Schema.optional(ProviderMetadata),
 }).annotate({ identifier: "LLM.Event.ToolInputError" })
 export type ToolInputError = Schema.Schema.Type<typeof ToolInputError>
 

packages/ai/test/provider/openai-responses.test.ts

@@ -1290,8 +1290,6 @@ describe("OpenAI Responses route", () => {
         id: "call_1",
         name: "lookup",
         raw: '{"query":"partial',
-        message: "Invalid JSON input for openai-responses tool call lookup",
-        providerMetadata: { openai: { itemId: "item_1" } },
       })
       expect(response.finishReason).toBe("tool-calls")
       expect(response.events.some(LLMEvent.is.toolCall)).toBeFalse()

packages/ai/test/response.test.ts

@@ -104,7 +104,6 @@ describe("LLMResponse reducer", () => {
         id: "call_1",
         name: "lookup",
         raw: '{"query":"partial',
-        message: "Invalid JSON input",
       }),
     ])
 

packages/ai/test/tool-stream.test.ts

@@ -81,7 +81,6 @@ describe("ToolStream", () => {
             id: "call_1",
             name: "lookup",
             raw: '{"query":"partial',
-            message: "Invalid JSON input for test-route tool call lookup",
           },
         ],
       })
@@ -112,7 +111,6 @@ describe("ToolStream", () => {
             id: "call_invalid",
             name: "lookup",
             raw: '{"query":"partial',
-            message: "Invalid JSON input for test-route tool call lookup",
           },
         ],
       })