vercel/ai

Description

Description

When using the xAI Responses API with streaming, a ZodError is thrown because the xaiResponsesChunkSchema is missing several event types that the API actually returns.

Error Message

ZodError: Invalid input: expected "response.code_interpreter_call.interpreting"

The full error shows multiple missing event types in the union schema validation.

Missing Event Types

The following event types are returned by the xAI API but not defined in the schema:

1. response.code_interpreter_call.interpreting
2. response.code_interpreter_call_code.delta
3. response.code_interpreter_call_code.done
4. response.custom_tool_call_input.delta
5. response.custom_tool_call_input.done

Additional Issue: Duplicate Output

There's also a duplicate text output issue. The message type is processed in both response.output_item.added and response.output_item.done events, causing the same text to be rendered twice.

Suggested Fix

1. Add missing event schemas to xaiResponsesChunkSchema:

// code_interpreter interpreting state
z.object({
  type: z.literal("response.code_interpreter_call.interpreting"),
  item_id: z.string(),
  output_index: z.number()
}),
// code_interpreter code streaming delta
z.object({
  type: z.literal("response.code_interpreter_call_code.delta"),
  item_id: z.string(),
  output_index: z.number(),
  delta: z.string()
}),
// code_interpreter code done
z.object({
  type: z.literal("response.code_interpreter_call_code.done"),
  item_id: z.string(),
  output_index: z.number(),
  code: z.string()
}),
// custom_tool_call input delta
z.object({
  type: z.literal("response.custom_tool_call_input.delta"),
  item_id: z.string(),
  output_index: z.number(),
  delta: z.string()
}),
// custom_tool_call input done
z.object({
  type: z.literal("response.custom_tool_call_input.done"),
  item_id: z.string(),
  output_index: z.number(),
  input: z.string()
}),
Fix duplicate output by only processing message type on added event:
// Before
if (part.type === "message") {

// After
if (part.type === "message" && event.type === "response.output_item.added") {

### AI SDK Version

@ai-sdk/xai: 3.0.0-beta.53
ai: 6.0.0-beta.x

### Code of Conduct

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