withStructuredOutput

Returns a Runnable that forces the model to produce output conforming to outputSchema (a Zod schema or plain JSON Schema object).

The extraction strategy (JSON Schema response format, function calling, or JSON mode) is chosen automatically based on model capabilities — see resolveOpenRouterStructuredOutputMethod. You can override this via config.method.

When config.includeRaw is true the returned object contains both the raw BaseMessage and the parsed output, with a fallback that sets parsed: null if the parser throws.