ResponseFormat

Requested format for LLM completion output (structured output).

When set in CompletionOptions.responseFormat, the provider is asked to return output in the specified format. Support is provider- and model-dependent; see CompletionOptions ScalaDoc for capability validation and fallback behavior.

• '''Json''': Generic JSON object mode; the model is instructed to return valid JSON.
• '''JsonSchema(schema)''': Provider-specific JSON schema; the model's output is constrained to match the given schema where supported.