Function agent_response_output_schema_json 

pub fn agent_response_output_schema_json(
    required_policy: SchemaRequiredPolicy,
) -> String

Returns a pretty-printed JSON Schema string for prompt instruction templating.

This is used by prompt builders for providers that cannot enforce outputSchema at transport level and must be guided by in-prompt schema text instead, or by native schema-validation flags that accept a serialized schema document.