schemas

fastmcp.utilities.openapi.schemas

Schema manipulation utilities for OpenAPI operations.

Functions

clean_schema_for_display

clean_schema_for_display(schema: JsonSchema | None) -> JsonSchema | None

Clean up a schema dictionary for display by removing internal/complex fields.

extract_output_schema_from_responses

extract_output_schema_from_responses(responses: dict[str, ResponseInfo], schema_definitions: dict[str, Any] | None = None, openapi_version: str | None = None) -> dict[str, Any] | None

Extract output schema from OpenAPI responses for use as MCP tool output schema.

This function finds the first successful response (200, 201, 202, 204) with a JSON-compatible content type and extracts its schema. If the schema is not an object type, it wraps it to comply with MCP requirements.

Args:

• responses: Dictionary of ResponseInfo objects keyed by status code
• schema_definitions: Optional schema definitions to include in the output schema
• openapi_version: OpenAPI version string, used to optimize nullable field handling

Returns:

• MCP-compliant output schema with potential wrapping, or None if no suitable schema found