概览
What is FastAPI-MCP?
FastAPI-MCP is a Python library that exposes your FastAPI endpoints as Model Context Protocol (MCP) tools, with built-in authentication support. It is built by Tadata and targets developers who want to add MCP capabilities to existing FastAPI services with minimal friction.
How to use FastAPI-MCP?
Install with uv add fastapi-mcp or pip install fastapi-mcp. Then, in your FastAPI application, import FastApiMCP, instantiate it with your app, and call .mount() to expose the MCP server at /mcp. No further configuration is required for basic use.
Key features of FastAPI-MCP
- Authentication built in using existing FastAPI dependencies
- FastAPI-native: not just an OpenAPI-to-MCP converter
- Zero or minimal configuration required
- Preserves request and response model schemas
- Preserves endpoint documentation as in Swagger
- Flexible deployment: mount to same app or deploy separately
- Uses ASGI transport for efficient communication
Use cases of FastAPI-MCP
- Add MCP tool access to an existing FastAPI API without rewriting code
- Secure MCP endpoints using familiar FastAPI
Depends()for authentication and authorization - Deploy MCP capabilities on the same infrastructure as your FastAPI app
- Enable AI assistants to interact with your API through the Model Context Protocol
FAQ from FastAPI-MCP
How does FastAPI-MCP differ from other OpenAPI-to-MCP converters?
FastAPI-MCP is FastAPI-native—it is designed as a direct extension of FastAPI, not just a converter. It communicates via ASGI instead of making HTTP calls to your API, and it supports native FastAPI dependency injection for authentication.
What are the runtime dependencies for FastAPI-MCP?
FastAPI-MCP requires Python 3.10+ (recommended 3.12). The recommended package installer is uv, but pip also works. It depends on a running FastAPI application.
Where does the MCP server’s data live?
FastAPI-MCP does not store data itself; it exposes your existing FastAPI endpoints as MCP tools. All data and state remain within your FastAPI application and its backends.
What transport does FastAPI-MCP use?
It uses FastAPI’s ASGI interface directly for communication, eliminating the need for separate HTTP calls from the MCP server to your API.
Does FastAPI-MCP handle authentication?
Yes. It leverages your existing FastAPI Depends() for authentication and authorization, so MCP endpoints inherit the same security as your API endpoints.
