Project Title

fastapi_mcp — Expose FastAPI Endpoints as MCP Tools with Authentication

Overview

FastAPI-MCP is an open-source Python library that enables developers to expose their FastAPI endpoints as Model Context Protocol (MCP) tools, complete with authentication. It is designed as a native extension of FastAPI, offering a FastAPI-first approach that leverages familiar dependencies and ASGI transport for efficient communication.

Key Features

Built-in Authentication using existing FastAPI dependencies
FastAPI-native design, not just an OpenAPI to MCP converter
Zero/Minimal configuration required
Preserves schemas of request and response models
Preserves documentation of all endpoints as in Swagger
Flexible deployment options
Uses FastAPI's ASGI interface directly for efficient communication

Use Cases

Developers looking to add MCP capabilities to their existing FastAPI services
Teams needing to secure MCP endpoints using FastAPI's authentication and authorization mechanisms
Enterprises requiring a unified infrastructure for FastAPI apps and MCP servers

Advantages

Native dependencies for authentication and authorization
Direct communication with FastAPI app using ASGI interface, eliminating the need for HTTP calls
Unified infrastructure, allowing the FastAPI app and MCP server to run together or separately

Limitations / Considerations

The project's license is currently unknown, which may affect its use in certain commercial applications
As a relatively new project, it may lack some features or have a smaller community compared to more established alternatives

OpenAPI to MCP Converters: These tools generate MCP tools from OpenAPI specifications but may not offer the same level of integration with FastAPI as FastAPI-MCP.
ASGI Frameworks: Other ASGI frameworks like Starlette or Sanic might be used for building APIs, but they do not natively support MCP like FastAPI-MCP does.
Authentication Libraries: While there are many authentication libraries for FastAPI, none provide the specific integration with MCP that FastAPI-MCP offers.