FastAPI-MCP

Name: FastAPI-MCP
Author: tadata-org

@tadata-org

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FastAPI-MCP について

Expose your FastAPI endpoints as Model Context Protocol (MCP) tools, with Auth!

#ai #authentication #mcp #openapi #authorization #cursor #claude #windsurf #fastapi #llm #mcp-servers #mcp-server #modelcontextprotocol

基本情報

カテゴリ

開発者ツール

ライセンス

MIT

ランタイム

python

トランスポート

stdio

公開者

tadata-org

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概要

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.