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FastAPI-MCP

A zero-configuration tool for automatically exposing FastAPI endpoints as Model Context Protocol (MCP) tools.

\n\n[![PyPI version](https://badge.fury.io/py/fastapi-mcp.svg)](https://pypi.org/project/fastapi-mcp/)\n[![Python Versions](https://img.shields.io/pypi/pyversions/fastapi-mcp.svg)](https://pypi.org/project/fastapi-mcp/)\n[![FastAPI](https://img.shields.io/badge/FastAPI-009485.svg?logo=fastapi&logoColor=white)](#)\n![](https://badge.mcpx.dev?type=dev 'MCP Dev')\n\n

\n\n

$\"fastapi-mcp-usage\"$

\n\n\n## Features\n\n- **Direct integration** - Mount an MCP server directly to your FastAPI app\n- **Zero configuration** required - just point it at your FastAPI app and it works\n- **Automatic discovery** of all FastAPI endpoints and conversion to MCP tools\n- **Preserving schemas** of your request models and response models\n- **Preserve documentation** of all your endpoints, just as it is in Swagger\n- **Extend** - Add custom MCP tools alongside the auto-generated ones\n\n## Installation\n\nWe recommend using [uv](https://docs.astral.sh/uv/), a fast Python package installer:\n\n```bash\nuv add fastapi-mcp\n```\n\nAlternatively, you can install with pip:\n\n```bash\npip install fastapi-mcp\n```\n\n## Basic Usage\n\nThe simplest way to use FastAPI-MCP is to add an MCP server directly to your FastAPI application:\n\n```python\nfrom fastapi import FastAPI\nfrom fastapi_mcp import add_mcp_server\n\n# Your FastAPI app\napp = FastAPI()\n\n# Mount the MCP server to your app\nadd_mcp_server(\n app, # Your FastAPI app\n mount_path=\"/mcp\", # Where to mount the MCP server\n name=\"My API MCP\", # Name for the MCP server\n)\n```\n\nThat's it! Your auto-generated MCP server is now available at `https://app.base.url/mcp`.\n\n## Advanced Usage\n\nFastAPI-MCP provides several ways to customize and control how your MCP server is created and configured. Here are some advanced usage patterns:\n\n```python\nfrom fastapi import FastAPI\nfrom fastapi_mcp import add_mcp_server\n\napp = FastAPI()\n\nmcp_server = add_mcp_server(\n app, # Your FastAPI app\n mount_path=\"/mcp\", # Where to mount the MCP server\n name=\"My API MCP\", # Name for the MCP server\n describe_all_responses=True, # False by default. Include all possible response schemas in tool descriptions, instead of just the successful response.\n describe_full_response_schema=True # False by default. Include full JSON schema in tool descriptions, instead of just an LLM-friendly response example.\n)\n\n# Optionally add custom tools in addition to existing APIs.\n@mcp_server.tool()\nasync def get_server_time() -> str:\n \"\"\"Get the current server time.\"\"\"\n from datetime import datetime\n return datetime.now().isoformat()\n```\n\n## Examples\n\nSee the [examples](examples) directory for complete examples.\n\n## Connecting to the MCP Server using SSE\n\nOnce your FastAPI app with MCP integration is running, you can connect to it with any MCP client supporting SSE, such as Cursor:\n\n1. Run your application.\n\n2. In Cursor -> Settings -> MCP, use the URL of your MCP server endpoint (e.g., `http://localhost:8000/mcp`) as sse.\n\n3. Cursor will discover all available tools and resources automatically.\n\n## Connecting to the MCP Server using [mcp-proxy stdio](https://github.com/sparfenyuk/mcp-proxy?tab=readme-ov-file#1-stdio-to-sse) \n\nIf your MCP client does not support SSE, for example Claude Desktop: \n\n1. Run your application.\n\n2. Install [mcp-proxy](https://github.com/sparfenyuk/mcp-proxy?tab=readme-ov-file#installing-via-pypi), for example: `uv tool install mcp-proxy`.\n\n3. Add in Claude Desktop MCP config file (`claude_desktop_config.json`):\n\nOn Windows:\n```json\n{\n \"mcpServers\": {\n \"my-api-mcp-proxy\": {\n \"command\": \"mcp-proxy\",\n \"args\": [\"http://127.0.0.1:8000/mcp\"]\n }\n }\n}\n```\nOn MacOS: \n```json\n{\n \"mcpServers\": {\n \"my-api-mcp-proxy\": {\n \"command\": \"/Full/Path/To/Your/Executable/mcp-proxy\",\n \"args\": [\"http://127.0.0.1:8000/mcp\"]\n }\n }\n}\n```\nFind the path to mcp-proxy by running in Terminal: `which mcp-proxy`.\n\n4. Claude Desktop will discover all available tools and resources automatically\n\n## Development and Contributing\n\nThank you for considering contributing to FastAPI-MCP open source projects! It’s people like you that make it a reality for users in our community.\n\nBefore you get started, please see [CONTRIBUTING.md](CONTRIBUTING.md).\n\n## Community\n\nJoin [MCParty Slack community](https://join.slack.com/t/themcparty/shared_invite/zt-30yxr1zdi-2FG~XjBA0xIgYSYuKe7~Xg) to connect with other MCP enthusiasts, ask questions, and share your experiences with FastAPI-MCP.\n\n## Requirements\n\n- Python 3.10+\n- uv\n\n## License\n\nMIT License. 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