FastAPI-MCP
by tadata-org
<p align="center"><a href="https://github.com/tadata-org/fastapi_mcp"><img src="https://github.com/user-attachments/assets/609d5b8b-37a1-42c4-87e2-f045b60026b1" alt="fastapi-to-mcp" height="100"/></a></p>
<h1 align="center">FastAPI-MCP</h1>
<p align="center">A zero-configuration tool for automatically exposing FastAPI endpoints as Model Context Protocol (MCP) tools.</p>
<div align="center">
[](https://pypi.org/project/fastapi-mcp/)
[](https://pypi.org/project/fastapi-mcp/)
[](#)
</div>
<p align="center"><a href="https://github.com/tadata-org/fastapi_mcp"><img src="https://github.com/user-attachments/assets/1cba1bf2-2fa4-46c7-93ac-1e9bb1a95257" alt="fastapi-mcp-usage" height="400"/></a></p>
## Features
- **Direct integration** - Mount an MCP server directly to your FastAPI app
- **Zero configuration** required - just point it at your FastAPI app and it works
- **Automatic discovery** of all FastAPI endpoints and conversion to MCP tools
- **Preserving schemas** of your request models and response models
- **Preserve documentation** of all your endpoints, just as it is in Swagger
- **Extend** - Add custom MCP tools alongside the auto-generated ones
## Installation
We recommend using [uv](https://docs.astral.sh/uv/), a fast Python package installer:
```bash
uv add fastapi-mcp
```
Alternatively, you can install with pip:
```bash
pip install fastapi-mcp
```
## Basic Usage
The simplest way to use FastAPI-MCP is to add an MCP server directly to your FastAPI application:
```python
from fastapi import FastAPI
from fastapi_mcp import add_mcp_server
# Your FastAPI app
app = FastAPI()
# Mount the MCP server to your app
add_mcp_server(
app, # Your FastAPI app
mount_path="/mcp", # Where to mount the MCP server
name="My API MCP", # Name for the MCP server
)
```
That's it! Your auto-generated MCP server is now available at `https://app.base.url/mcp`.
## Advanced Usage
FastAPI-MCP provides several ways to customize and control how your MCP server is created and configured. Here are some advanced usage patterns:
```python
from fastapi import FastAPI
from fastapi_mcp import add_mcp_server
app = FastAPI()
mcp_server = add_mcp_server(
app, # Your FastAPI app
mount_path="/mcp", # Where to mount the MCP server
name="My API MCP", # Name for the MCP server
describe_all_responses=True, # False by default. Include all possible response schemas in tool descriptions, instead of just the successful response.
describe_full_response_schema=True # False by default. Include full JSON schema in tool descriptions, instead of just an LLM-friendly response example.
)
# Optionally add custom tools in addition to existing APIs.
@mcp_server.tool()
async def get_server_time() -> str:
"""Get the current server time."""
from datetime import datetime
return datetime.now().isoformat()
```
## Examples
See the [examples](examples) directory for complete examples.
## Connecting to the MCP Server using SSE
Once your FastAPI app with MCP integration is running, you can connect to it with any MCP client supporting SSE, such as Cursor:
1. Run your application.
2. In Cursor -> Settings -> MCP, use the URL of your MCP server endpoint (e.g., `http://localhost:8000/mcp`) as sse.
3. Cursor will discover all available tools and resources automatically.
## Connecting to the MCP Server using [mcp-proxy stdio](https://github.com/sparfenyuk/mcp-proxy?tab=readme-ov-file#1-stdio-to-sse)
If your MCP client does not support SSE, for example Claude Desktop:
1. Run your application.
2. Install [mcp-proxy](https://github.com/sparfenyuk/mcp-proxy?tab=readme-ov-file#installing-via-pypi), for example: `uv tool install mcp-proxy`.
3. Add in Claude Desktop MCP config file (`claude_desktop_config.json`):
On Windows:
```json
{
"mcpServers": {
"my-api-mcp-proxy": {
"command": "mcp-proxy",
"args": ["http://127.0.0.1:8000/mcp"]
}
}
}
```
On MacOS:
```json
{
"mcpServers": {
"my-api-mcp-proxy": {
"command": "/Full/Path/To/Your/Executable/mcp-proxy",
"args": ["http://127.0.0.1:8000/mcp"]
}
}
}
```
Find the path to mcp-proxy by running in Terminal: `which mcp-proxy`.
4. Claude Desktop will discover all available tools and resources automatically
## Development and Contributing
Thank 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.
Before you get started, please see [CONTRIBUTING.md](CONTRIBUTING.md).
## Community
Join [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.
## Requirements
- Python 3.10+
- uv
## License
MIT License. Copyright (c) 2024 Tadata Inc.
## About
Developed and maintained by [Tadata Inc.](https://github.com/tadata-org)