FastMCP v2 🚀

by jlowin

26k stars

5.6k downloads

Not rated

GitHub Website

About

A fast, Pythonic framework for building MCP servers and clients.

Details

Author: jlowin
GitHub stars: 26,014
Downloads: 5,595
Categories: Developer Tools, Other, AI

- Auto-generates MCP schema, validation, and documentation from Python functions.
- Three pillars: Servers, Apps, and Clients.
- Handles transport negotiation, authentication, and protocol lifecycle.
- Best practices for MCP are built in by default.
- Supports local and remote MCP server connections.
- Interactive UI rendering for tools via Apps.

Setting up with Highlight

This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:

Download and install Highlight from highlightai.com/download
Navigate to the plugins tab and select "Add Custom Plugin"
Configure the plugin with the settings below

Plugin Name FastMCP v2 🚀

Command (node, npx, python, etc.)

Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
Enable "Start Automatically" if you want the plugin to start when Highlight launches

Setting up with Cursor

Open Cursor's settings
Navigate to the MCP section
Click "Add new Global MCP server"
Copy and paste the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

Setting up with Claude Desktop

Open Claude Desktop's settings
Go to the Integrations tab
Click "Add MCP Server"
Use the configuration below based on your operating system

Note: Make sure Claude Desktop is running before attempting to connect.

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

Setting up with Windsurf

Open Windsurf's preferences
Go to the Integrations section
Click "Add MCP Integration"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

Setting up with Cline

Open Cline's settings
Navigate to the Integrations section
Click "Add MCP Server"
Copy and paste the configuration below based on your operating system

Note: Make sure to restart Cline after adding the configuration.

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

Setting up with Goose

Open Goose's preferences
Go to the Integrations tab
Select "MCP Servers"
Click "Add New Server"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

From the repository

Install with uv pip install fastmcp. Create an FastMCP instance, decorate functions with @mcp.tool, and run the server with mcp.run(). FastMCP also provides clients to connect to any MCP server and apps that give tools interactive UIs inside the conversation.

Claude Desktop / Cursor

Paste into your MCP client config file to install this server.

{
    "mcpServers": {
        "fastmcp v2 \ud83d\ude80": {
            "fastmcp": {
                "command": "uv",
                "args": [
                    "pip",
                    "install",
                    "fastmcp"
                ]
            }
        }
    }
}

McpServers

{
    "fastmcp": {
        "command": "uv",
        "args": [
            "pip",
            "install",
            "fastmcp"
        ]
    }
}

<div align="center">  <picture> <source width="550" media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/PrefectHQ/fastmcp/main/docs/assets/brand/f-watercolor-waves-4-dark.png"> <source width="550" media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/PrefectHQ/fastmcp/main/docs/assets/brand/f-watercolor-waves-4.png"> <img width="550" alt="FastMCP Logo" src="https://raw.githubusercontent.com/PrefectHQ/fastmcp/main/docs/assets/brand/f-watercolor-waves-2.png"> </picture> # FastMCP 🚀 <strong>Move fast and make things.</strong> *Made with 💙 by [Prefect](https://www.prefect.io/)* [![Docs](https://img.shields.io/badge/docs-gofastmcp.com-blue)](https://gofastmcp.com) [![Discord](https://img.shields.io/badge/community-discord-5865F2?logo=discord&logoColor=white)](https://discord.gg/uu8dJCgttd) [![PyPI - Version](https://img.shields.io/pypi/v/fastmcp.svg)](https://pypi.org/project/fastmcp) [![Tests](https://github.com/PrefectHQ/fastmcp/actions/workflows/run-tests.yml/badge.svg)](https://github.com/PrefectHQ/fastmcp/actions/workflows/run-tests.yml) [![License](https://img.shields.io/github/license/PrefectHQ/fastmcp.svg)](https://github.com/PrefectHQ/fastmcp/blob/main/LICENSE) <a href="https://trendshift.io/repositories/21461" target="_blank"><img src="https://trendshift.io/api/badge/repositories/21461" alt="prefecthq%2Ffastmcp | Trendshift" style="width: 250px; height: 55px;" width="250" height="55"/></a> </div> --- The [Model Context Protocol](https://modelcontextprotocol.io/) (MCP) connects LLMs to tools and data. FastMCP gives you everything you need to go from prototype to production: ```python from fastmcp import FastMCP mcp = FastMCP("Demo 🚀") @mcp.tool def add(a: int, b: int) -> int: """Add two numbers""" return a + b if __name__ == "__main__": mcp.run() ``` ## Why FastMCP Building an effective MCP application is harder than it looks. FastMCP handles all of it. Declare a tool with a Python function, and the schema, validation, and documentation are generated automatically. Connect to a server with a URL, and transport negotiation, authentication, and protocol lifecycle are managed for you. You focus on your logic, and the MCP part just works: **with FastMCP, best practices are built in.** **That's why FastMCP is the standard framework for working with MCP.** FastMCP 1.0 was incorporated into the official MCP Python SDK in 2024. Today, the actively maintained standalone project is downloaded a million times a day, and some version of FastMCP powers 70% of MCP servers across all languages. FastMCP has three pillars: <table> <tr> <td align="center" valign="top" width="33%"> <a href="https://gofastmcp.com/servers/server"> <img src="https://raw.githubusercontent.com/PrefectHQ/fastmcp/main/docs/assets/images/servers-card.png" alt="Servers" /> <br /><strong>Servers</strong> </a> <br />Expose tools, resources, and prompts to LLMs. </td> <td align="center" valign="top" width="33%"> <a href="https://gofastmcp.com/apps/overview"> <img src="https://raw.githubusercontent.com/PrefectHQ/fastmcp/main/docs/assets/images/apps-card.png" alt="Apps" /> <br /><strong>Apps</strong> </a> <br />Give your tools interactive UIs rendered directly in the conversation. </td> <td align="center" valign="top" width="33%"> <a href="https://gofastmcp.com/clients/client"> <img src="https://raw.githubusercontent.com/PrefectHQ/fastmcp/main/docs/assets/images/clients-card.png" alt="Clients" /> <br /><strong>Clients</strong> </a> <br />Connect to any MCP server — local or remote, programmatic or CLI. </td> </tr> </table> **[Servers](https://gofastmcp.com/servers/server)** wrap your Python functions into MCP-compliant tools, resources, and prompts. **[Clients](https://gofastmcp.com/clients/client)** connect to any server with full protocol support. And **[Apps](https://gofastmcp.com/apps/overview)** give your tools interactive UIs rendered directly in the conversation. Ready to build? Start with the [installation guide](https://gofastmcp.com/getting-started/installation) or jump straight to the [quickstart](https://gofastmcp.com/getting-started/quickstart). ## Run FastMCP in production with Horizon FastMCP is the standard way to build MCP servers. **[Prefect Horizon](https://www.prefect.io/horizon?utm_source=github&utm_medium=readme&utm_campaign=readme_horizon&utm_content=readme_body)** is the enterprise MCP gateway for running them safely. Built by the FastMCP team, Horizon packages the best practices we've learned shipping the world's most popular MCP framework. Deploy FastMCP servers from GitHub with branch previews and instant rollback. Create a private registry of every MCP your company uses. Secure access with SSO and tool-level RBAC. Get audit logs, observability, and governance across your MCP stack. Remix approved tools into purpose-built endpoints for teams and agents. Start with FastMCP. [Scale with Horizon →](https://www.prefect.io/horizon?utm_source=github&utm_medium=readme&utm_campaign=readme_horizon&utm_content=readme_cta) ## Installation We recommend installing FastMCP with [uv](https://docs.astral.sh/uv/): ```bash uv pip install fastmcp ``` For full installation instructions, including verification and upgrading, see the [**Installation Guide**](https://gofastmcp.com/getting-started/installation). **Upgrading?** We have guides for: - [Upgrading from FastMCP v2](https://gofastmcp.com/getting-started/upgrading/from-fastmcp-2) - [Upgrading from the MCP Python SDK](https://gofastmcp.com/getting-started/upgrading/from-mcp-sdk) - [Upgrading from the low-level SDK](https://gofastmcp.com/getting-started/upgrading/from-low-level-sdk) > [!NOTE] > If `import fastmcp` fails right after a `pip` upgrade from FastMCP 3.2 or earlier, run `pip install --force-reinstall fastmcp`. See [Troubleshooting](https://gofastmcp.com/getting-started/installation#troubleshooting) for why this happens (`uv` is unaffected). ## 📚 Documentation FastMCP's complete documentation is available at **[gofastmcp.com](https://gofastmcp.com)**, including detailed guides, API references, and advanced patterns. Documentation is also available in [llms.txt format](https://llmstxt.org/), which is a simple markdown standard that LLMs can consume easily: - [`llms.txt`](https://gofastmcp.com/llms.txt) is essentially a sitemap, listing all the pages in the documentation. - [`llms-full.txt`](https://gofastmcp.com/llms-full.txt) contains the entire documentation. Note this may exceed the context window of your LLM. **Community:** Join our [Discord server](https://discord.gg/uu8dJCgttd) to connect with other FastMCP developers and share what you're building. ## Contributing We welcome contributions! See the [Contributing Guide](https://gofastmcp.com/development/contributing) for setup instructions, testing requirements, and PR guidelines.

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Setting up with Highlight

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