FastMCP v2 🚀
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
Jump to
- 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
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"
]
}
}FastMCP 🚀
<strong>Move fast and make things.</strong>
Made with 💙 by Prefect
<a href="https://trendshift.io/repositories/21461" target="_blank"></a>
</div>
---
The Model Context Protocol (MCP) connects LLMs to tools and data. FastMCP gives you everything you need to go from prototype to production:
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">
<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">
<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">
<br /><strong>Clients</strong>
</a>
<br />Connect to any MCP server — local or remote, programmatic or CLI.
</td>
</tr>
</table>
Servers wrap your Python functions into MCP-compliant tools, resources, and prompts. Clients connect to any server with full protocol support. And Apps give your tools interactive UIs rendered directly in the conversation.
Ready to build? Start with the installation guide or jump straight to the quickstart.
Run FastMCP in production with Horizon
FastMCP is the standard way to build MCP servers. Prefect Horizon 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 →
Installation
We recommend installing FastMCP with uv:
uv pip install fastmcp
For full installation instructions, including verification and upgrading, see the Installation Guide.
Upgrading? We have guides for:
- Upgrading from FastMCP v2
- Upgrading from the MCP Python SDK
- Upgrading from the 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 for why this happens (uv is unaffected).
📚 Documentation
FastMCP's complete documentation is available at gofastmcp.com, including detailed guides, API references, and advanced patterns.
Documentation is also available in llms.txt format, which is a simple markdown standard that LLMs can consume easily:
- llms.txt is essentially a sitemap, listing all the pages in the documentation.
- llms-full.txt contains the entire documentation. Note this may exceed the context window of your LLM.
Community: Join our Discord server to connect with other FastMCP developers and share what you're building.
Contributing
We welcome contributions! See the Contributing Guide for setup instructions, testing requirements, and PR guidelines.
Sign in to leave a review
Use Google, GitHub, or an email account so ratings stay tied to real people.
No reviews posted yet.
