FastMCP: The Pythonic Framework for Model Context Protocol Applications
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Summary
FastMCP is a robust, Pythonic framework developed by PrefectHQ, designed to simplify the creation of Model Context Protocol (MCP) servers and clients. It provides a comprehensive application framework for connecting Large Language Models (LLMs) to tools and data, handling complexities like schema generation, validation, and protocol lifecycle. As the standard framework for MCP, FastMCP empowers developers to build powerful LLM-integrated applications efficiently.
Repository Information
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Introduction
FastMCP, developed by PrefectHQ, is a powerful and Pythonic framework for building applications that leverage the Model Context Protocol (MCP). MCP is essential for connecting Large Language Models (LLMs) with external tools and data, enabling them to perform complex tasks. FastMCP simplifies this process, providing a full application framework for servers, clients, and interactive applications, making it the de facto standard for MCP development.
Installation
Getting started with FastMCP is straightforward. You can add it to your project using uv:
uv add fastmcp
For complete installation instructions, including verification and upgrading, refer to the official Installation Guide.
Examples
FastMCP allows you to declare tools using ordinary Python functions. Here's a simple example of an MCP server:
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()
This code snippet demonstrates how easily you can define a tool, with schema, validation, and documentation generated automatically.
Why Use FastMCP
Building effective MCP applications can be challenging, but FastMCP abstracts away much of the complexity. It automatically handles schema generation, validation, and documentation for your tools, and manages transport negotiation, authentication, and protocol lifecycle for clients. This allows developers to focus on core logic, ensuring that best practices are built in from the start.
FastMCP is structured around three core pillars:
- Servers: Expose Python functions as MCP-compliant tools, resources, and prompts to LLMs. (Learn more about Servers)
- Clients: Connect to any MCP server, local or remote, with full protocol support. (Learn more about Clients)
- Apps: Provide interactive user interfaces for your tools, rendered directly within conversations. (Learn more about Apps)
For TypeScript developers, FastMCP for TypeScript offers the same powerful features and concepts.
Links
Explore FastMCP further with these resources:
Source repository
Open the original repository on GitHub.