FastMCP — MCP protocol

A high-level framework for quickly building MCP servers in Python

Basic information

What is this program?

FastMCP is a framework that provides a more concise high-level API than the official SDK when building MCP servers in Python. It defines tools with decorators and handles requests and responses with context objects.

It follows familiar patterns like FastAPI and includes built-in validation, serialization, and error handling, which greatly reduces server code.

What problems does it solve?

• ('For fast server building', 'when you need to create an MCP server with minimal code', 'provides high-level abstraction')
• ('For reusing FastAPI experience', 'when you need to implement MCP with familiar Python patterns', 'offers a similar development experience')

Key features

High-level tool API

Define tools concisely with decorators

• When to use: increased productivity
• What you get: significantly less code
• Limitations: fine-grained control requires the official SDK

Context API

Manage requests, responses, and progress through context

• When to use: rich server logic
• What you get: state management
• Limitations: requires understanding the context lifecycle

Installation and execution

pip

Install it with pip.

pip install fastmcp

Real-world usage example

Writing a server

Define tools with the @mcp.tool() decorator.

@mcp.tool
def add(a:int,b:int)->int:
    return a+b

Advantages and limitations

Advantages

• Concise high-level API
• FastAPI-like patterns
• Built-in validation and error handling

Points to consider before use

• Limited fine-grained control compared to the official SDK
• Community framework

Comparison with similar programs

Official resources and further learning

• Official homepage — https://gofastmcp.com/
• Official documentation / knowledge base — https://gofastmcp.com/
• Installation and deployment — pip install fastmcp
• Release notes — https://pypi.org/project/fastmcp/#history
• Source / development resources — https://github.com/jlowin/fastmcp

Version and supported environment information was confirmed on the official site as of 2026-10-18. Installation commands may vary depending on your distribution and version, so check the official installation documentation as well.

Actual execution screen

Synthetic example — not an actual execution result. The screen is a synthetic example and not an actual execution result.

!FastMCP usage example

Actual server in operation

Source (HTML): https://games.aidebatehub.com/programs/mcp/protocol/fastmcp.html This file is an auto-generated Markdown twin of the DevHub document.