FastMCP is a Pythonic library that helps developers build Model Context Protocol (MCP) servers and clients by wrapping standard Python functions into MCP-compliant tools, resources, and prompts. It automates schema generation, validation, and protocol lifecycle management to reduce boilerplate.
Project overview
It reduces the boilerplate and complexity of MCP application development by automatically generating schemas and managing the protocol lifecycle directly from Python functions.
Project type
MCP
Use cases
Automation
Deployment
Refer to project documentation
License
Apache-2.0
Best for
Developers who need a Python library to expose functions to LLMs via the Model Context Protocol.
Users looking to automate schema generation and manage protocol lifecycles without manual boilerplate.
Key capabilities
Wraps Python functions into MCP-compliant tools, resources, and prompts to expose to LLMs.
Generates schema, validation, and documentation automatically from Python functions.
Limitations and risks
Adopting this framework requires the ability to write Python code.
GPU requirements, minimum hardware, database dependencies, external services, operating system compatibility, model requirements, telemetry, and cost dependencies are not documented.
Local execution of this library is documented, but data boundary characteristics, including the presence or absence of external inference calls or cloud round-trips, are not documented.
Getting started
Install the library easily via pip or uv using the command 'uv pip install fastmcp'.
Evidence and sources
GitHub project description: 🚀 The fast, Pythonic way to build MCP servers and clients.
README: 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…
README: 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 F…
README: We recommend installing FastMCP with [uv](https://docs.astral.sh/uv/): ```bash uv pip install fastmcp ```
README: from fastmcp import FastMCP mcp = FastMCP("Demo 🚀") @mcp.tool def add(a: int, b: int) -> int: """Add two numbers""" return a + b