🚀FastMCP
PrefectHQ/fastmcp · homepage ↗
🚀 The fast, Pythonic way to build MCP servers and clients.
⭐ Very popular: 27k stars, gaining about 159 a week
View on GitHub ↗repo profile
momentum
durability
bus factor = how many people it takes to cover more than half the commits (6 months). 1 is a solo project; higher means the work is spread across a team. top-author share is the single busiest author's slice of those commits.
since we covered it
why it's a big deal
- FastMCP gives Python developers a standard way to expose tools, resources, and prompts to LLMs, and to build clients that connect to any MCP server, local or remote.
- It reduces the boilerplate of MCP work by generating schema, validation, and documentation directly from Python function signatures.
- The project reports being downloaded a million times daily and powering roughly 70 percent of MCP servers across all languages, so it is a common dependency for teams shipping MCP integrations.
under the hood
- Written entirely in Python, it wraps ordinary functions as MCP tools using decorators such as @mcp.tool, with schema and validation inferred from the function signature.
- It covers the three MCP components of servers, clients, and apps, and handles transport negotiation and protocol lifecycle so developers do not manage the wire protocol directly.
- FastMCP 1.0 was folded into the official MCP Python SDK in 2024, while this repository is the separately maintained standalone project installed via uv pip install fastmcp.
Radar summary, generated from the project's public sources
star history
- PR#7 8k 2025-04-30
- now 27k + 19k since first covered
curve is sampled from GitHub's star history, plus our own daily readings since we covered it; the dashed stretch is before we first covered it, the solid line since. figures at coverage are the numbers we printed then (approx.), current count is live.
understory
Quietly building: more output than attention, for now.
- output, commits & releases
- clout, star velocity
output = commits & releases; clout = star velocity, both 0 to 100 monthly indices; the gap where output runs above clout is the understory. The understory →
covered in
-
The Fast, Pythonic Way to Build MCP Servers and Clients
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