Devtoolwatch BoardFastMCP review
FastMCP is a Python framework for building Model Context Protocol servers, clients, and interactive apps that connect LLMs to tools and data.
TL;DR
FastMCP is a Python framework for building MCP servers, clients, and interactive apps. It is for Python developers who want to expose functions as MCP tools without writing schemas and protocol handling by hand. FastMCP generates schemas and validation from Python functions and manages transport, authentication, and protocol lifecycle.
- 28.3kGitHub stars
- +70new stars, week of Oct 25
- 13.1Mdownloads a week, −5% vs 4-week avg
- #55in MCP and agent tools this week
FastMCP at a glance
- Category
- MCP and agent tools
- Maintained by
- Prefect (organization, @PrefectHQ on GitHub)
- License
- Apache 2.0
- Language
- Python, JavaScript, CSS
- Repository
- github.com/PrefectHQ/fastmcp
- Website
- gofastmcp.com
- PyPI package
- fastmcp 4.1.3
- Latest release
- v3.4.11 on GitHub, Oct 20, 2026
- First published
- Nov 30, 2024
What FastMCP does
- FastMCP turns Python functions into MCP tools, with schema, validation, and documentation generated automatically.
- FastMCP servers expose Python functions, data, and instructions as MCP tools, resources, and prompts.
- FastMCP clients connect to local or remote MCP servers through Python, the command line, or another MCP application.
- FastMCP Apps let tools return forms, tables, charts, and other interactive interfaces rendered directly in the conversation.
- FastMCP handles transport negotiation, authentication, and connection lifecycle when a client connects to a server URL.
- FastMCP supports component authorization and OAuth client credentials providers with issuer binding.
How it works
You write ordinary Python: create a FastMCP instance, decorate functions with @mcp.tool, and call mcp.run(). FastMCP derives schemas from the functions, validates inputs and outputs, and exposes them through MCP. Clients connect to local or remote MCP servers by URL. FastMCP 4 is built for the new MCP protocol and uses system trust stores by default.
How to install and start using FastMCP
With uv
uv add fastmcpRequirements
- Python 3.10 or later
- FastMCP 3.4.11 requires certifi 2026.10.19 or later
First steps
- Add FastMCP to your project with uv, as the README recommends.
- Create a server with mcp = FastMCP("Demo 🚀") and decorate a Python function with @mcp.tool.
- Call mcp.run() under if __name__ == "__main__" to start the server.
- Give your coding agent https://gofastmcp.com/llms.txt as its starting point for the documentation.
Who FastMCP is for
- Python developers exposing existing functions as MCP tools, resources, or prompts for LLMs
- Developers writing programmatic clients that connect to local or remote MCP servers
- Teams that want tools to return interactive UIs such as forms, tables, or charts in the conversation
Limitations to know
- FastMCP is a Python library; TypeScript developers need the separate FastMCP for TypeScript package.
- After the October 2026 CA incident, upgrading FastMCP alone is insufficient; system, container, custom, and installer trust stores also need updates.
- Users of ClientCredentialsOAuthProvider or PrivateKeyJWTOAuthProvider must set issuer to enable issuer-binding protection in 4.1.2.
- FastMCP covers the application layer; team-wide governance, SSO, and audit logs are offered through Prefect Horizon instead.
Is FastMCP growing? Usage data
In the week of Oct 25–31, 2026, FastMCP ranked #369 on the Devtoolwatch Board and #55 in MCP and agent tools, with a momentum score of 14 out of 100. Its main package had 13.1M downloads that week, −5% against its own 4-week average.
Show the weekly numbers
| Week of | New stars |
|---|---|
| Aug 9, 2026 | 114 |
| Aug 16, 2026 | 112 |
| Aug 23, 2026 | 111 |
| Aug 30, 2026 | 113 |
| Sep 6, 2026 | 117 |
| Sep 13, 2026 | 138 |
| Sep 20, 2026 | 146 |
| Sep 27, 2026 | 76 |
| Oct 4, 2026 | 84 |
| Oct 11, 2026 | 94 |
| Oct 18, 2026 | 94 |
| Oct 25, 2026 | 70 |
On Hacker News
- Welcome to FastMCP, 80 points and 68 comments (Mar 24, 2026)
The Board ranks tools by four signals each week: new stars, new stars for the repo's size, added downloads and download growth beyond the market. How the ranking works.
FastMCP alternatives
Other MCP servers and agent tools on the Board in the week of Oct 25–31, 2026, by momentum:
| Rank | Tool | Stars | Downloads/wk |
|---|---|---|---|
| #1 | REAREA is an MCP server and CLI that lets coding agents reverse engineer native binaries, JavaScript and Electron apps, .NET assemblies,… | 415.5k | 760.6k |
| #2 | ha-mcpha-mcp is an unofficial Model Context Protocol server that lets AI assistants control and manage Home Assistant using natural language. | 5.4k | 118.1k |
| #3 | TregTreg is a registry and proxy that gives AI agents one token for a catalog of paid third-party API endpoints and team-shared tools. | 6.9k | 6.7k |
| #4 | Chrome DevTools MCPChrome DevTools MCP is an MCP server and CLI that lets coding agents control and inspect a live Chrome browser using Chrome DevTools. | 54.6k | 2.7M |
| #5 | codebase-memory-mcpHigh-performance code intelligence MCP server. Indexes codebases into a persistent knowledge graph — average repo in milliseconds. 162… | 47.9k | – |
| #6 | open-computer-use👾 Open Computer Use – Open-Source Alternative to Codex Computer Use | 2.8k | – |
Recent FastMCP releases
FastMCP FAQ
Is FastMCP free and open source?
Yes. FastMCP's source code is on GitHub (PrefectHQ/fastmcp) under the Apache 2.0 license, so you can use it for free.
How do I install FastMCP?
Run uv add fastmcp. The fastmcp package needs Python 3.10 or newer. The install section above has the other options from the project's README.
Is FastMCP still maintained?
Yes. The PrefectHQ/fastmcp repository was last updated on Oct 21, 2026, and the latest release, v3.4.11 on GitHub, came out on Oct 20, 2026.
How popular is FastMCP?
FastMCP has 28.3k GitHub stars as of Nov 1, 2026. It gained 70 new stars in the week of Oct 25–31, 2026, against a 12-week average of 106 a week. Its main package had 13.1M downloads that week, −5% against its own 4-week average. That made it #55 among MCP servers and agent tools on the Devtoolwatch Board.
FastMCP vs MCP Python SDK: how do they compare?
FastMCP and MCP Python SDK are both tracked by Devtoolwatch as MCP servers and agent tools. FastMCP has 28.3k GitHub stars and MCP Python SDK has 24.7k. In the week of Oct 25–31, 2026, FastMCP's main package had 13.1M downloads and MCP Python SDK's had 71.1M. MCP Python SDK is the official Python library for building Model Context Protocol servers and clients. MCP Python SDK review.
FastMCP vs LangChain: how do they compare?
FastMCP and LangChain are both tracked by Devtoolwatch. FastMCP has 28.3k GitHub stars and LangChain has 148.8k. In the week of Oct 25–31, 2026, FastMCP's main package had 13.1M downloads and LangChain's had 41.1M. LangChain review.
What are the best alternatives to FastMCP?
Other MCP servers and agent tools on the Devtoolwatch Board in the week of Oct 25–31, 2026, by momentum: REA (#1), ha-mcp (#2), Treg (#3), Chrome DevTools MCP (#4), codebase-memory-mcp (#5). The alternatives table above has their numbers.
How is FastMCP related to the official MCP Python SDK?
FastMCP 1.0 was incorporated into the official MCP Python SDK in 2024. The standalone FastMCP project continues to be maintained separately and provides upgrade guides for users coming from MCP SDK v1 and v2.
How do I use FastMCP in Python?
FastMCP servers start with ordinary Python. Import FastMCP, create an instance, decorate a function with @mcp.tool, and call mcp.run(). FastMCP generates the tool's schema and validation from the function signature and docstring.
Can FastMCP serve prompts as well as tools?
Yes. FastMCP servers expose tools, resources, and prompts to LLMs, wrapping Python functions into MCP-compliant components.
Is there a TypeScript version of FastMCP?
Yes. FastMCP for TypeScript is the official counterpart, built by the same team at Prefect, with the same pillars. It installs with npm install @prefecthq/fastmcp-ts.
Is FastMCP safe to use?
FastMCP releases include regular security fixes, such as authorization of transformed components, bounded regex tool search, and OpenAPI path checks. The 3.x line receives backported fixes. After the October 2026 CA compromise, users must also update trust stores.
Sources
FastMCP README badge
Maintainers can show the tool's weekly Board rank in their README:
[](https://index.devtoolwatch.com/tools/fastmcp/)How this page is made: Devtoolwatch writes each review from the project's README, releases, package metadata and website, with an AI model, then checks every claim against the source it cites and drops what the sources don't support. The numbers come from Devtoolwatch's daily GitHub snapshots, GitHub's stargazer history, and the npm and PyPI download APIs. Spotted an error? Email [email protected].