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fastmcp
AI Coding Tools
A Python framework that simplifies building Model Context Protocol (MCP) servers, clients, and interactive apps
Python
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Latest v3.4.0 · 23h ago
Security brief →
Features
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Auto‑generates MCP tool schemas, validation, and documentation from plain Python functions
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Provides built‑in server components to expose tools, resources, and prompts to LLMs
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Offers client libraries for seamless connection to any MCP server (local or remote)
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Enables interactive UI “Apps” rendered directly in conversation flows
Review required
v3.4.0
Breaking risk
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Auth
Breaking upgrade
fastmcp-remote + proxy failure handling + auth token lifespan
No immediate action
v3.3.1
Bug fix
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Component import decoupling
Review required
v3.3.0
Mixed
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Auth
fastmcp-slim + OAuth proxy hardening
v3.2.4
Breaking risk
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Breaking changes
- Background tasks now scoped to authorization context instead of MCP session
Security fixes
- FileUpload validates actual decoded base64 size instead of trusting client-reported size
- Fixed HTTP header forwarding to unrelated remote servers
- AuthKit auto-binds token audience to resource URL (RFC 8707)
Notable features
- Keycloak OAuth provider for enterprise authentication
- Parameter descriptions automatically extracted from docstrings
- Added response_title and response_description to ctx.elicit()
v2.14.7
Bug fix
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## What's Changed
### Fixes 🐞
* fix(deps): cap fakeredis to <2.35.0 to prevent startup crash on 2.x
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