v4.21.2
maurosoria/dirsearchv4.21.2Sep 25, 2026by github-actions[bot]
Upgrading?
AI Summary
A bug fix release for FastMCP addressing errors when prompts or resources are unknown and improving authentication visibility.
Key Highlights
- Answered error code -32602 for unknown prompt or resource templates.
- Kept record value schemas in advertised tool inputs.
- Hidden tools from sessions that failed authentication.
- Preserved free-form object arguments in tool inputs.
Full Release Notes
## [4.21.2](https://github.com/punkpeye/fastmcp/compare/v4.21.1...v4.21.2) (2026-09-25) ### Bug Fixes * answer -32602 when completion/complete names an unknown prompt or resource template ([f05b026](https://github.com/punkpeye/fastmcp/commit/f05b026e20ddb60703066f879d8a0d7ee3d0c18a)) * **edge:** keep record value schemas in advertised tool inputs ([d214e31](https://github.com/punkpeye/fastmcp/commit/d214e313b268fc103cc730d1edd385e5998647d0)) * hide canAccess tools from sessions that failed to authenticate ([28cdac4](https://github.com/punkpeye/fastmcp/commit/28cdac4b90c6bd9718a33b27030eb57445266fc8)) * keep free-form object arguments open in advertised tool inputs ([4a3b84d](https://github.com/punkpeye/fastmcp/commit/4a3b84d658736b5982be96e3e5f61349e77ca635))
Related Repositories
public-apis/public-apis★ 491,135
A collective list of free APIs
NousResearch/hermes-agent★ 255,963
The agent that grows with you
yt-dlp/yt-dlp★ 200,054
A feature-rich command-line audio/video downloader
microsoft/markitdown★ 191,491
Python tool for converting files and office documents to Markdown.
Significant-Gravitas/AutoGPT★ 187,703
AutoGPT is the vision of accessible AI for everyone, to use and to build on. Our mission is to provide the tools, so that you can focus on what matters.