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v4.22.2

biomejs/biomev4.22.2Oct 4, 2026by github-actions[bot]

Upgrading?

What changed from v8.0.0 → v4.22.2?What's new in v4.22.3 after v4.22.2?

AI Summary

fastmcp v4.22.2 includes multiple edge case fixes, including handling unsupported MCP protocol versions and ensuring throwing tools return error results correctly.

Key Highlights

  • Fix for unsupported MCP-Protocol-Version headers
  • Fix for error handling in throwing tools

New Features

  • Answer 400 for unsupported MCP-Protocol-Version header
  • Return throwing tool errors as isError results
  • Avoid secondary parameter name collisions
  • Preserve empty property names in JSON Schema issue paths

Full Release Notes

## [4.22.2](https://github.com/punkpeye/fastmcp/compare/v4.22.1...v4.22.2) (2026-10-04)


### Bug Fixes

* **edge:** answer 400 for an unsupported MCP-Protocol-Version header ([#415](https://github.com/punkpeye/fastmcp/issues/415)) ([85a2b83](https://github.com/punkpeye/fastmcp/commit/85a2b83911cb09b232571cae952062cbcd94c2e9))
* **edge:** return a throwing tool's error as an isError result ([#410](https://github.com/punkpeye/fastmcp/issues/410)) ([5b7dfea](https://github.com/punkpeye/fastmcp/commit/5b7dfea7688588f85579a0f5ce917449bfaeb6f4))
* **openapi:** avoid secondary parameter name collisions ([#409](https://github.com/punkpeye/fastmcp/issues/409)) ([6670e7a](https://github.com/punkpeye/fastmcp/commit/6670e7abecdb0b1e39e5203e04ef08d9e0063146))
* preserve empty property names in JSON Schema issue paths ([#412](https://github.com/punkpeye/fastmcp/issues/412)) ([0c1cbe8](https://github.com/punkpeye/fastmcp/commit/0c1cbe85e02b64a2a34e8ce54a6ae80e9a73b58e))

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