v4.22.9
punkpeye/fastmcpv4.22.9Oct 14, 2026by github-actions[bot]
Upgrading?
AI Summary
Improves CLI robustness by validating arguments and rejecting unknown commands/options, alongside better session ping management.
Key Highlights
- Accepts --name=value arguments and ignores transport/stateless values.
- Rejects unknown CLI commands and options instead of ignoring them.
- Stops pinging sessions once the client hangs up, including during setup.
Full Release Notes
## [4.22.9](https://github.com/punkpeye/fastmcp/compare/v4.22.8...v4.22.9) (2026-10-14) ### Bug Fixes * accept --name=value arguments and reject transport or stateless values that would be ignored ([593b219](https://github.com/punkpeye/fastmcp/commit/593b21950fbeed2b32201589b8ed839a291d2102)) * **cli:** reject unknown commands and options instead of ignoring them ([78a029a](https://github.com/punkpeye/fastmcp/commit/78a029a61d058826a38d25c8d5280752e9e2848a)) * stop pinging a session once its client hangs up, including during setup ([f5b9beb](https://github.com/punkpeye/fastmcp/commit/f5b9beb95d6dcc8ccf1ea934200782cab09678d4))
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