v4.20.15

Name: bolt.diy
Author: stackblitz-labs

stackblitz-labs/bolt.diyv4.20.15Sep 21, 2026by github-actions[bot]

Upgrading?

What changed from v3.3.5-rc1 → v4.20.15?What's new in v4.20.16 after v4.20.15?

AI Summary

This release improves server stability and API compatibility by handling edge cases in tool calls, logging errors gracefully, and fixing OpenAPI schema parsing for empty properties.

Key Highlights

Catch failed log notifications instead of crashing the server
Accept tool calls that omit params.arguments
Fix OpenAPI to preserve JSON dictionary bodies with empty properties

Full Release Notes

## [4.20.15](https://github.com/punkpeye/fastmcp/compare/v4.20.14...v4.20.15) (2026-09-21)


### Bug Fixes

* accept a tools/call that omits params.arguments ([#383](https://github.com/punkpeye/fastmcp/issues/383)) ([e7e4520](https://github.com/punkpeye/fastmcp/commit/e7e45208d339101d8cf0eb39323fb3de56dbd960))
* catch failed log notifications instead of crashing the server ([#382](https://github.com/punkpeye/fastmcp/issues/382)) ([c15e194](https://github.com/punkpeye/fastmcp/commit/c15e194eab508e798cc43ca4e8c8cb66d3c29445))
* **openapi:** preserve JSON dictionary bodies with empty properties ([#381](https://github.com/punkpeye/fastmcp/issues/381)) ([d9edf6c](https://github.com/punkpeye/fastmcp/commit/d9edf6cb5befd49e65723b860fb5418cfb0c3c06))

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