v4.20.17 v4.20.18

Name: fastmcp
Author: punkpeye

punkpeye/fastmcpSep 24, 2026 → Sep 25, 20261 day between releases

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Analyzing what changed between v4.20.17 and v4.20.18. This page updates automatically — usually within a minute.

The Two Releases

v4.20.17

Sep 24, 2026· 28 days ago

This release focuses on bug fixes, including correcting error responses for missing prompt arguments, fixing CLI validation path handling, and ensuring tool visibility for unauthenticated sessions. It also improves OpenAPI schema generation by preserving types for non-nullable fields.

Full release notes

v4.20.18

Sep 25, 2026· 27 days ago

Addresses a specific bug in OpenAPI schema conversion where boolean exclusive bounds from OpenAPI 3.0 were incorrectly transformed into JSON Schema numbers.

Full release notes