v4.21.2 v4.21.1

Name: fastmcp
Author: punkpeye

punkpeye/fastmcpSep 25, 2026 → Sep 25, 20260 days between releases

Generating AI comparison

Analyzing what changed between v4.21.2 and v4.21.1. This page updates automatically — usually within a minute.

The Two Releases

v4.21.2

Sep 25, 2026· 27 days ago

Focuses on refining tool input schemas and error handling. It fixes errors for unknown resources, ensures free-form arguments are handled correctly, and improves security by hiding unauthorized tools.

Full release notes

v4.21.1

Sep 25, 2026· 27 days ago

A maintenance release addressing various bugs, including incorrect error codes for unknown prompts, hanging validation commands, and type-checking issues. It ensures proper access control for authenticated stdio sessions.

Full release notes