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Released September 24, 20261 fixGitHub releaseCompare changes

Fixes

  • agent a describe’s subject no longer becomes a tool call, and an empty argv never panics a plugin #1649 · 3359789

Newer release: v1.210.2

the required block is a plan, not the model’s reasoning; both spellings are read

Previous release: v1.210.0

Opus 5.5 and the September model launches, self-healing Claude Code fingerprint, refusals name their category