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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.219

Slash-command hook results can carry a system message

Use it now
Useful3 Signal0
Hooks Notable

Hooks on slash commands can now show you a system message, not just output and pass/fail.

systemMessage
What

A hook attached to slash-command execution can now surface a system-level note to the user rather than only output and a pass/fail signal.

Details
  • The command execution result propagates systemMessage from the hook's output alongside the existing output, succeeded and blocked.
Evidence

systemMessage

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.219 →