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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 v2.1.223

Hook-feedback meta messages identified by hook name instead of a line suffix

Under the hood
Useful2 Signal0
Elsewhere

Your own messages won't be mistaken for hook feedback just because they end with a marker.

What

Synthetic hook-feedback user messages are recognized more precisely, so ordinary messages that happen to end with the marker are no longer misclassified.

Details
  • Detection changed from "first line ends with the marker" to "starts with a known hook name followed by the marker".
  • Known hook names for this check: Stop, TeammateIdle, TaskCreated, TaskCompleted.
Evidence

TeammateIdle

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

See this entry in the whole of v2.1.223 →