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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

Only four hook types produce non-user content

You'll notice
Useful3 Signal0
Hooks

Only Stop, TeammateIdle, TaskCreated and TaskCompleted hooks are treated as internal; other hook feedback reads as your text.

StopTeammateIdleTaskCreatedTaskCompleted
What

Hook feedback is no longer detected purely by the trailing marker on the first line; the hook name must be one of an explicit allowlist for the message to be treated as internal rather than user text.

Details
  • Allowlist is Stop, TeammateIdle, TaskCreated and TaskCompleted.
  • Each name is checked as a prefix against the same hook feedback: marker.
  • Feedback from any other hook now falls through and is treated as ordinary user content.
Evidence

sry = ["Stop", "TeammateIdle", "TaskCreated", "TaskCompleted"]

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.223 →