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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 v2.1.76

PostCompact Hook Event

What

A new hook event that fires after conversation compaction completes, letting you run shell commands or prompts in response to compaction.

Details
  • Hook event name: PostCompact
  • Input includes compaction details and the summary text
  • Allows post-processing after compaction (e.g., logging, notification, or custom follow-up actions)
  • Hook output: exit code 0 shows stdout to user; other exit codes show stderr only
Evidence

PostCompact hook event definition (search for hook_event_name: C.literal("PostCompact"), "Running PostCompact hooks…")

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 v2.1.76 →