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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.

All of v2.1.64 Home All releases olderv2.1.63 v2.1.66newer
Claude Code v2.1.64

asyncRewake Hook Option

What

A new hook configuration option that allows hooks to run in the background and wake the model when they encounter a blocking error (exit code 2).

Details
  • When asyncRewake: true, the hook runs asynchronously like async: true
  • If the hook exits with code 2, it signals a blocking error that wakes the model
  • The blocking error message from the hook command is surfaced to the user
  • New "Stop hook blocking error" notification type when this occurs
Evidence

Async rewake hooks (search for "asyncRewake", "If true, hook runs in background and wakes the model on exit code 2")

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

See this entry in the whole of v2.1.64 →