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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 v2.1.238

Hook callbacks remember which host created them

Under the hood
Useful2 Signal3
Hooks

Hook callbacks tied to a replaced SDK host now answer from a stored result instead of hanging.

What

Each hook callback records which generation of the SDK host it belongs to. If that host has since been replaced and a retirement answer is on file, the callback answers from that instead of sending a request to a host that is no longer listening.

Evidence

retiredHostHookAnswer

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 v2.1.238 →