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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 v2.1.248

The hook validation warning carries the reason

You'll notice
Useful3 Signal1
Hooks

Hook validation warnings now tell you why the JSON failed instead of a fixed phrase.

What

The local "hook JSON output failed validation" warning is now assembled at runtime from the diagnostic helper, so hook authors see why it failed; the old fixed phrase remains only as a fallback.

Evidence

hook JSON output failed validation

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 v2.1.248 →