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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 v2.1.234

Event attributes are checked against the event kind

Under the hood
Useful1 Signal2
Poll Events

Event markers now reject attributes that don't belong to that particular event kind.

What

Parsing and writing of <event> markers now rejects attributes that are valid in general but not valid for that particular kind of event, instead of accepting them.

Evidence

invalid poll event attribute

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 v2.1.234 →