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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 v2.1.229

Injected stream-json user messages no longer count as human turns

You'll notice
Useful2 Signal3
Stream JSON

Programmatically injected messages are no longer counted as coming from a real person.

What

Messages pushed into a session programmatically are now marked and skipped by both the content transform and the check that stamps a turn as coming from a verified human relay, so an injected line cannot be attributed to a person. The injected line is also no longer given a trailing newline before it is parsed.

Evidence

verifiedSlackHumanTurn

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 v2.1.229 →