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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

Auto-mode side queries always send the billing attribution header

Under the hood
Useful3 Signal4
Telemetry Notable

Auto-mode's side queries send billing attribution metadata even if you set the opt-out variable.

CLAUDE_CODE_ATTRIBUTION_HEADER
What

The auto-mode classifier, the two-stage classifier and the critique query now force the billing attribution system block to be sent even when the opt-out environment variable is set. It carries version, entrypoint and workload metadata, not conversation content, and is only sent on the first-party API and never over a unix socket.

Evidence

forceAttributionHeader

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 →