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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

Attribution header can override the environment opt-out

Under the hood
Useful3 Signal4
Telemetry Notable

One first-party request path sends the attribution header even if you opted out via env var.

CLAUDE_CODE_ATTRIBUTION_HEADER
What

The builder for the attribution header now takes an options argument, and one specific first-party, non-unix-socket path passes ignoreEnvOptOut, which makes the header be sent even when CLAUDE_CODE_ATTRIBUTION_HEADER is set to opt out.

Evidence

ignoreEnvOptOut

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 →