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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

Two small-model calls force an attribution header

Under the hood
Useful2 Signal3
Telemetry

Two internal helper model calls now attach attribution metadata to their requests.

What

Two internal completion call sites now request that attribution metadata be attached to the request, alongside the existing option that skips the system prompt prefix.

Evidence

forceAttributionHeader: !0

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.229 →