Under the hoodTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
TelemetryArea: what it touches
Internal ChangesKind: in v2.1.229,
What probably matters to youSection of the release
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.
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed auto mode failing on every tool call for users who disable the attribution header via CLAUDE_CODE_ATTRIBUTION_HEADER (direct Anthropic…
