All API requests to Anthropic's first-party service now include an x-client-request-id header. When API errors occur, the request ID is surfaced in the error message ("give this to the API team for server-log lookup"), making it easier to debug issues with Anthropic support.
Evidence
Request ID tracking (search for "x-client-request-id", "API error x-client-request-id=")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeAdded x-client-request-id header to API requests for debugging timeouts
