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.
API error reports note what kind of credential setup you use, without recording the credential.
What's wrong with this entry?
Anonymous. No account, no email.
What
API error telemetry now records whether a custom base URL, an auth token or an API key helper is in use, plus a coarse classification of the API key prefix, so failures can be attributed to a configuration shape rather than an individual credential.
Details
Server responses are mapped onto a fixed set of error type and code values, with anything unlisted reported as "other".
Evidence
sk_ant_api03
Strings lifted out of the shipped bundle, so the claim above can be checked against them.