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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.

All of v2.0.77 Home All releases olderv2.0.76 v2.1.0newer
Claude Code v2.0.77

OAuth 401 Error Recovery

What

OAuth authentication now attempts to recover from 401 errors by re-reading credentials from the system keychain.

Details
  • When a 401 error occurs, Claude Code checks if the keychain has newer credentials
  • If different credentials are found, they're used without requiring re-authentication
  • Reduces unnecessary login prompts when tokens are refreshed externally
  • Telemetry event: tengu_oauth_401_recovered_from_keychain
Evidence

C1B() at line 146443 (OAuth recovery, contains "tengu_oauth_401_recovered_from_keychain")

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

See this entry in the whole of v2.0.77 →