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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 v2.1.4 10 Jan 2026

OAuth 401 Automatic Retry

Improved authentication reliability by automatically refreshing OAuth tokens when a 401 Unauthorized response is received from the API.

Details

When an API request fails with 401, the system now automatically refreshes the access token and retries the request
Reduces authentication failures during long sessions where tokens may expire
Telemetry event tengu_grove_oauth_401_received tracks when this occurs

Evidence

GY1() at line 317361 (OAuth retry wrapper, emits "tengu_grove_oauth_401_received" telemetry)

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

See this entry in the whole of v2.1.4 →