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When an OAuth invalid_grant error is encountered, Claude Code now proactively clears the stale refresh token from both the file-based and config-based credential stores, rather than leaving it to fail on every subsequent request. This should reduce repeated auth failures after token expiration.
Evidence
New invalid_grant detection and token clearing (search for "invalid_grant", "tengu_oauth_refresh_token_cleared_invalid_grant", "tengu_wif_user_oauth_refresh_token_cleared")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.