A single 401 on an Orca-account request no longer revokes the person's Claude account everywhere. The hook only fires after the real credential was swapped in and sent. The control plane then makes one free auth check with the real token (Anthropic count_tokens, oauth beta) and revokes only on a definite authentication_error; anything else (passes, 429, 5xx, other 401 types, network) keeps the account. Checks are rate-limited to one per person and agent per minute (agent_credentials.checked_at), and every keep/revoke is audited (agent_credential_audit, migration 0047). Codex keeps its lease-refresh path.