Claude Code's OAuth API Key Issue: What Happened and How to Prepare for Next Time

Claude Code's recent OAuth API key expiration incident highlights the importance of monitoring service status and having fallback workflows. What Happened On April 6, 2026, Claude Code users began reporting widespread authentication failures. The core issue: OAuth API keys were expiring daily instead of maintaining their expected validity period. Users encountered 500 errors and timeouts when trying to reauthorize, effectively locking them out of their coding workflows. Initially, the official Claude status page showed no indication of problems, which amplified frustration.