Every Anthropic error we see across thousands of AI agents routing through the gateway. 2 common errors, 56 affected teams in the last 30 days. Each one with what it means, how to fix it, and how the gateway routes around it.

Anthropic errors skew toward 429 rate limits and 529 overloaded_error during peak hours, plus 400s when a long transcript overflows a model's context window. Trim history on long agent loops, honor Retry-After, and keep a fallback model for capacity spikes.