Common errors hit by AI agents.

When an agent loop fails, the first signal is usually an HTTP status from an upstream provider. This is the index — what the error means, why agents trigger it more often than humans, and how to fix it.

• Claude 529 — Overloaded

  Anthropic returned overloaded; what causes it in agent loops and how to back off correctly.

  Coming soon

• OpenAI 429 — Rate limit exceeded

  TPM vs RPM, why agents hit it faster, and the right retry strategy.

  Coming soon

• OpenAI 400 — Context length exceeded

  When tool histories blow past the model's context window.

  Coming soon

• MCP — Transport closed

  What it means when your MCP client loses the stream mid-call.

  Coming soon

• Anthropic 401 — Invalid API key

  Common causes, including key rotation drift and proxy header stripping.

  Coming soon