Error Handling & Retries

Handle Claude API errors well. Learn the error taxonomy (400 invalid_request, 401 authentication, 403 permission, 404 not_found, 413 request_too_large, 429 rate_limit, 500 api, 529 overloaded), idempotent retries, exponential backoff with jitter, the Retry-After header, the circuit-breaker pattern, and the difference between transient and permanent failures in production traffic.