Anthropic Reference Architecture Overview Three validated architecture patterns for Claude API integrations: synchronous API gateway, async queue-based processing, and multi-model routing. Architecture 1: Sync API Gateway (Simple) Architecture 2: Async Queue-Based (Scalable) Architecture 3: Multi-Model Router Project Layout Error Handling | Architecture | Failure Mode | Mitigation | |-------------|-------------|------------| | Sync Gateway | 429/5xx blocks user | Circuit breaker + fallback response | | Queue-Based | Worker crashes | Dead-letter queue + retry policy | | Multi-Model | Router mi…