Fault Tolerance in LangGraph: Retries, Timeouts, and Error Handlers

LangGraph provides three built-in fault tolerance primitives for production agents: RetryPolicy for automatic retries with backoff, TimeoutPolicy for preventing hung operations, and error_handler for cleanup logic after retries fail. These mechanisms compose naturally to support complex workflows like flight booking that involve multiple external systems and require partial rollback capabilities when individual steps fail. The guide demonstrates how combining these primitives enables teams to build reliable agent workflows that gracefully handle real-world failures.