Worked on enhancing the resilience of the openclaw/openclaw backend by implementing a robust failover mechanism for large language model (LLM) provider integrations. Focused on classifying HTTP 503 and other transient errors, the solution enables automatic provider failover during periods of high demand or service unavailability. The approach included handling errors wrapped by SDKs without numeric prefixes, ensuring that failover triggers correctly in diverse scenarios. Developed primarily in TypeScript, the work leveraged API integration and advanced error handling techniques to reduce request latency and service degradation, laying the foundation for future profile rotation and model fallback capabilities within the system.