During January 2026, Oahcihsnauy focused on backend stability for the alibaba/nacos repository by addressing a critical bug in the gRPC Subscribe path. Using Java and gRPC, Oahcihsnauy implemented proactive input validation and robust error handling within the SubscribeServiceRequestHandler, ensuring that invalid subscribe requests now return HTTP 400 errors instead of 500. This change prevents unnecessary client retries and stabilizes SDK interactions, directly improving developer experience and service reliability. The work involved adding early parameter checks and refining exception handling, demonstrating a thoughtful approach to backend development and unit testing while enhancing the overall health of the service discovery platform.