During May 2025, Chia-Chi Chiou focused on backend development and error handling within the jenkinsci/jenkins repository, addressing reliability in distributed agent communication. He delivered a targeted bug fix in Java, implementing explicit handling for ConnectionRefusalException in WebSocketAgents. This approach logs connection refusals and returns a 400 HTTP error to clients, preventing silent failures and improving system observability. By surfacing connection issues directly, Chia-Chi enhanced user feedback and reduced unnecessary retry attempts. The work demonstrated a thoughtful approach to agent lifecycle management, reinforcing the robustness of WebSocket-based agent connections and aligning with ongoing efforts to harden Jenkins’ distributed infrastructure.