QianCyrus focused on backend reliability improvements for the agentscope-ai/agentscope repository, addressing a critical issue in the plan lifecycle. They resolved a bug where plan change hooks were not triggered during historical plan recovery, ensuring that state changes are now consistently signaled and downstream processes receive accurate notifications. Their approach involved both Python development and comprehensive automated testing, adding coverage to verify that hooks are correctly invoked after restoring historical plans. This work enhanced the robustness of plan state management, reducing the risk of missed triggers. QianCyrus demonstrated depth in backend development and testing, prioritizing reliability and maintainability in their solution.