Worked on stabilizing agent state management for the CopilotKit/CopilotKit repository, focusing on improving data integrity and reliability during thread changes. Addressed a core issue by optimizing the agent state reset logic to trigger only on actual thread switches, which reduced unnecessary data replay and eliminated duplicate messages. Introduced a mechanism to track the last connected thread, ensuring that resets occurred only when genuine thread changes happened rather than during effect churn. Enhanced the solution with comprehensive tests to validate behavior across multiple scenarios. Utilized TypeScript and applied skills in debugging, state management, and testing to deliver a robust fix.