Developed two cross-repository features for the ADK platform, focusing on artifact management and session user experience. In the google/adk-python repository, introduced artifact state management for the SaveFilesAsArtifactsPlugin by implementing session-state deltas and new state and event-action handling, ensuring compatibility with the ADK Web UI. Enhanced the google/adk-web repository by enabling chat artifacts rendering during session resume, allowing relevant files to display alongside chat messages. Employed Angular, TypeScript, and asynchronous programming to integrate Python backend plugins with front-end components. Comprehensive unit testing validated new state handling and rendering flows, improving reliability and cross-team integration without introducing new bugs.