Developed and delivered the App State Reset via URL Query Parameter feature for the jupyterlab/jupyterlab repository, enabling users to reset application state on load through a URL query, with robust support for hash fragments. The implementation involved TypeScript and JavaScript frontend patterns, precise URL query parsing, and comprehensive test-driven development. Addressed an edge case where the reset parameter is followed by a hash fragment, ensuring consistent behavior across various URL patterns. Expanded unit and integration tests to cover the new flow, enhancing regression safety. This work improved workspace reproducibility and streamlined onboarding by reducing manual steps for state resets.