Developed a type-safe session management feature for the Chainlit/chainlit repository, focusing on enhancing backend reliability and developer productivity. Leveraging Python and advanced type hinting, the work introduced a SessionAccessor class that enables type-aware get, set, and reset operations for user session data. The implementation supports default values and optional transformation functions for session keys, reducing runtime errors and streamlining onboarding for new contributors. By establishing a foundation for safer session handling, the changes improved the overall robustness of session management and set the stage for future enhancements. No major bugs were addressed during this period, emphasizing feature delivery.