Worked on strengthening WebSocket authentication and error handling for the SpacetimeDB core and its TypeScript SDK, focusing on robust token validation and improved connection reliability. Addressed issues where invalid authentication tokens could cause unclear failures by ensuring that both repositories now gracefully handle and signal connection errors. Enhanced error propagation and observability by adding explicit error messages and comprehensive tests, supporting faster debugging and safer live-connection behavior. Utilized TypeScript and JavaScript to align error signaling and test coverage across both codebases, resulting in more reliable API integration and a better developer experience when working with live WebSocket connections in production environments.