Worked on the openclaw/openclaw repository to address critical backend issues affecting automated conversation workflows. Focused on stabilizing the sessions-spawn tool by removing a restrictive maxLength constraint from attachment content, which resolved grammar overflow errors and enabled compatibility with llama.cpp GBNF grammar for processing large attachments. Improved the reliability of the auto-reply timeline by restoring system event displays and refining prompt parsing to prevent event shadowing, resulting in more consistent cache behavior. Utilized JavaScript and TypeScript for backend development, schema definition, and testing, with an emphasis on refactoring to reduce error-prone state mutations and enhance end-user experience.