Worked on promptfoo/promptfoo and anthropics/claude-code-action, delivering targeted improvements in runtime flexibility and workflow reliability. Developed dynamic runtime file loading in promptfoo/promptfoo, enabling JavaScript and Python files to be loaded at runtime through file:// references in the vars context, which reduced manual script integration and supported modular prompt extension. In anthropics/claude-code-action, addressed branch management by updating validation logic to allow '+' characters in EnterWorktree-generated branch names, aligning with Git conventions and preventing workflow failures. Employed Node.js and TypeScript, focusing on precise, low-risk changes and thorough testing to enhance cross-team compatibility and maintain secure development practices.