Andrew Lyu worked on hardening continuous integration for the modelcontextprotocol/ext-apps repository, focusing on improving test project provisioning. He implemented a CI environment variable-based installation process, allowing dynamic repository and branch references to be set during test runs. This approach, using JavaScript, YAML, and Git, reduced manual configuration and improved reproducibility across test environments. Andrew collaborated cross-team to deliver a fix that stabilized the installation flow, addressing a specific CI path issue and enhancing the reliability of automated testing. The work established a clearer, more maintainable baseline for scalable test automation, reflecting a thoughtful approach to CI/CD engineering challenges.