Andres contributed foundational scaffolding to the jasmin-lang/jasmin repository by enabling future Ztac integration within the language utilities. He introduced a minimal change in Coq, specifically importing the Ztac module into lang/utils.v, which established a clear and low-risk path for upcoming Ztac functionality. This preparatory step focused on formal verification, ensuring that the integration could proceed incrementally and with traceable changes. While the scope of work was intentionally limited to a single feature and did not involve bug fixes, Andres’s approach demonstrated careful planning and technical precision, laying the groundwork for more advanced formal verification enhancements in the project.