During June 2025, Jean-Philippe Poirier focused on enhancing the reliability of Agda’s type-checking pipeline in the agda/agda repository. He addressed a nuanced bug in the fitsIn function, refining how polarity annotations are handled when the --without-K option is enabled. By ensuring that polarity checks are bypassed in specific scenarios, he reduced the risk of incorrect type judgments in edge cases. His work included adding regression tests to verify the combined behavior of the --polarity and --without-K flags. Leveraging Haskell and his expertise in compiler development and type checking, Jean-Philippe improved both test coverage and future maintainability.