During March 2026, Dirane Yy focused on enhancing build determinism in the swiftlang/swift-build repository by improving the reliability of build manifests for projects using .xcstrings. He implemented a feature in Swift that sorts generated file paths in xcstringstool dry runs, ensuring reproducible BuildDescription hashes and enabling more effective caching and predictable CI outcomes. The work involved refactoring the sorting logic into a shared path within CommandLineToolSpec, so all related command line tools benefit. Dirane also added comprehensive tests to verify sorting correctness and collaborated on test fixes, demonstrating depth in build system development, command line tooling, and testing.