During December 2025, M. Mhat developed robust Git object format support for the Buck2 and Buck2 Prelude repositories, focusing on enhancing reliability and correctness in build workflows. Leveraging Bazel, Python, and Rust, Mhat introduced an optional object_format attribute to the git_fetch rule, enabling explicit selection between sha1 and sha256 formats. The implementation included strict validation of commit hashes and integration with .buckconfig for external cell configuration, ensuring compatibility with existing repositories. By expanding test coverage and validating object-format flows across multiple repositories, Mhat’s work improved reproducibility and reduced CI failure rates, demonstrating depth in build system development and configuration management.