During January 2025, contributed to the NixOS/nix repository by developing a targeted feature that enhances installation control within the package management workflow. Introduced a new --priority flag to the nix-env install command, enabling users to explicitly set installation priorities for pre-built store paths. This addition increases flexibility and determinism in managing installation order, addressing scenarios where precise control is required. The work involved command-line tool development and system administration, utilizing C++ and Shell scripting to integrate the feature seamlessly into existing workflows. No major bug fixes were addressed during this period, with efforts focused on delivering this specific functionality.