During March 2025, Pratyush Ghosh enhanced the NREL-Sienna/PowerSystems.jl repository by expanding its public API to include the is_concave utility function. This work focused on incremental API design and careful module import management in Julia, enabling cross-module reuse and improving the developer experience for downstream modules. By exposing is_concave and updating the internal import list, Pratyush facilitated broader integration of analytical utilities within the codebase. The changes, traceable to a specific commit, addressed the need for a richer and more reusable API surface, demonstrating a methodical approach to software engineering and thoughtful attention to maintainability and extensibility.