Worked on enhancing the accuracy of the Swift API descriptor in the mrousavy/swift repository by addressing noise caused by Clang header file declarations. Focused on API development and compiler design, the solution introduced origin-based filtering within the Swift compiler to ensure only relevant Swift declarations were recorded, excluding those originating from header files. This targeted fix improved the quality of API records generated by APIGen, resulting in more reliable data for downstream tooling and analytics. The work was implemented using C++ and Swift, demonstrating a methodical approach to refining API data and supporting maintainable, high-quality software development processes.