Guillermo N. developed an RPM Spec Language Server for the mason-org/mason-registry repository, focusing on enhancing syntax awareness, validation, and editor integration for RPM spec files. Leveraging the language server protocol and package management expertise, Guillermo implemented the feature using YAML for metadata configuration, including details such as name, description, homepage, license, and supported languages. The server was packaged for easy installation via PyPI, streamlining distribution and onboarding for future contributors. This work addressed the need for standardized tooling in RPM spec authoring, reducing packaging errors and improving developer productivity through a single, well-documented end-to-end feature implementation.