Developed a CLI multi-select prompt feature for the Effect-TS/effect repository, enabling users to select multiple options with support for select all, none, and invert actions. The implementation focused on robust UI rendering, comprehensive input handling, and validation logic to enforce minimum and maximum selection constraints. Leveraging TypeScript and CLI development skills, the work enhanced the command-line interface by streamlining configuration workflows and reducing manual input steps for users. The feature was delivered with clear commit traceability, ensuring maintainability and transparency. No major bugs were reported during this period, reflecting a careful and methodical engineering approach to feature delivery.