Worked on the fal-ai/fal repository to enhance input handling by developing Input Region Validation and expanding CLI Argument Support. Introduced a validation function that checks input regions against a centralized registry, ensuring only valid regions are processed through the command-line interface. Refactored the _utils.py module to standardize region formatting, improving code consistency and maintainability. The approach focused on integrating input validation directly into the CLI workflow, preventing invalid data from reaching downstream components. Utilized Python for both CLI development and input validation, resulting in a more reliable user experience and streamlined processing without any major bugs reported during the development period.