Worked on the Orange-OpenSource/hurl repository to implement header argument validation for curl commands within hurlfmt, focusing on improving input parsing and overall CLI robustness. Developed logic in Rust to enforce strict formatting rules for headers, requiring a colon between name and value or a semicolon for empty values. Enhanced reliability by adding targeted tests that cover both valid and invalid header formats, ensuring malformed headers are rejected at parse time. This approach reduced runtime errors and support overhead, aligning with ongoing quality improvements. The work leveraged command-line interface development, parsing techniques, and comprehensive testing to increase user confidence and project stability.