Developed secure login command enhancements for the goharbor/harbor-cli repository, focusing on improving password handling and reducing credential leakage risks. The work enforced mutual exclusivity between the --password and --password-stdin flags, ensuring users could not supply both simultaneously, and updated password flag descriptions to provide clearer security guidance. Using Go and applying security best practices within CLI development, the changes strengthened the authentication process and improved the user experience for developers interacting with the CLI. All modifications were delivered with clear commit traceability, reflecting a methodical approach to both code quality and security posture within the project’s authentication workflow.