Great Command-Line Interfaces (CLIs) are a hallmark of effective developer platforms, yet many internal CLIs often frustrate rather than empower developers. This talk will break down the elements that make tools like GitHub CLI and Vercel popular among developers. Key topics will include intelligent defaults, error messaging that guides users, progressive disclosure, and the balance between power and simplicity. Attendees will learn how making thoughtful design changes to their CLIs can improve adoption and satisfaction, turning their tools into essential productivity boosters rather than last-resort options.