The MongoDB Realm Design Team has identified 11 key principles to guide the design of a user-centered Command-Line Interface (CLI). These principles aim to improve the overall experience of using CLIs, making them more accessible, intuitive, and efficient. The team conducted extensive research and usability testing to inform these principles, which are modeled after Don Norman's Usability Heuristics. By applying these principles, designers and developers can create effective and user-friendly CLIs that enhance the productivity and satisfaction of users.