UI.md: The Design Rulebook That Makes Coding Agents Build Better Interfaces

Your coding agent can scaffold a working UI in seconds and still ship something that looks like every other default template. The fix is a UI.md file — a set of design rules your agent reads before it writes a single component. It's the same idea as AGENTS.md, applied to how things look instead of how the codebase behaves. Why your agent's UIs all look the same Most coding agents produce competent but generic interfaces. They reach for the same default spacing, the same button styles, the same…