UI Consistency makes your project's own design system something the coding agent reads before it writes UI. Ask for a page, a form or a change to one, and the agent first reads how the pages you already have are built: which shared components they use and how, the theme and its tokens, how they validate input and show errors. Then it writes the new page the same way, from a checklist, and has a separate agent compare the result with the page it follows. It works with any UI technology, including plain HTML and CSS, in a single app or a monorepo, and needs no configuration. It reads only your project; it has no server, no network access and no telemetry, and writes nothing into your repository besides the pages you asked for. It needs a project with code to read: in a conversation without one there is nothing for it to follow.