This is a real-time design tool that runs in the browser while Claude pushes commands via MCP. You create a session, the user opens a URL, and every add_section or batch_update renders instantly. The workflow is JSX with Tailwind classes mapping to actual HTML elements, so you're building semantic web layouts, not generating static mockups. It includes 68 tools for everything from alignment and animations to document state inspection. Useful when you want Claude to visually prototype landing pages, dashboards, or app UIs without switching to a separate design tool. Sessions expire after two hours, and you can attach to an existing URL instead of creating duplicates if the MCP process restarts.
npx skills add https://github.com/pablostanley/efecto-plugin --skill efecto-web-design