The official shadcn/ui skill: detects the project setup, adds and updates components with the CLI, and follows the library's styling and composition rules.
React component API patterns from Vercel: compound components, lifted state, no boolean prop sprawl, React 19 APIs.
Keeps buttons, inputs, badges and pills consistent in radius, border, height, shadow and color, so they speak one interaction language.
Ant Design's skill: looks up props, demos, tokens and deprecations with the bundled CLI while writing antd code.
Builds chat, agent and tool-call interfaces in React with 21st.dev's Agent Elements components.