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.
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.