21st.dev Agent Elements
Open-source registry of agent UI primitives — chat shell, tool-call cards (Bash, Edit, Search, Todo, Plan), clarifying questions, input bar, streaming markdown. Built on React 19, Tailwind v4, and the Vercel AI SDK.
Open-source registry of agent UI primitives — chat shell, tool-call cards (Bash, Edit, Search, Todo, Plan), clarifying questions, input bar, streaming markdown. Built on React 19, Tailwind v4, and the Vercel AI SDK.