dev.21st

mcp

21st.dev

Search 21st.dev UI components & themes, get their code, and generate new ones with 21st AI.

Hosted
Streamable HTTPofficialservice

Deployment

Hosted
streamable-httphttps://21st.dev/api/mcp
Headers
x-api-keyRequired
Your 21st.dev API key (get one at https://21st.dev/mcp). Discovery (initialize, tools/list) works without it; component code retrieval and generation require it.