MCP for Cursor

Before you start

The agent can only install what the project is set up to receive. Add the @efferd registry first. Quick Setup walks through that.

Pro blocks need EFFERD_REGISTRY_TOKEN in .env.local. Free blocks do not need a token. The server reads components.json, so it uses the style you already chose.

Add the server

From the project that should receive the blocks, run:

npx shadcn@latest mcp init --client cursor

That writes .cursor/mcp.json:

{
  "mcpServers": {
    "shadcn": {
      "command": "npx",
      "args": [
        "shadcn@latest",
        "mcp"
      ]
    }
  }
}

Confirm

Reload Cursor and enable shadcn in Settings → MCP. A green dot means it is connected.

Try it

Once the server is connected, copy a prompt and give it to your agent.

Find a hero section from @efferd

Build a landing page using @efferd blocks

Add a pricing block from @efferd

Guidelines

• Match style to the UI you initialized. Use radix-* for Radix, or base-* for Base UI.
• For a large block, have the agent run npx shadcn@latest view @efferd/hero-1 first so it can look at the files before adding them.
• Keep EFFERD_REGISTRY_TOKEN out of git. A Pro install stops if the token is missing.
• Copy the item name from the block preview. A name you invent will not install.
• Leave {style} in the registry URL. The agent fills it in from components.json.

Next steps

• Ask for a block by the name on its preview. The prompts above are a starting point.
• If shadcn does not connect, the shadcn MCP documentation covers troubleshooting.
• Other clients are on the MCP page.