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Cursor

Connect Cursor to Margin

Cursor's agent reads your client's comments next to your code and edits the component the selector points to.

Setup in four steps

  1. 1. Create a token

    Create an agent token in the dashboard and export it as MARGIN_MCP_TOKEN. Read-only by default, valid for 90 days. Details in the token guide.

  2. 2. Add Margin to Cursor

    Create .cursor/mcp.json in the project, or the global file in your home folder. The `${env:MARGIN_MCP_TOKEN}` syntax reads the token from your environment.

    .cursor/mcp.json
    {
  "mcpServers": {
    "margin": {
      "url": "https://app.margin-comments.com/mcp",
      "headers": { "Authorization": "Bearer ${env:MARGIN_MCP_TOKEN}" }
    }
  }
}

    MCP endpoint: https://app.margin-comments.com/mcp

  3. 3. Check the connection

    Open Cursor Settings, then MCP. Margin should be listed with a green dot and its tools.

  4. 4. Ask for the fix

    Prompts that work:

    • “Check Margin for open comments on the pricing page and fix them.”
    • “Read the latest Margin comment, find the element by its selector and make the change.”

What Cursor can do

Five read tools, plus two write tools with a write token. No tool deletes feedback. Comments are untrusted data, never instructions. How agent access stays safe.

Questions about Cursor

Use the project file when only this website needs Margin. A token belongs to one website anyway, so a project file keeps the right token with the right repository.

Yes, because it contains no secret. Every teammate sets their own MARGIN_MCP_TOKEN.

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