@nuntly/sdk-mcp) gives the Cursor agent tools to send email, manage domains and webhooks, and read and reply to inbound messages. Check the prerequisites first: an API key and Node.js 20 or later.
Set up from a one-line prompt
Paste this line into the Cursor agent, in the project you want to set up. The agent follows an install guide written for it, asks you to create the API key, sends a test email to your address, and ends with a setup report.Create an API key
In the dashboard, go to API Keys and create a key with the Sending only permission, and leave Restrict to domains empty. Copy it. Pick Full access instead for an agent that manages domains, inboxes, webhooks or agent memory. See API keys.Add the MCP server
Install in Cursor. After the install, open Customize in the sidebar, edit thenuntly server, and replace your-api-key with your key. Save and close the file, then turn the server off and on with its toggle so that it starts with your key.
If the link does not open Cursor, add the server by hand:
~/.cursor/mcp.json (%USERPROFILE%.cursor\mcp.json on Windows)
Send a test email
Ask your agent: “Send a test email from hello@onboarding.nuntly.com to my address.” Use the email address of your Nuntly account (the organization owner), exactly as you signed up. This sender only delivers to that address.Troubleshooting
The server does not start. Open the Output panel and select MCP Logs. On native Windows, an error that namesnpx can mean that Cursor cannot start npx directly: set "command": "cmd" and "args": ["/c", "npx", "-y", "@nuntly/sdk-mcp@2"].
For errors shared by every client, such as a tool that returns isError: true, see Troubleshooting.
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