Official plugin on the Cursor Marketplace

Email marketing, now a Cursor plugin.

Or paste into Cursor’s Agent chat

/add-plugin nitrosend

One command gives Cursor’s agent 28 email tools: campaigns, automation flows, contacts, transactional sends and analytics, all in your brand’s own colors, fonts and tone.

Free plan: 8,000 free emails up front, then 500 free every month. Unlimited contacts on every plan.

The plugin is MIT licensed, source on GitHub.

One prompt. The whole email job.

Cursor’s agent calls Nitrosend tools the way it edits files. You watch each call land, then you approve the send.

Agentsrc/app/signup/route.ts

You

Use Nitrosend to build a 3-email welcome series for new signups. On brand, warm tone. First email straight away, then day 2 and day 5. Send me a test of the first one.

nitro_get_statusBrand Kit loaded, sender verifiedMCP

nitro_compose_flowWelcome series, 3 emails, triggers on signupMCP

nitro_send_test_messageEmail 1 to [email protected]MCP

Cursor

Built the welcome series in your Brand Kit: welcome on signup, getting started on day 2, your three most-read docs on day 5. A test of the first email is in your inbox. Say the word and I’ll set it live.

Looks good. Set it live.

Built in Cursor.

Some of the first people running their email from Cursor.

Installed in under a minute.

Add the plugin

In Cursor’s Agent chat, run:

/add-plugin nitrosend

Or click Add to Cursor on the Marketplace listing, or open Customize in the sidebar, find Nitrosend and choose Install for this project or your whole user.

Sign in once

The first Nitrosend tool call opens a Nitrosend sign-in window. Log in, or create a free account right there.

OAuth handles the rest: no API key, nothing to paste, no restart.

Prompt it

Start with:

Check my Nitrosend account status

Then ask for a campaign, a flow or a test send. Live sends to your list always wait for your approval.

Prefer to manage MCP servers yourself? The manual mcp.json setup

The plugin bundles one remote MCP server. Add the same server by hand in ~/.cursor/mcp.json for every project, or .cursor/mcp.json for this repo only:

.cursor/mcp.json

{
  "mcpServers": {
    "nitrosend": {
      "url": "https://api.nitrosend.com/mcp"
    }
  }
}

Save the file, then run any Nitrosend prompt to trigger sign-in. If Cursor does not pick up the new server, restart it once. One-click alternative: add the MCP server with a Cursor deeplink. Keep one path or the other so Cursor lists a single nitrosend server.

Older Cursor builds without remote MCP support

Route through the stdio bridge instead. It needs Node on the machine:

{
  "mcpServers": {
    "nitrosend": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://api.nitrosend.com/mcp"]
    }
  }
}

What to say once it’s installed.

Nitrosend exposes the whole email workflow as tools. Cursor works out which to call. You describe the outcome.

Campaign
“Use Nitrosend to draft our September product update for the active-customers segment. Pull the highlights from CHANGELOG.md, keep it under 200 words, send me a test.”
Flow
“Use Nitrosend to build a cart abandonment flow: 1 hour, 24 hours, 72 hours. Put a 10% code in the last email.”
Transactional
“Use Nitrosend to send a branded receipt from the Stripe webhook I just wrote. Fire a test with a fake order first.”
Contacts
“Use Nitrosend to import ./data/beta-users.csv into a list called Beta, tagged by plan, and show me the segment counts.”
Agent inbox
“Check my Nitrosend inbox and draft replies to anything that needs one. Flag the ones I should answer myself.”
Analytics
“Use Nitrosend to compare our last five campaigns against benchmarks. Tell me what to change before the next send.”

Why Nitrosend

Built for the builder who already has Cursor open.

Same session as the code

The agent that just shipped your signup form can write the welcome email, wire the receipt to the webhook and schedule the launch campaign without leaving the chat.

On-brand, automatically

Brand Kit reads your site once: colors, fonts, logo, tone of voice. Every email Cursor drafts already looks and sounds like you. No design pass afterwards.

28 tools, one plugin

Nitrosend was MCP-first from day one. Campaigns, flows, contacts, segments, templates, domains, delivery control, agent inboxes, insights. The same tools power Nitrosend in Claude, ChatGPT and Codex.

Grounded in real email data

Every draft is backed by a 68K-word email marketing knowledge base: 908 sources, 4,798 insights and 19 industry playbooks, so the agent knows what works before it writes.

Built by the team behind SmartrMail: 12,000 customers, 6 billion emails, acquired 2022.

Straight answers.

Cost, cloud agents, existing setups and what the plugin actually adds.

Is the Nitrosend plugin free?

Yes. The plugin is free and MIT licensed. Nitrosend itself has a Free plan: 8,000 free emails up front, then 500 free every month, with unlimited contacts. Paid plans start at US$20 a month and every plan, including Free, gets the full MCP, API and CLI.

Does it work in Cursor on the web and in cloud agents?

Yes, with one extra step for cloud agents. The plugin connects to Nitrosend’s hosted MCP server over OAuth, so nothing runs on your machine and it works in the Cursor desktop app and Cursor on the web. Cloud agents keep their own MCP list: add https://api.nitrosend.com/mcp as an HTTP server from the MCP dropdown at cursor.com/agents, or have a team admin share it, then sign in once. OAuth is per user.

I already have Nitrosend in mcp.json. Do I need the plugin?

No. The plugin adds the same server, https://api.nitrosend.com/mcp, so an existing manual setup keeps working. Pick one or the other so Cursor lists a single nitrosend server.

Which tools does the plugin add?

All 28 Nitrosend MCP tools: account and brand (status, Brand Kit, domains, providers, billing), content and delivery (templates, campaigns, flows, review, approval, tests, transactional sends), contacts (import, lists, tags, segments, search), agent inbox and outreach, and insight (query, analytics, docs search, memory, support). Live sends to a list always wait for your approval.