Google Antigravity + Nitrosend

Google Antigravity runs agents in its App, CLI (agy) and IDE extensions. The Nitrosend plugin adds the remote MCP server, seven Nitrosend skills and an email marketing agent in one install. Sign-in uses OAuth, so there is no API key to paste.

Option 1: Install the plugin (recommended)

Step 1: Install

From your shell:

agy plugin install https://github.com/nitrosend/claude

The CLI installs plugins to ~/.gemini/config/plugins/, which the Antigravity App and IDE also read. Check it with agy plugin list; you should see nitrosend with 7 skills, 1 agent and 1 MCP server.

Step 2: Sign in

1. Open Agent settings with Cmd + , (macOS) or Ctrl + , (Windows and Linux).
2. Go to Customizations and click Authenticate next to nitrosend.
3. Sign in to Nitrosend in your browser, or create a free account. Choose the account and access, then click Connect.
4. Copy the authorization code Antigravity shows, paste it into the settings panel and click Submit.

Antigravity stores the token and refreshes it for you.

Step 3: Verify

Ask the agent:

What's my Nitrosend account status?

It calls nitro_get_status and shows your account, current brand and sending readiness.

What the plugin adds

Composing never sends. Campaigns and flows go live only after a separate approve step, and the skills tell the agent to stop and ask you first.

Option 2: MCP server only

Add Nitrosend to ~/.gemini/config/mcp_config.json for every workspace, or to .agents/mcp_config.json for one workspace:

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

Or from your shell:

agy mcp add nitrosend https://api.nitrosend.com/mcp

Then sign in as in Step 2 above.

To add the skills without the plugin, run npx skills add nitrosend/claude.

Example prompts

Set up my Brand Kit from https://mysite.com and draft a product launch email.

Build a welcome flow: send a welcome email when a contact subscribes, wait 3 days, then send a follow-up.

Show me open and click rates for my last campaign compared to benchmarks.

Troubleshooting