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How to use the Extrovert MCP in Google Antigravity

Connect Extrovert to Google Antigravity using the mcp-remote helper

Written by Oleg Sobolev

If you use Google Antigravity as your IDE, you can connect it to Extrovert through our MCP server. The setup takes a couple of minutes and a small one-time install on your machine.

Why this setup is a bit different

Antigravity has a known issue refreshing authentication tokens for third-party MCP servers. If you connect Extrovert to Antigravity directly, the connection works for the first call and then quietly stops — campaigns show up empty, the agent says authentication expired after a minute or two, and creating campaigns fails.

The workaround below uses a small open-source helper called mcp-remote. Antigravity launches it automatically in the background, and it handles the Extrovert sign-in for you, including refreshing the token when it expires. You set it up once and then forget about it.

What you need

  • Google Antigravity installed

  • An active Extrovert account

  • Node.js (version 18 or higher) installed on your computer. If you don't have it, download it from nodejs.org — the standard installer is enough, no command-line work required.

Setting it up

  1. Open Antigravity.

  2. In the agent panel at the top of the editor, click the … menu and choose MCP Servers.

  3. Click Manage MCP Servers, then click View raw config. This opens the mcp_config.json file.

  4. Add the following block inside the mcpServers section of the file:

{
  "mcpServers": {
    "extrovert": {
      "command": "npx",
      "args": ["mcp-remote", "https://mcp.goextrovert.com/mcp"]
    }
  }
}

If you already have other MCP servers configured, just add the "extrovert" entry alongside them inside mcpServers.

  1. Save the file. Antigravity will pick up the change automatically.

  2. A browser window will open asking you to sign in to Extrovert. Sign in with the same account you use on the web.

  3. Once you see the success page, close the browser tab and return to Antigravity. The Extrovert MCP is now connected.

Checking it works

In Antigravity's agent panel, ask:

"List my Extrovert campaigns."

The agent should return your campaigns from the workspace your Extrovert account is signed in to.

Good to know

  • You only sign in once. The helper caches your authentication and refreshes it automatically.

  • It works inside the workspace you're signed in to. If you're a member of multiple workspaces, the MCP uses the one your Extrovert account has selected.

  • You don't need to keep a terminal open. Antigravity launches the helper itself whenever it needs the Extrovert tools.

If something doesn't work

  • "Command not found: npx" — Node.js isn't installed yet, or your computer needs a restart after installing it. Install Node.js from nodejs.org, then restart Antigravity.

  • The browser sign-in window doesn't open — check that no other app is using port 3334 on your computer, then save the config file again.

  • You'd rather not install Node — you can use the Extrovert MCP from Claude Code or Cursor instead. Both connect to Extrovert directly without any extra setup.

Still stuck? Reach out to us in chat and we'll help you get connected.

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