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MCP ServerGemini CLI

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Connect Sync GTM to the Gemini CLI, Google’s command-line agent. (Custom MCP servers are supported in the Gemini CLI, not the gemini.google.com app.)

Sync GTM uses browser-based sign-in (OAuth). There is no API key — don’t pass -H/--header, and approve in your browser.

Add the Sync GTM server

Add the Sync GTM MCP server with one command:

gemini mcp add -t http --scope user syncgtm https://api.syncgtm.com/mcp

Or add it manually to ~/.gemini/settings.json (the httpUrl key selects streamable HTTP):

{
  "mcpServers": {
    "syncgtm": {
      "httpUrl": "https://api.syncgtm.com/mcp"
    }
  }
}

Authenticate with Sync GTM

  1. Start the Gemini CLI:
gemini
  1. On first connect it opens your default browser to sign in. If it doesn’t open automatically, run /mcp auth syncgtm inside the CLI
  2. Sign in to Sync GTM and approve — return to the Gemini CLI, you’re connected

Verify the connection

Inside the CLI, ask it to list the tools or run a quick check:

Check my connected MCP servers

Don’t pass -H/--header — Sync GTM authenticates through browser OAuth, with no token.

Next steps

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