Connecting Mergado MCP to Google Antigravity#

If you use Gemini models in your work, you can connect them to Mergado MCP using the Google Antigravity app.
You can download Google Antigravity here: https://antigravity.google/download

Connection details#

Steps#

1. Find the MCP servers configuration file#

After installing the app, you first need to find the configuration file mcp_config.json, where Google Antigravity stores the MCP server settings.

macOS#

• Open Finder.
• Press ⌘ + Shift + G.
• Paste the path:

~/.gemini/config/mcp_config.json

Windows#

• Open File Explorer.
• Paste this into the address bar:

%USERPROFILE%\.gemini\config\mcp_config.json

• Confirm with Enter.

Note: The .gemini folder is hidden by default. Using this path means you don’t need to unhide it first.

2. Open the configuration file in a text editor#

macOS#

• Right-click the file and select Open With → TextEdit

Windows#

• Open the file in, for example, Notepad or Visual Studio Code.

Paste this into the file:

{
  "mcpServers": {
    "mergado": {
      "serverUrl": "https://mcp.mergado.com"
    }
  }
}

Note: If the file already contains configuration for other MCP servers, just add the mergado entry.

3. Open the MCP settings#

Open the app settings (Settings → Customizations → Installed MCP Servers) and click Refresh.

4. Authorize the new MCP#

Once the new MCP server loads, click Authenticate to start the app’s authorization.

5. Authorize the app in Mergado.#

• Sign in.
• Review the permissions.
• Click Allow.

6. Copy the authorization code.#

Once authorization is complete, Google Antigravity displays a one-time authorization code. Copy it to your clipboard.

7. Paste it into the app and click Submit.#

If it still shows Unauthorized, that’s normal.

8. Restart the app.#

Now quit the app completely.

Important: Also quit the app from the menu bar, since it may keep running in the background.

9. Check that the connection is working.#

Open Settings → Customizations → Installed MCP Servers again. If the MCP server shows a green icon and displays the number of available tools, the connection was successful.

10. Test the connection.#

Open a new chat and try, for example:

List the available Mergado MCP tools.

or

What Mergado MCP tools do you have available?

Note: The first time you use each MCP tool, Google Antigravity will ask whether it can use it. We recommend choosing Yes, and always allow if you trust the MCP server.