# Google Antigravity

Add Reduck to Google Antigravity by editing its MCP config file, then keep the connection signed in.

Antigravity has no list of ready-made connectors, so you add Reduck by editing a small config
file yourself. It takes a few more clicks than Claude Desktop. The steps below cover the whole
thing.

## Before you start

You need a Reduck account, and a paired browser if you want scripts to run in your own Chrome.
Both are in the [quick start](https://docs.reduck.ai/#quick-start).

## Add the server

Click the top-right corner menu icon (**…**), then select **MCP Servers**.

![Selecting MCP Servers from the Antigravity corner menu](mcp-servers-menu.png)

Click **Manage MCP Servers**.

![The Manage MCP Servers option](manage-mcp-servers.png)

Click **View raw config**.

![The View raw config button](view-raw-config.png)

Add the following to the file:

```json
{
  "mcpServers": {
    "reduck": {
      "serverUrl": "https://mcp.reduck.ai/"
    }
  }
}
```

Save the file and return to **MCP Servers** to confirm `reduck` is listed.

## Check that it worked

Open **MCP Servers**. `reduck` is listed and signed in, and its tools are now available to the
agent. Ask Antigravity to run `whoami`. It replies with the Reduck account you are signed in as,
which confirms the connection end to end.

If `reduck` is not signed in, click **Authenticate** and finish signing in to your Reduck account
in the browser tab that opens.

![Antigravity showing an MCP authentication error](authentication-error.png)

> [!WARNING]
> **Check that `reduck` is still signed in before you trust a result.** If the connection to
> Reduck is lost, Antigravity may answer on its own without running anything from Reduck, and the
> reply still looks normal. Open **MCP Servers** to see whether `reduck` is signed in. If it is
> not, click **Authenticate**.

## Try it

Ask for something on a real site, and let the agent pick the script:

> Use Reduck to get me the weather in Paris for the next two weeks.

Reduck finds a script for the site, runs it, and hands back the result. The
[script catalogue](https://reduck.ai/explore/scripts) lists everything it can already do.