# Antigravity

Antigravity keeps its MCP servers in `mcp_config.json` (on Linux and macOS: `~/.gemini/config/mcp_config.json`). blink artifacts uses the `serverUrl` key with an `Authorization` header.

## Add the server

Create a token in the app under **Agent connection**, then add this to `mcp_config.json`, replacing `<TOKEN>`:

```json
{
  "mcpServers": {
    "blink-artifact": {
      "serverUrl": "https://artifact.blinkbrosai.com/mcp",
      "headers": { "Authorization": "Bearer <TOKEN>" }
    }
  }
}
```

If the file already lists other servers, add `blink-artifact` inside the same `mcpServers` object. Reload the servers or start a new session so the agent sees the tools.

## The artifact link under the prompt

Antigravity can show a clickable `⧉ <title>` under the prompt: the artifact the agent worked on last. Click it to open that artifact in your browser.

It runs a small script that needs Node.js 18 or newer. Download it and save your token where the script can read it, replacing `<TOKEN>`:

```bash
mkdir -p ~/.blink
curl -fsSL https://artifact.blinkbrosai.com/statusline.mjs -o ~/.blink/statusline.mjs
(umask 077; printf '%s\n' '<TOKEN>' > ~/.blink-artifact-token)
```

The script can also read the token from the `BLINK_ARTIFACT_TOKEN` environment variable instead of the file.

Then add this to `~/.gemini/antigravity-cli/settings.json`:

```json
{
  "statusLine": {
    "type": "command",
    "command": "node ~/.blink/statusline.mjs",
    "stack_with_default": true
  }
}
```

If the file already has other settings, add `statusLine` next to them. `stack_with_default` keeps Antigravity's own status line and shows the link below it. Start a new session so it shows the line. You can also run `/statusline node ~/.blink/statusline.mjs` inside Antigravity: it takes effect at once, but replaces the built-in status line.

## Listening for questions

For the `antigravity` harness the listener follows the stream in a background terminal and writes questions to an inbox file, which the agent reads at the start of each turn. Ask the agent to listen for questions; `get_listener` returns the commands. See [Listener & asks_wait](/docs/listener).

## Plugins

Antigravity also supports plugins (`agy plugin install`) that can bundle MCP servers. Its documentation does not say whether a plugin's `mcp_config.json` can read the token from an environment variable, so we recommend the manual setup above, which keeps the token on your machine only.