Google Antigravity Integration

AI Integrations

Connect the Silverile MCP server to Google Antigravity by manually editing mcp_config.json. This approach bypasses the interactive browser OAuth flow, which can cause connection timeouts or IDE UI errors, and lets you authenticate directly with your Silverile Bearer token.

Prerequisites

Before you start, generate your Silverile Bearer Token — a base64url-encoded string that bundles your API key and workspace into a single credential.

Step A — Get your API key

1Log in to silverile.com
2Go to User Settings → Settings → IDE API Keys and click Generate Key
3Copy the Key ID (looks like ide_XXXXXXXXXXXXXXXX) and the Key Secret
Keep the Key Secret private — it cannot be recovered after you leave the key generation page.

Step B — Find your Product ID

Open your Silverile project and go to Project Settings. The Product ID is listed there as a number (e.g. 1424).

Step C — Generate the Bearer Token

Run the following command in a terminal, substituting your own values. It produces a URL-safe base64 string with no padding:

echo -n '{"keyId":"ide_XXXXXXXXXXXXXXXX","keySecret":"your_key_secret_here","productId":12}' \
  | openssl base64 -A \
  | tr '+/' '-_' \
  | tr -d '='
The output — a string starting with eyJrZXlJZCI6... — is your Bearer Token. Copy it and use it in Step 2 below.

Step 1 — Open the mcp_config.json file

You can access the configuration file in two ways:

Option A — From the Antigravity IDE UI

1Open the Agent Panel in the sidebar
2Click the ... (three dots) menu at the top of the panel and select Manage MCP Servers
3Click View raw config to open mcp_config.json directly in the editor

Option B — From the filesystem

Open the file directly in your preferred text editor:

PlatformPath
macOS / Linux~/.gemini/antigravity/mcp_config.json
Windows%USERPROFILE%\.gemini\antigravity\mcp_config.json

Step 2 — Add the Silverile server configuration

Add the silverile entry under the mcpServers object in the JSON file, replacing YOUR_SILVERILE_BEARER_TOKEN with the token you retrieved above:

{
  "mcpServers": {
    "silverile": {
      "serverUrl": "https://mcp.silverile.com/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_SILVERILE_BEARER_TOKEN"
      }
    }
  }
}
Ensure the URL key is configured exactly as serverUrl — Antigravity does not support the standard url key for remote HTTP / SSE servers.

Step 3 — Reload and verify

1Save the mcp_config.json file
2Go back to the Installed MCP Servers view in the Antigravity Agent Panel
3Click the Refresh button to apply the changes
4(Optional) If the dot does not immediately turn green, restart the Antigravity IDE to reload the backend connection

Once successfully connected, you will see a green dot next to silverile and all of its tools will be available to the agent.

Troubleshooting

Green dot never appears after saving

Click the Refresh button in the Installed MCP Servers view. If it still does not turn green, fully restart the Antigravity IDE to reload the backend connection.

Connection rejected or 401 errors

Confirm you pasted the full Bearer token with no extra whitespace. The token is a Base64-encoded string — regenerate it from your Silverile account under Settings → IDE API Keys if you are unsure.

Config key not recognised ("url" not supported)

Antigravity requires the key to be spelled exactly as serverUrl (not url). Check your mcp_config.json and correct the key name.

mcp_config.json file not found

The file may not yet exist if you have never configured an MCP server. Create it at the path shown in Step 1 with the JSON structure from Step 2.

Tools not visible after a successful connection

Go back to the Installed MCP Servers view and click Refresh. If tools are still missing, disconnect and reconnect the server.

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