Google Antigravity Integration

AI Integrations

Connect Antigravity to the hosted Silverile MCP server using its MCP configuration file, then complete the one-time browser authorization-code flow.

Prerequisites

  • A Silverile account with at least one project
  • Google Antigravity installed and open

Step 1 — Open the MCP configuration

1Open Settings in Antigravity.
2Select Customizations.
3Under Installed MCP Servers, select Open MCP Config.
4Open mcp_config.json in a plain-text editor, such as TextEdit.
Antigravity Customizations settings with the Open MCP Config button

Open Settings → Customizations, then select Open MCP Config.

The default file locations are:

PlatformPath
macOS / Linux~/.gemini/antigravity/config/mcp_config.json
Windows%USERPROFILE%\.gemini\antigravity\config\mcp_config.json
The Antigravity config folder containing mcp_config.json

The mcp_config.json file is in Antigravity’s config folder.

Opening mcp_config.json with TextEdit from Finder

On macOS, right-click the file and choose Open With → TextEdit.

Step 2 — Add the Silverile server

Add this entry under mcpServers:

{
  "mcpServers": {
    "silverile": {
      "type": "http",
      "url": "https://mcp.silverile.com/mcp",
      "oauth": {
        "clientId": "silverile-mcp"
      }
    }
  }
}
Use the configuration exactly as shown. Do not add headers, an Authorization value, or a bearer token.
mcp_config.json containing the Silverile HTTP MCP server configuration

Save the Silverile server configuration in mcp_config.json.

Step 3 — Authenticate and verify

1Save mcp_config.json
2Return to Installed MCP Servers and click Refresh
3Click Authenticate for Silverile
4On the Google Antigravity page that opens, select Copy to Clipboard to copy the authorization code
5Return to Antigravity, paste the code into Paste auth code, and select Submit
6Click Refresh again to reload the server status
7Confirm the Silverile indicator is green and its tools are listed
After you submit the authorization code, click Refresh once more. The server can briefly continue to show Unauthorized until Antigravity reloads it.
Silverile server in Antigravity with the Authenticate button

The initial Unauthorized message is expected; select Authenticate to start authorization.

Google Antigravity page presenting an authorization code and Copy to Clipboard button

Copy the authorization code from the Google Antigravity page.

Antigravity Silverile server showing the Paste auth code field and Submit button

Paste the code into Antigravity and select Submit, then click Refresh again.

Antigravity Silverile server still showing Unauthorized after an authorization code is submitted

If Unauthorized remains after submission, select Refresh again to show the updated connection.

Silverile MCP server connected in Antigravity with a green status indicator and enabled tools

A green status indicator and enabled tools confirm that Silverile is connected.

Troubleshooting

The Silverile server does not appear after saving the file

Return to Settings → Customizations and click Refresh. Confirm that the file is saved as mcp_config.json in the config folder.

The server still shows Unauthorized after submitting the code

Click Refresh again. Antigravity may need a second refresh to display the connected server and its tools.

The first initialize request returns 401

This is expected before OAuth. Antigravity uses the response to discover the Silverile authorization endpoints.

The authorization page shows a code instead of a Silverile login form

This is expected. Copy the entire code, return to Antigravity, paste it into the auth-code field, and select Submit.

"Unknown OAuth client or unregistered redirect_uri"

Delete the Silverile entry, restart Antigravity, add the entry again, and authenticate. This creates a current OAuth client registration.

Tools are not visible after the second refresh

Restart Antigravity, return to Settings → Customizations, and click Refresh. Then authenticate again if the server prompts you to do so.

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