Using Hydracept for Antigravity

The Antigravity marketplace connector is https://api.hydracept.com/mcp/antigravity. When Antigravity asks you to sign in, use your Hydracept account and choose Allow. That connection is OAuth. Do not paste a Hydracept API key. This URL rejects API keys.

The marketplace connection includes text, reasoning, structured execution, jobs, quoting, and receipts. It does not generate images, video, audio, or 3D.

Marketplace install

After Hydracept is listed in the Antigravity Plugin Marketplace, open Customizations → Marketplace, install Hydracept, and complete the browser sign-in when prompted.

Until the listing is live, install from the public plugin directory in zencodeinc/hydracept-public with agy plugin install ./public/agents/antigravity.

Manual mcp_config.json

{
  "mcpServers": {
    "hydracept": {
      "serverUrl": "https://api.hydracept.com/mcp/antigravity"
    }
  }
}

The full custom connector is a separate install at https://api.hydracept.com/mcp. That install uses a Hydracept API key as a bearer token, and it is not the marketplace listing. Add it only when you need image, video, audio, 3D, or the rest of the public catalog.