Agent Update

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Google Antigravity → Agent Update

Google's agent-first IDE. Built around the Gemini models, and it shares a config tree with Gemini CLI.

Google Antigravity talks to Agent Update over MCP. The server is https://api.tryagentupdate.com/v1/mcp, the transport is Streamable HTTP, and the credential is one header.

Where it goes: ~/.gemini/config/mcp_config.json (global) · .agents/mcp_config.json (workspace)

Setup

~/.gemini/config/mcp_config.json
{
  "mcpServers": {
    "agent-update": {
      "serverUrl": "https://api.tryagentupdate.com/v1/mcp",
      "headers": { "Authorization": "Bearer au_live_..." }
    }
  }
}

Before you file a bug

It is serverUrl, not url. The docs say plainly: "Legacy fields like url or httpUrl are not supported." Antigravity shares the ~/.gemini tree with Gemini CLI, but the schemas are incompatible: ~/.gemini/settings.json wants httpUrl, this file wants serverUrl. Pre-2.x installs used an older product-specific path under ~/.gemini/, so check for a wrong-generation path first if the server never appears.

Check it worked

Ask the agent to text you. A 401 means the token is wrong, or the word Bearer is in there twice. No tool at all means the transport string is wrong. Both are covered in troubleshooting.

Next

The five tools and their arguments are on the MCP page. The same tools over plain HTTP are on the REST page. Every other tool is on the docs index.

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