antigravity-mcp-server

An MCP server that wraps the Google Antigravity CLI (agy) so any MCP client (Claude Code, Claude Desktop, Codex, etc.) can query Gemini-successor models through your local agy install.

Google is retiring the Gemini CLI on June 18, 2026 and replacing it with the Antigravity CLI (agy). This server is the spiritual successor to gemini-mcp-server for that new CLI.

Why

agy runs headlessly (agy -p "<prompt>") and authenticates with your existing Google account OAuth (stored in ~/.gemini). This server simply exposes that headless mode as MCP tools — no extra API keys, it rides your existing subscription.

Install

Requires the Antigravity CLI (agy) installed and logged in:

agy -p "say pong"   # should print: pong

Register with Claude Code

claude mcp add antigravity-cli -- npx -y @talabisaac/antigravity-mcp-server

Or add it manually to your MCP config:

{
  "mcpServers": {
    "antigravity-cli": {
      "command": "npx",
      "args": ["-y", "@talabisaac/antigravity-mcp-server"]
    }
  }
}

If agy is not on the spawned process's PATH, set its absolute path:

{
  "mcpServers": {
    "antigravity-cli": {
      "command": "npx",
      "args": ["-y", "@talabisaac/antigravity-mcp-server"],
      "env": { "AGY_CLI_PATH": "/home/you/.local/bin/agy" }
    }
  }
}

Tools

| Tool | Description | Args | |------|-------------|------| | agy | Query Antigravity (Gemini successor) | prompt (required), addDir[], sandbox | | web-search | Web search with Google Search grounding | query (required), summarize | | ping | Health check | message (optional) | | help | List tools | — |

Include files in a prompt with the @ prefix, e.g. @src/app.ts explain the auth flow.

Environment

| Variable | Purpose | |----------|---------| | AGY_CLI_PATH | Absolute path to the agy binary (default: agy on PATH) | | AGY_MCP_DEBUG | Set to any value to enable debug logging on stderr |

Develop

npm install
npm run build
npm start

License

MIT © Isaac Yoon / TripleA Lab