Antigravity Reverseproxy API — Development skill for Claude Code

Antigravity Claude Proxy

[](https://opensource.org/licenses/MIT)

A proxy server that exposes both **Anthropic-compatible** and **OpenAI-compatible** APIs backed by **Antigravity's Cloud Code**, letting you use Claude and Gemini models with **Claude Code CLI**, **OpenAI SDK**, and other compatible clients.

How It Works

┌──────────────────┐     ┌─────────────────────┐     ┌────────────────────────────┐
│   Claude Code    │────▶│                     │     │                            │
│   (Anthropic)    │     │  This Proxy Server  │────▶│  Antigravity Cloud Code    │
├──────────────────┤     │  (Anthropic/OpenAI  │     │  (daily-cloudcode-pa.      │
│   OpenAI SDK     │────▶│   → Google GenAI)   │     │   sandbox.googleapis.com)  │
│   (OpenAI)       │     │                     │     │                            │
└──────────────────┘     └─────────────────────┘     └────────────────────────────┘

1. Receives requests in Anthropic Messages API or OpenAI Chat Completions API format
2. Uses OAuth tokens from added Google accounts (or Antigravity's local database)
3. Transforms to Google Generative AI format with Cloud Code wrapping
4. Sends to Antigravity's Cloud Code API
5. Converts responses back to Anthropic or OpenAI format with full thinking/streaming support

Prerequisites

• Node.js 18 or later (for local runs and OAuth account setup)
• Antigravity installed (optional, for single-account mode) OR Google account(s) for multi-account mode
• Docker (optional, to run the proxy as a container)
• Cloudflare account + Wrangler (optional, to run as a Cloudflare Worker)

---

Run Options

Docker (Local) — recommended

One command (builds image, runs OAuth setup if needed, starts the proxy):

bash bin/docker-local.sh

Proxy runs at `http://localhost:48123`.

Accounts are stored in a named Docker volume (`antigravity_proxy_data`) at