Antigravity Claude Proxy

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A proxy server that exposes an Anthropic-compatible API backed by Antigravity's Cloud Code, letting you use Claude and Gemini models with Claude Code CLI.

How It Works

┌──────────────────┐     ┌─────────────────────┐     ┌────────────────────────────┐
│   Claude Code    │────▶│  This Proxy Server  │────▶│  Antigravity Cloud Code    │
│   (Anthropic     │     │  (Anthropic → Google│     │  (daily-cloudcode-pa.      │
│    API format)   │     │   Generative AI)    │     │   sandbox.googleapis.com)  │
└──────────────────┘     └─────────────────────┘     └────────────────────────────┘

1. Receives requests in Anthropic Messages 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 format with full thinking/streaming support

Prerequisites

• Node.js 18 or later
• Antigravity installed (for single-account mode) OR Google account(s) for multi-account mode

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Installation

Option 1: npm (Recommended)

# Run directly with npx (no install needed)
npx antigravity-claude-proxy start

# Or install globally
npm install -g antigravity-claude-proxy
antigravity-claude-proxy start

Option 2: Clone Repository

git clone https://github.com/badri-s2001/antigravity-claude-proxy.git
cd antigravity-claude-proxy
npm install
npm start

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Quick Start

1. Add Account(s)

You have two options:

Option A: Use Antigravity (Single Account)

If you have Antigravity installed and logged in, the proxy will automatically extract your token. No additional setup needed.

Option B: Add Google Accounts via OAuth (Recommended for Multi-Account)

Add one or more Google accounts for load balancing:

# If installed via npm
antigravity-claude-proxy accounts add

# If using npx
npx antigravity-claude-proxy accounts add

# If cloned locally
npm run accounts:add

This opens your browser for Google OAuth. Sign in and authorize access. Repeat for multiple accounts.

Manage accounts:

# List all accounts
antigravity-claude-proxy accounts list

# Verify accounts are working
antigravity-claude-proxy accounts verify

# Interactive account management
antigravity-claud...