zerogravity/README.md

Antigravity Proxy

OpenAI-compatible proxy that intercepts and relays requests to Google's Antigravity language server, impersonating the real Electron webview.

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graph LR
    Client["Client"] -->|"OpenAI / Gemini API"| Proxy["Proxy :8741"]
    Proxy -->|"gRPC (dummy prompt)"| LS["Standalone LS"]
    LS -->|"HTTPS :443"| MITM["MITM :8742"]
    MITM -->|"Modified request<br/>(real prompt + tools)"| Google["Google API"]
    Google -->|"SSE response"| MITM
    MITM -->|"Usage, errors,<br/>function calls"| Proxy
    LS -.->|"iptables redirect<br/>(UID-scoped)"| MITM

    style Proxy fill:#7c3aed,color:#fff
    style MITM fill:#e94560,color:#fff
    style LS fill:#2563eb,color:#fff
    style Google fill:#059669,color:#fff

Quick Start

# Headless mode (no running Antigravity app needed)
RUST_LOG=info ./target/release/antigravity-proxy --headless

# Or use the daemon manager
proxyctl start

Endpoints

Method	Path	Description
POST	/v1/responses	Responses API (sync + streaming)
POST	/v1/chat/completions	Chat Completions API (OpenAI compat)
POST	/v1/gemini	Native Gemini API
POST	/v1beta/models/{model}:{action}	Official Gemini v1beta routes
GET/POST	/v1/search	Web Search via Google grounding
GET	/v1/models	List available models
GET	/v1/sessions	List active sessions
DELETE	/v1/sessions/{id}	Delete a session
POST	/v1/token	Set OAuth token at runtime
GET	/v1/usage	MITM-intercepted token usage
GET	/v1/quota	LS quota and rate limits
GET	/health	Health check

Authentication

The proxy needs an OAuth token:

1. Env var: ANTIGRAVITY_OAUTH_TOKEN=ya29.xxx
2. Token file: ~/.config/antigravity-proxy-token
3. Runtime: curl -X POST http://localhost:8741/v1/token -d '{"token":"ya29.xxx"}'

proxyctl Commands

Command	Description
proxyctl start	Start the proxy daemon
proxyctl stop	Stop the proxy daemon
proxyctl restart	Rebuild + restart
proxyctl rebuild	Build release binary only
proxyctl status	Service status + quota + usage
proxyctl logs [N]	Tail last N lines + follow
proxyctl test [msg]	Quick test request
proxyctl health	Health check

Documentation

Doc	Contents
architecture.md	System overview, module map, request lifecycle (mermaid)
mitm.md	MITM proxy internals, event flow, request modification
traces.md	Per-call debug trace system
extension-server-analysis.md	Extension server protocol reverse engineering
ls-binary-analysis.md	LS binary reverse engineering — model catalog, gRPC services, protos

License

Private. Do not distribute.