Antigravity Server

Production-grade AI proxy built for agentic coding workloads

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What is this?

A headless Rust server that turns Antigravity accounts into a reliable, production-grade API — purpose-built for agentic coding (Claude Code, Cursor, Cline, OpenCode) where sessions run 50–200+ tool calls without human intervention.

You provide: Antigravity account credentials
You get: OpenAI + Anthropic compatible API that survives rate limits, rotates accounts, and keeps thinking mode stable across long tool-use chains

┌─────────────────┐     ┌─────────────────────┐     ┌──────────────────┐
│  Claude Code    │     │  Antigravity Server │     │                  │
│  Cursor / Cline │ ──► │  ┌───────────────┐  │ ──► │  Google Gemini   │
│  OpenCode       │     │  │ AIMD throttle │  │     │  (via OAuth)     │
│  Any OpenAI SDK │     │  │ Circuit break │  │     │                  │
│                 │     │  │ Sticky session│  │     └──────────────────┘
└─────────────────┘     │  └───────────────┘  │
                        └─────────────────────┘

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Quick Start

cargo build --release -p antigravity-server
./target/release/antigravity-server
# → http://127.0.0.1:8045

Claude Code

export ANTHROPIC_BASE_URL=http://127.0.0.1:8045
export ANTHROPIC_API_KEY=sk-antigravity
claude   # thinking mode works, tool calls stay stable

Cursor / Cline / OpenCode

Set base URL to http://127.0.0.1:8045/v1 with any API key.

Python / OpenAI SDK

import openai

client = openai.OpenAI(
    api_key="sk-antigravity",
    base_url="http://127.0.0.1:8045/v1"
)

response = client.chat.completions.create(
    model="gemini-2.5-pro",
    messages=[{"role": "user", "content": "Hello!"}]
)

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Why This Fork?

The upstream Antigravity-Manager is a Tauri desktop app designed for manual chat. This fork is a headless server rebuilt for unattended, high-throughput agentic workloads.

Architecture

	Upstream (Tauri Desktop)	This Fork (Axum Server)
Runtime	Desktop GUI app (Tauri + React)	Headless VPS/server daemon
Frontend	React + TypeScript	Leptos (Rust → WASM, single binary)
Crate structure	Single src-tauri/ (49k LOC)	Modular workspace: core, types, server (36k LOC)
Deployment	Install on desktop	systemctl, Docker, bare metal

Resilience & Routing — built for agentic

Feature	Upstream	This Fork
Rate limiting	Retry on 429	AIMD predictive throttle (TCP-congestion inspired)
Account selection	Round-robin	Least-connections + tier priority + health scores
Failover	Basic retry	Circuit breakers (per-account, per-endpoint)
Session continuity	None	Sticky sessions — account stays bound to conversation
Thinking mode	Disables on mixed history ⚠️	Always-on — upstream handles mixed history natively
Signature validation	Silent downgrade	Explicit error — client knows when quality degrades
Response validation	None	Thinking degradation detection on every response
Schema caching	None	Atomic schema cache with hit/miss tracking
Observability	GUI dashboard	Prometheus metrics + structured JSON logs

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API

OpenAI-compatible:

• POST /v1/chat/completions — Chat (streaming supported)
• POST /v1/images/generations — Imagen 3
• POST /v1/audio/transcriptions — Whisper-compatible
• GET /v1/models — Available models

Anthropic-compatible:

• POST /v1/messages — Claude messages API (full thinking + signature support)

Management:

• GET /api/resilience/health — Account health + circuit breaker status
• GET /api/resilience/aimd — AIMD rate limit state
• GET /api/metrics — Prometheus metrics

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CLI

antigravity-server account list          # List accounts
antigravity-server account add -f x.json # Import account
antigravity-server account refresh all   # Refresh quotas
antigravity-server status                # Server stats

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Deployment

# ~/.config/systemd/user/antigravity.service
[Unit]
Description=Antigravity Server
After=network.target

[Service]
ExecStart=%h/.local/bin/antigravity-server
Restart=always
Environment=RUST_LOG=info

[Install]
WantedBy=default.target

systemctl --user enable --now antigravity

Variable	Default	Description
ANTIGRAVITY_PORT	8045	Server port
ANTIGRAVITY_DATA_DIR	~/.antigravity_tools	Data directory
RUST_LOG	info	Log level (debug for signature tracing)

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License

Fork of lbjlaq/Antigravity-Manager.
License: CC BY-NC-SA 4.0 — Non-commercial use only.

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_{⚠️ This README was generated by Claude Opus. The repository owner has no idea what's written here.}