Antigravity Claude Proxy is a server that translates Anthropic-style API requests into calls to Claude and Gemini models through Google's Antigravity Cloud Code service. It is intended for users who want to use those models with Claude Code or OpenClaw, though the project warns that Google accounts connected to it may be restricted or banned.
Borrowing it
Nothing to install: this file belongs to badrisnarayanan/antigravity-claude-proxy. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/badrisnarayanan/antigravity-claude-proxy/main/CLAUDE.mdgit clone --depth 1 https://github.com/badrisnarayanan/antigravity-claude-proxyWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/badrisnarayanan/antigravity-claude-proxy/claude-md)<a href="https://agentmods.dev/instructions/badrisnarayanan/antigravity-claude-proxy/claude-md"><img src="https://agentmods.dev/badge/instructions/badrisnarayanan/antigravity-claude-proxy/claude-md.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00623 | $0.00623 |
| Opus 5 | $0.00311 | $0.00311 |
| Sonnet 5 | $0.00125 | $0.00125 |
| Haiku 4.5 | $0.00062 | $0.00062 |
Grade A, and why
antigravity-claude-proxy CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
Node.js proxy that exposes an Anthropic-compatible API backed by Google's Cloud Code service, letting Claude Code CLI use Gemini (and Claude) models via Google accounts with multi-account quota management.
Request flow: Claude Code CLI → Express (server.js) → CloudCode client → Antigravity Cloud Code API
Commands
npm install # installs deps and builds CSS (prepare hook)
npm start # port 8080
npm run dev # watch server files
npm run dev:full # watch CSS + server files
npm start -- --strategy=sticky # cache-optimized (default is hybrid)
npm start -- --strategy=round-robin # load-balanced
npm start -- --fallback # fall back to alternate model on quota exhaustion
npm start -- --dev-mode # enables debug logging + dev tools (--debug is a legacy alias)
npm run build:css # compile Tailwind once
npm run watch:css # watch CSS
npm run accounts:add # add Google account via OAuth
npm run accounts:add -- --no-browser # headless/manual code input
npm run accounts:list
npm run accounts:verify
npm test # requires server running on port 8080
node tests/run-all.cjs <filter> # run matching tests only
node tests/test-strategies.cjs # strategy unit tests (no server needed)
Non-obvious things
CSS: Source is public/css/src/input.css (Tailwind + @apply). Compiled output is public/css/style.css — don't edit the compiled file.
Quota thresholds are stored as fractions (0–0.99) but displayed as percentages in the UI. Three-tier resolution: per-model > per-account > global.
cache_control stripping: Claude Code CLI sends cache_control on content blocks; Cloud Code API rejects them. Stripped at the start of convertAnthropicToGoogle() before any other processing.
Cross-model thinking signatures: Claude and Gemini signatures are incompatible. When switching models mid-conversation, mismatched signatures are dropped. Gemini targets: strict (drop unknown). Claude targets: lenient (let Claude validate).
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 52 lines · 623 tokens per session scan A 2666fc10eec2
antigravity-claude-proxy CLAUDE.md is an instructions file published in the GitHub repository badrisnarayanan/antigravity-claude-proxy (3,948 stars, last pushed 2d ago), licensed MIT. It adds 623 tokens to every session, about $0.0031 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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