🛰️ Antigravity plugin for Claude Code
A second model inside Claude Code. Hand a diff or a task to Google's Antigravity CLI (agy, Gemini 3.5) and get the answer back — without leaving your session.
For Claude Code users who want Gemini 3.5 as a second opinion or a second pair of hands — code review, adversarial review, delegated tasks, and an optional "don't let me ship a bug" gate. The Antigravity counterpart to openai/codex-plugin-cc. No API key, no new account — just your local agy login.
See it in action
$ /antigravity:review
# 🛰️ Antigravity — review (Gemini 3.5)
Verdict: needs work
• Critical · cart.js:12 — checkout() passes `percent = undefined` when there's no coupon,
so `amount - amount * undefined` = NaN. Breaks every normal (no-coupon) checkout.
• High · applyCoupon() never clamps `percent`; a value > 1 returns a negative total
("checkout for free, or get paid by the store").
• Medium · float precision (19.990000000000002) will trip payment gateways.
Real output. A different model reviewing your diff catches what the model that wrote it won't.
What you get
| Command | What it does |
|---|
/antigravity:review ⭐ | Read-only cross-model review of your diff (or a branch). --json for structured output. |
/antigravity:adversarial-review | Skeptical red-team review — should this ship at all? |
/antigravity:delegate ⭐ | Hand a task to Gemini 3.5 (write-capable; --read-only / --sandbox to contain it). |
/antigravity:resume | Continue the last conversation with a follow-up. |
/antigravity:setup | Check agy is installed + signed in; toggle the review gate. |
/antigravity:status · result · cancel | Manage background jobs. |
Flags: --background (detach into a tracked job) · --wait (block for the result) · --model <label> · --json
⭐ Opt-in review gate — turn it on and Gemini reviews every code-changing turn before Claude can stop, blocking on real issues. A cross-model safety net. Off by default; fails safe.
Requirements
agy — the Antigravity CLI, installed and signed in (Google OAuth, free preview tier).- Node.js ≥ 18 — the companion is a zero-dependency ESM script.
# install agy (macOS / Linux → ~/.local/bin/agy)
curl -fsSL https://antigravity.google/cli/install.sh | bash
# sign in once (opens a browser); in Claude Code use: ! agy
agy
Windows: irm https://antigravity.google/cli/install.ps1 | iex
Install
/plugin marketplace add dpa-plus/antigravity-plugin-cc
/plugin install antigravity@dpa-antigravity
/antigravity:setup
/antigravity:setup confirms agy is reachable and signed in, and tells you what to fix if not.
Usage
Review your work ⭐
/antigravity:review # uncommitted changes vs HEAD
/antigravity:review --base main # the whole branch vs main
/antigravity:review security and edge cases # steer the focus
/antigravity:review --json # structured JSON output
Read-only and sandboxed — Gemini reads the diff, it never touches your files.
Challenge the change
/antigravity:adversarial-review
/antigravity:adversarial-review --base main rollback safety of the new writer
A skeptical pass: what breaks, which assumptions fail, whether it should ship at all.
Delegate a task ⭐
/antigravity:delegate add a --csv flag to the export script and update its tests
/antigravity:delegate --read-only explain the retry logic in client.ts
/antigravity:delegate --background port utils from CommonJS to ESM # then: /status, /result
Write-capable by default — it can edit files and run commands. Add --read-only or --sandbox to contain it.
Continue & manage jobs
/antigravity:resume now add unit tests for that
/antigravity:status # background jobs for this repo
/antigravity:result # latest finished job's output
/antigravity:cancel <job-id>
