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Collaborating with Antigravity (agy)

Delegate code review, research, and debugging to Google's Antigravity CLI (agy) as an independent second agent.

Dev & CodingAdvanced★ 131⑂ 17AI score 8/10Last updated: Sep 13, 2026

What it does

  • Wraps Google's Antigravity CLI (agy, successor to the retired Gemini CLI) behind a Python bridge script (scripts/agy_bridge.py) running in headless print mode.
  • Returns structured JSON (success, SESSION_ID, agent_messages, warnings) while streaming live progress to stderr.
  • Enables multi-turn sessions by recovering and reusing the conversation ID that raw agy never prints.
  • Ships safety defaults: sandbox on by default, diff-only output convention, no secrets or production data, and consent-gated --skip-permissions.
  • Explains host-side permission gates (Claude Code / Codex) so a silently denied bridge call is diagnosed instead of faked.

Who it's for

  • Developers who want an independent second opinion from another model while working in Claude Code.
  • Anyone needing web-grounded research or screenshot/image analysis from a delegate agent.
  • Builders of multi-agent workflows that orchestrate several CLI agents.

Examples

  1. Ask for a review of login() in src/auth.py with OUTPUT: Unified Diff Patch ONLY. so nothing gets edited.
  2. Turn 1 analyzes a bug; save the returned SESSION_ID and resume in turn 2 with "propose a fix as a unified diff."
  3. Probe --list-models, then route quick checks to Flash (Low) and hard design calls to Gemini Pro or Claude.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/appautomaton/agent-designer/HEAD/skills/collaborating-with-antigravity/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/collaborating-with-antigravity folder from the GitHub repo appautomaton/agent-designer into my ~/.claude/skills/collaborating-with-antigravity/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/appautomaton/agent-designer.git /tmp/agent-designer && mkdir -p ~/.claude/skills && cp -r /tmp/agent-designer/skills/collaborating-with-antigravity ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Prerequisites: install python3 and Google's Antigravity CLI (agy).
  2. Run agy once and sign in with your Google account (token lands in ~/.gemini/antigravity-cli/).
  3. Clone the repo: git clone https://github.com/appautomaton/agent-designer.git
  4. Copy the skill: mkdir -p ~/.claude/skills && cp -r agent-designer/skills/collaborating-with-antigravity ~/.claude/skills/
  5. Add "Bash(python3 *collaborating-with-antigravity*bridge.py*)" to permissions.allow in your Claude Code settings.json (sandboxed hosts also need the same pattern in sandbox.excludedCommands).
  6. Smoke test: python3 ~/.claude/skills/collaborating-with-antigravity/scripts/agy_bridge.py --help
  7. Restart Claude Code and try: "get a second opinion from agy on this diff."
View source on GitHub ↗