[skill request] /agy — Antigravity CLI wrapper as a peer second-opinion tool (like /codex)

[Openclaw-Metis]

Summary

Google released Antigravity CLI (agy), a Gemini-backed coding agent CLI that mirrors the Claude / Codex CLI shape (-p print mode, -c continue, --add-dir, plugin system, sandbox mode). It would slot naturally next to /codex as a third independent voice for review / challenge / consult.

Please consider adding a /agy skill — same three-mode shape as /codex:

• /agy review — independent diff review against the base branch, pass/fail gate
• /agy challenge — adversarial second opinion that tries to break the change
• /agy consult — open-ended Q&A with session continuity (agy -c)

The pitch: /codex already gives users one external voice. Adding /agy makes the second-opinion pattern provider-diverse (OpenAI + Google), which is exactly the value of asking outside the family — diverging training data, diverging failure modes.

Why now

agy v1.0.0 is shipped and the print-mode contract is stable enough to wrap:

$ agy --version
1.0.0

$ agy -p "你叫什麼名字？你是什麼模型？"
我是 Antigravity，是一個由 Google DeepMind 團隊所開發、
基於 Gemini 3.5 Flash 模型的 AI 程式設計助手。

-p, --print-timeout, -c, --add-dir, --dangerously-skip-permissions, --sandbox, and a plugin subcommand are all already present (agy --help), so the wrapper surface is roughly 1:1 with the existing /codex skill.

Suggested implementation notes

• Mirror ~/.claude/skills/codex/SKILL.md layout — same preamble, same review/challenge/consult split.
• Use agy -p + --print-timeout for one-shot review/challenge; use agy -c for the consult follow-up loop.
• Pipe the diff via --add-dir (so agy sees the working tree) rather than stdin-stuffing the prompt, to keep large diffs out of the prompt window.
• Default model is fine — but expose a way to override via env var (AGY_MODEL or similar) for users who want Gemini 3.5 Pro vs Flash.
• Detect missing CLI gracefully, same as /codex does for codex.

Related

• /codex skill — the obvious template
• add support for Antigravity? #350 (closed, not-planned) was about running gstack on Antigravity (host-side). This request is the opposite direction: gstack calling agy as a peer tool, the same way it calls codex today.

Happy to help test if useful.