Agent-Skills.md

Agent Skills: Invoking Antigravity

Install and drive Google's Antigravity CLI (`agy`) as a non-interactive sub-agent. Use when orchestrating agy, running Antigravity agents from a script or sandbox, delegating a task to Google's agent harness, or wanting a Gemini-backed peer agent alongside Claude.

UncategorizedID: oaustegard/claude-skills/invoking-antigravity

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oaustegard/claude-skills
oaustegardLicense: MIT
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Install this agent skill to your local

pnpm dlx add-skill https://github.com/oaustegard/claude-skills/tree/HEAD/invoking-antigravity

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invoking-antigravity/SKILL.md

Skill Metadata

Name
invoking-antigravity
Description
Install and drive Google's Antigravity CLI (`agy`) as a non-interactive sub-agent. Use when orchestrating agy, running Antigravity agents from a script or sandbox, delegating a task to Google's agent harness, or wanting a Gemini-backed peer agent alongside Claude.

Invoking Antigravity

Run Google's Antigravity CLI (agy) headless, then call agy -p "<task>" as an orchestrated sub-agent on Google's harness (Gemini 3.5 Flash).

Install, authenticate once, orchestrate. For the why behind any step — the 30 s timeout, the keyring fallback, the token format, network hosts, troubleshooting — read references/auth-internals.md.

When to use

  • Orchestrating agy as a sub-agent: shell out, capture stdout, fold back.
  • Running Antigravity agents from a script, CI, or sandboxed container.
  • Wanting a second opinion from Google's harness alongside Claude.

For interactive local use, skip this — run agy directly and it opens a browser.

1. Install

curl -fsSL https://antigravity.google/cli/install.sh | bash

Idempotent, ~3 s, installs ~/.local/bin/agy.

2. Authenticate — once, human-in-the-loop

Export these in every shell that runs agy, so it stores the token in a file rather than an OS keyring:

export SSH_CONNECTION="203.0.113.1 50000 203.0.113.2 22"
export SSH_CLIENT="203.0.113.1 50000 22"
export SSH_TTY="/dev/pts/0"

Run the broker, then relay the login to a human:

python3 scripts/agy_auth_broker.py &      # spawns agy, captures the OAuth URL
sleep 15 && cat /tmp/agybroker/url         # a human opens this and consents
printf '<code>' > /tmp/agybroker/code      # paste the authorization code back

agy writes the token to ~/.gemini/antigravity-cli/antigravity-oauth-token; later agy -p calls run silently. Complete the login within a few minutes — an idle container pause kills the broker's agy process.

3. Orchestrate

agy --dangerously-skip-permissions -p "<task>"

Place every flag before -p — it treats the next argument as the prompt. Add --add-dir <path>, --print-timeout 10m, or --conversation <id> as the task needs.

Reuse auth on a fresh container

Save ~/.gemini/antigravity-cli/antigravity-oauth-token and write it back (with the SSH vars set) — its refresh_token is durable, so no repeat OAuth. Keep the file out of git and logs; it is a personal Google credential.