Invoking Antigravity Skill for Claude

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.

4k tokens

context cost

the whole folder, loaded on every use

files

ships runnable scripts

copies elsewhere

how many repositories repackaged it

137

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/oaustegard/claude-skills --skill invoking-antigravity

The instruction itself

6 sections, as written by the author

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.

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How to use it

Copy the folder

Take oaustegard/invoking-antigravity from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.