Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add oaustegard/claude-skills --skill invoking-antigravitygit clone --depth 1 https://github.com/oaustegard/claude-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/oaustegard/claude-skills/invoking-antigravity)<a href="https://agentmods.dev/skills/oaustegard/claude-skills/invoking-antigravity"><img src="https://agentmods.dev/badge/skills/oaustegard/claude-skills/invoking-antigravity/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/oaustegard/claude-skills/invoking-antigravity"><img src="https://agentmods.dev/badge/skills/oaustegard/claude-skills/invoking-antigravity.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00062 | $0.00675 |
| Opus 5 | $0.00031 | $0.00338 |
| Sonnet 5 | $0.00012 | $0.00135 |
| Haiku 4.5 | $0.00006 | $0.00068 |
Grade C, and why
invoking-antigravity scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -fsSL https://antigravity.google/cli/install.sh | bash Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL https://antigravity.google/cli/install.sh | bash How it starts
The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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
agyas 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.
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 71 lines · 62 tokens per session scan C dbfc6ddbbd50
invoking-antigravity is a skill published in the GitHub repository oaustegard/claude-skills (148 stars, last pushed yesterday), licensed MIT. It adds 62 tokens to every session and 675 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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