Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add simplybychris/antigravity-plugin-cc/plugin install agyWrote 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/simplybychris/antigravity-plugin-cc/antigravity-cli)<a href="https://agentmods.dev/skills/simplybychris/antigravity-plugin-cc/antigravity-cli"><img src="https://agentmods.dev/badge/skills/simplybychris/antigravity-plugin-cc/antigravity-cli.svg" alt="Measured on agentmods" 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 | $0.00032 | $0.00727 |
| Opus 5 | $0.00016 | $0.00364 |
| Sonnet 5 | $0.00006 | $0.00145 |
| Haiku 4.5 | $0.00003 | $0.00073 |
Grade A, and why
antigravity-cli scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- antigravity-cli — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Antigravity CLI runtime
Use this skill only inside the agy subagent.
Primary helper
bash "${CLAUDE_PLUGIN_ROOT}/scripts/agy-run.sh" ask [--model <alias>] "<prompt>" [agy-flags...]
The wrapper:
- Locates
agyinPATH,~/.local/bin,/opt/antigravity/bin, or/usr/local/bin. - Verifies auth (system keyring OAuth or
ANTIGRAVITY_API_KEY). - Runs
agy -p "<prompt>"non-interactively. - If
--model <alias>is supplied before the prompt, resolves the alias and applies it for the duration of the call (atomic patch of~/.gemini/antigravity-cli/settings.jsonunder a lockfile, restored on exit). - Forwards any extra arguments after the prompt straight to
agy— so… ask "<prompt>" --sandboxbecomesagy -p "<prompt>" --sandbox.
Rules of engagement
One wrapper call per task. The subagent is a forwarder, not an orchestrator —
keep the user's task text intact and let agy do the work.
Strip flags that belong to the parent slash command (--background) before
forwarding. Pass --model <alias> to the wrapper (not to agy directly).
Pass agy-native flags through after the prompt argument.
Model aliases (consumed by the wrapper)
flash-low, flash-medium (flash-med), flash (flash-high),
pro-low, pro (pro-high), sonnet (claude-sonnet),
opus (claude-opus), gpt-oss (gpt-oss-120b). Canonical TUI strings
are also accepted verbatim (e.g. "Claude Opus 4.6 (Thinking)").
Run bash "${CLAUDE_PLUGIN_ROOT}/scripts/agy-run.sh" help for the
authoritative list.
agy-native flags worth knowing
Run agy --help for the full list. Useful ones that go after the
prompt argument:
--sandbox— extra-restrictive execution; only when the user asked for it.--print-timeout 10m— extend the default 5min print timeout.--add-dir <path>— add a directory to the workspace (repeatable).
What this skill does NOT do
- Does not install or authenticate
agy. That is/agy:setup's job. - Does not retry, summarize, or post-process
agy's output. - Does not read files, run
git, or make HTTP calls outside the wrapper.
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.
- 6d ago First seen · 73 lines · 32 tokens per session scan A 1bcf818b98d7
antigravity-cli is a skill published in the GitHub repository simplybychris/antigravity-plugin-cc (75 stars, last pushed 3mo ago), licensed MIT. It adds 32 tokens to every session and 727 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
collaborating-with-antigravity
Delegate analytical, sandboxed, or long-running work to the Google Antigravity (agy) CLI through a JSON-bridge wrapper. Use when you need a second opinion, want to isolate side effects in a worktree, or need to run a long agent loop without blocking the main conversation.
collaborating-with-antigravity
Delegate analytical, sandboxed, or long-running work to the Google Antigravity (agy) CLI via a JSON-bridge wrapper. Use when you need a second opinion, sandboxed execution, or a detached long-running agent loop. Install location is .agents/skills/collaborating-with-antigravity/.
crosstalk
Consult Antigravity (Gemini) from Claude Code without blocking, and route the answer to whichever of your sessions needs it. Use for wide-context reads a second model should carry (large codebase sweeps, long log or transcript analysis, broad web research), for a genuine second opinion on a design or a diagnosis, and…
gemini-3-prompting
Guidance for writing effective prompts for Antigravity (agy) / Gemini 3 models.
agy-result-handling
Internal guidance for presenting agy output back to the user.
agy-delegation
Use when analyzing large files (>200 lines), more than 3 files at once, deep git/grep searches, web lookups, or adversarial reviews - delegates to the Antigravity CLI via claude-agy-mcp MCP tools to save context.