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 scarletkc/agents --skill antigravity-cligit clone --depth 1 https://github.com/scarletkc/agentsWrote 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/scarletkc/agents/antigravity-cli)<a href="https://agentmods.dev/skills/scarletkc/agents/antigravity-cli"><img src="https://agentmods.dev/badge/skills/scarletkc/agents/antigravity-cli/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/scarletkc/agents/antigravity-cli"><img src="https://agentmods.dev/badge/skills/scarletkc/agents/antigravity-cli.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 | $0.00045 | $0.01334 |
| Opus 5 | $0.00023 | $0.00667 |
| Sonnet 5 | $0.00009 | $0.00267 |
| Haiku 4.5 | $0.00005 | $0.00133 |
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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Antigravity CLI
Use the installed agy CLI as an external coding agent. The bundled client
returns a task ID immediately and keeps a background worker available for
follow-ups. It runs each turn with official streaming JSON input/output and
resumes the exact Antigravity conversation on the next turn. Waiting for the
process and stderr to finish makes permission denials and partial-output
timeouts visible; each follow-up incurs CLI startup time.
Delegate when the user requests Antigravity or another agent can add value that you can verify. Keep routine work with the supervising agent when the extra startup and review time would outweigh that benefit.
Antigravity CLI must already be installed and authenticated. Run
scripts/agy.py with the project's Python 3.12+ interpreter.
The helper uses only the standard library; when the project has no Python
environment, uv run --python 3.12 <script> ... also works. Resolve the
script relative to this skill, not the project receiving the task.
Assign and follow up
Provide the goal, absolute working directory, relevant files and evidence, scope, and completion check. Antigravity does not inherit the supervising agent's conversation. Use a UTF-8 prompt file for substantial instructions:
python <script> start --cwd <absolute-project-path> --prompt-file <task-file>
python <script> wait <task_id> --timeout 30
python <script> status <task_id>
python <script> reply <task_id> --prompt-file <follow-up-file>
python <script> cancel <task_id>
python <script> close <task_id>
Keep independent work with the supervising agent while the task runs.
wait timing out only returns a snapshot; it does not cancel the task.
reply is accepted after the current turn finishes. Retain the task_id
and close the worker when no more follow-ups are needed.
The helper supplies both the process working directory and --add-dir.
For concurrent edits to overlapping files, use separate worktrees and pass
their paths as --cwd; the helper does not create worktrees. Check actual
output paths, since Antigravity can also write to its conversation artifacts.
What ships with it
3 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.
- today First seen · 123 lines · 45 tokens per session scan A d2e9a06be349
antigravity-cli is a skill published in the GitHub repository scarletkc/agents (208 stars, last pushed today), licensed Apache-2.0. It adds 45 tokens to every session and 1,334 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 2026-09-12.
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