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 iamcxa/kc-claude-plugins/plugin install kc-team-opsWrote 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/iamcxa/kc-claude-plugins/gemini)<a href="https://agentmods.dev/skills/iamcxa/kc-claude-plugins/gemini"><img src="https://agentmods.dev/badge/skills/iamcxa/kc-claude-plugins/gemini/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/iamcxa/kc-claude-plugins/gemini"><img src="https://agentmods.dev/badge/skills/iamcxa/kc-claude-plugins/gemini.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 | $0.00063 | $0.06264 |
| Opus 5 | $0.00032 | $0.03132 |
| Sonnet 5 | $0.00013 | $0.01253 |
| Haiku 4.5 | $0.00006 | $0.00626 |
Grade A, and why
gemini 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 456 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/gemini — Cross-Model Second Opinion (Google Antigravity CLI agy)
Wraps the Antigravity CLI (agy) to get an independent, brutally honest second opinion from a
different AI vendor. Same usage and logic as /codex, but routed through Google's agy instead
of OpenAI Codex — useful for cross-model agreement checks where two vendors disagreeing is itself
signal.
Why
agyand notgemini? Google is discontinuing the standalone Gemini CLI for consumer tiers (2026-06-18 cutover) and replacing it with the Antigravity CLI (agy). This skill is namedgemini(muscle memory +agystill typically runs a gemini-family model) but invokes theagybinary.agyis NOT a drop-in for the oldgeminiCLI — its flag surface and output format differ; this skill is written against the real surface, not against the old one.
agy is the outside voice: direct, technically precise, challenges assumptions, catches things a
same-vendor reviewer shares blind spots on. Present its output verbatim, not summarized.
Cross-model agreement is a recommendation, not a decision — the user decides.
Announce: "I'm using the gemini skill to get a cross-model second opinion (via agy)."
Ground-truth discipline (read before editing this skill)
The only authoritative source for agy's CLI surface is agy --help. Three other sources were
checked during this skill's authoring and all proved unreliable:
- Third-party migration blogs — contradict each other and hallucinate flags (e.g.
--output-format, which does not exist). - Official docs (
antigravity.google/docs/cli-*) — JavaScript-rendered; fetching returns the page title only. - Asking
agyitself ("what are your headless flags?") — hallucinated nearly every flag (--non-interactive,--json,--model,--read-only,--resume), none of which exist.
If you change a flag below, verify it against agy --help on the installed binary first. Do NOT
trust docs, blogs, or the model's self-report.
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.
- 7d ago First seen · 456 lines · 63 tokens per session scan A 2aa2c28f3e2c
gemini is a skill published in the GitHub repository iamcxa/kc-claude-plugins (3 stars, last pushed yesterday), licensed MIT. It adds 63 tokens to every session and 6,264 once invoked, about $0.0003 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 2026-09-03.
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