Borrowing it
Nothing to install: this file belongs to cerbos/skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/cerbos/skills/main/GEMINI.mdgit clone --depth 1 https://github.com/cerbos/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/instructions/cerbos/skills/gemini-md)<a href="https://agentmods.dev/instructions/cerbos/skills/gemini-md"><img src="https://agentmods.dev/badge/instructions/cerbos/skills/gemini-md/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/instructions/cerbos/skills/gemini-md"><img src="https://agentmods.dev/badge/instructions/cerbos/skills/gemini-md.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 | $0.00151 | $0.00151 |
| Opus 5.5 | $0.00060 | $0.00060 |
| Sonnet 5.5 | $0.00030 | $0.00030 |
| Haiku 4.5 | $0.00015 | $0.00015 |
Grade A, and why
skills GEMINI.md 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 4d 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.
What it actually says
Cerbos skills
These skills build authorization with Cerbos. Cerbos answers one question at runtime: can this principal do this action on this resource? The rules live in policy files, so changing who can do what is a policy change rather than a release.
When a request is about who can access what, load the cerbos skill first, even if the user never names Cerbos. It maps the need onto the right Cerbos component and hands off to the skill that implements it. Load another cerbos-* skill directly only when the request already names its job, such as fixing a failing policy test.
Each skill links to docs.cerbos.dev for configuration details. Check the docs rather than guessing flags or field names.
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.
- 4d ago First seen · 8 lines · 151 tokens per session scan A 6662d39fa057
skills GEMINI.md is an instructions file published in the GitHub repository cerbos/skills (4 stars, last pushed 5d ago), licensed Apache-2.0. It adds 151 tokens to every session, about $0.0006 per session on Opus 5.5. 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 2026-10-14.
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