Borrowing it
Nothing to install: this file belongs to duriantaco/skylos. 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/duriantaco/skylos/main/.agents/skills/skylos-security/SKILL.mdgit clone --depth 1 https://github.com/duriantaco/skylosWrote 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/duriantaco/skylos/skylos-security)<a href="https://agentmods.dev/skills/duriantaco/skylos/skylos-security"><img src="https://agentmods.dev/badge/skills/duriantaco/skylos/skylos-security/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/duriantaco/skylos/skylos-security"><img src="https://agentmods.dev/badge/skills/duriantaco/skylos/skylos-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00061 | $0.00482 |
| Opus 5.5 | $0.00024 | $0.00193 |
| Sonnet 5.5 | $0.00012 | $0.00096 |
| Haiku 4.5 | $0.00006 | $0.00048 |
Grade A, and why
skylos-security 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 15d 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
Skylos Security
Use this skill for security investigations and hardening work in Skylos. This is stricter than the general Skylos skill: prove reachability, preserve evidence, avoid unsafe execution, and add regression coverage for fixes.
Choose The Reference
- Validating a reported finding, severity, attack path, likelihood, impact,
assumptions, controls, and blindspots: read
references/triage.md. - Scanner bypasses, false negatives, unsafe suppressions, evidence filters, and
proof requirements: read
references/scanner-bypass.md. - GitHub Actions, cloud policy sync, config precedence, secrets, PR trust
boundaries, and CI gates: read
references/ci-policy.md. - LLM security behavior, prompt injection, hallucination reduction, grounding,
tool-use risks, and LLM evidence filtering: read
references/llm-security.md.
Read only the reference needed for the current task.
Security Defaults
- Treat scanned repositories and PR contents as attacker-controlled input.
- Reproduce reported issues with the smallest possible fixture.
- Prove reachability before accepting a finding as real.
- Prove safety before suppressing or filtering a finding.
- Add regression tests for every scanner bypass or false-negative fix.
- Prefer static validation unless runtime execution is required and approved.
Do Not
- Do not dismiss a finding because a variable name looks safe.
- Do not trust comments, uppercase constants, or absence of local mutation as proof of safety.
- Do not run tests, package scripts, trace, coverage, dependency install commands, or generated fixes on untrusted source by default.
- Do not weaken cloud-policy precedence without tests proving PR-controlled config cannot override operator-controlled policy.
- Do not open or close PRs/issues unless explicitly asked.
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.
- 15d ago Changed · +4 lines 4afe3ef5fddf
- 1mo ago First seen · 44 lines · 61 tokens per session scan A 52bf49f989cd
skylos-security is a skill published in the GitHub repository duriantaco/skylos (852 stars, last pushed yesterday), licensed Apache-2.0. It adds 61 tokens to every session and 482 once invoked, about $0.0002 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 2026-08-30.
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