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 arcasilesgroup/ai-engineering --skill ai-securitygit clone --depth 1 https://github.com/arcasilesgroup/ai-engineeringWrote 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/arcasilesgroup/ai-engineering/ai-security)<a href="https://agentmods.dev/skills/arcasilesgroup/ai-engineering/ai-security"><img src="https://agentmods.dev/badge/skills/arcasilesgroup/ai-engineering/ai-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/arcasilesgroup/ai-engineering/ai-security"><img src="https://agentmods.dev/badge/skills/arcasilesgroup/ai-engineering/ai-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 | $0.00158 | $0.03235 |
| Opus 5.5 | $0.00063 | $0.01294 |
| Sonnet 5.5 | $0.00032 | $0.00647 |
| Haiku 4.5 | $0.00016 | $0.00324 |
Grade A, and why
ai-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 19d 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 — 166 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ai-security — six-phase security audit with adversarial validation
You are a security auditor. Your job is to find exploitable vulnerabilities with real impact.
Platform terminology
This skill is agent-neutral. In the methodology:
- Task tool means the coding agent's delegation or sub-agent mechanism.
researchagent means a delegated agent optimized for focused codebase exploration and factual verification.generalagent means a delegated agent that can investigate broadly and spawn focused research agents.subagent_typemeans the equivalent delegated-agent role supported by the current platform.
Use the platform's equivalent capabilities while preserving the specified roles, parallelism, prompts, and independence boundaries.
Setup
Before starting, establish two paths:
- Target: the codebase to audit (from the user's request or the current working directory)
- Output directory: where all audit artifacts go. Ask the user if not specified, or default to
.ai-engineering/security/run-Nwhere N is the next unused integer (check what exists withls). Create it if it doesn't exist. This ensures multiple runs against the same repo produce separate results.
All files written during the audit go in the output directory:
architecture.md— Phase 1 output, fed into Phase 2 agent promptsREPORT.md— human-readable report (Phase 4)FINDINGS-DETAIL.md— detailed data flows for MEDIUM+ findings (Phase 4)findings.json— machine-readable structured output (Phase 5)
Subagents (Phases 1, 2, 3, 6) do NOT write files — they return results to you via the Task tool. You are responsible for writing all files to the output directory.
Coverage and prior runs
Each audit run explores different code paths depending on which agents find what and where they dig. No single run finds everything. Testing shows the best single run finds roughly half the total vulnerabilities across multiple runs.
If prior runs exist for the same repo (check .ai-engineering/security/ for the other run-N directories), read their findings.json files before starting Phase 2. Use them to:
- Skip known findings — don't waste agents re-discovering the same status bypass.
dispositionis the ledger's other half: a finding markedfixedis closed, anopenone is live ground. Mention prior findings in the report but focus hunting effort on new ground. - Target gaps — if prior runs focused heavily on injection and auth, weight this run toward business logic, creative attacks, and the wildcard agent. If prior runs missed public endpoints, focus there.
- Resolve disagreements — if prior runs gave conflicting verdicts on the same finding, validate it definitively.
What ships with it
10 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.
- references/AI-AND-LLM.md 11 KB
- references/ATTACK-CLASSES.md 14 KB
- references/CLIENT-SIDE.md 8.5 KB
- references/HUNTING.md 6.4 KB
- references/MEMORY-SAFETY-AND-BINARY.md 8.1 KB
- references/RECONNAISSANCE.md 3.3 KB
- references/report-schema.json 9.6 KB
- references/validate-findings.cjs 6.6 KB runs code
- references/VALIDATION-AND-REPORTING.md 9.1 KB
- references/WEB-PROTOCOL-AND-AUTH.md 14 KB
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.
- 19d ago Changed · +2 lines 56dfe2a6feb4
- 27d ago Changed · -1 lines d8488982dd6a
- 1mo ago Changed · +13 lines 7957e8dfb691
- 1mo ago Changed · +4 lines 8e496ed5cf64
- 1mo ago Changed · +55 lines · +19 tokens per session 9d5f01a8963f
- 1mo ago First seen · 93 lines · 139 tokens per session scan A 030ff02c7125
ai-security is a skill published in the GitHub repository arcasilesgroup/ai-engineering (61 stars, last pushed 5d ago), licensed Apache-2.0. It adds 158 tokens to every session and 3,235 once invoked, 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 2026-08-30.
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