skill-security-audit

skill-security-audit is a skill for Claude Code, Codex from agulli/atlas-agents. It costs 54 tokens per session (768 once invoked), scanned C, original, no licence file.

A security review process for an agent's skill library. A skill library is a collection of instruction files that control how an agent handles specific tasks.

In plain words
What is it for?
It reviews skill files for security problems and prompt injection, which is text designed to make an agent ignore its intended instructions.
Why use it?
It helps identify malicious, incorrectly configured, or untrusted instructions before they affect the agent.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit It reviews skill files for security problems and prompt injection, which is text designed to make an agent ignore its intended instructions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/agulli/atlas-agents/skill-security-audit
Install

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.

Any agent
npx skills add agulli/atlas-agents --skill skill-security-audit
Clone the repo
git clone --depth 1 https://github.com/agulli/atlas-agents

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for skill-security-audit

README.md
[![agentmods](https://agentmods.dev/badge/skills/agulli/atlas-agents/skill-security-audit/github.svg)](https://agentmods.dev/skills/agulli/atlas-agents/skill-security-audit)
Your own site
<a href="https://agentmods.dev/skills/agulli/atlas-agents/skill-security-audit"><img src="https://agentmods.dev/badge/skills/agulli/atlas-agents/skill-security-audit/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.

agentmods 80×15 button for skill-security-audit

Your own site · 80×15
<a href="https://agentmods.dev/skills/agulli/atlas-agents/skill-security-audit"><img src="https://agentmods.dev/badge/skills/agulli/atlas-agents/skill-security-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 768 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 3 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00054 $0.00768
Opus 5 $0.00027 $0.00384
Sonnet 5 $0.00011 $0.00154
Haiku 4.5 $0.00005 $0.00077

Measured 9d ago against content hash 296affddeb1f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade C, and why

skill-security-audit scanned grade C with 3 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 9d 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.

Instruction-override phrasingmediumPrompt injection

Text telling the model to disregard its earlier instructions or safety rules is the shape of a prompt injection, whoever wrote it.

- Instruct the agent to ignore previous instructions or override safety rules

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Downloads and executes remote codemediumSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

- Contain commands like `curl | bash`, `wget | sh`, or piping to an interpreter

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- Contain commands like `curl | bash`, `wget | sh`, or piping to an interpreter
ch09_agent_skills/skills/skill-security-audit/SKILL.md · 80 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 9d ago First seen · 80 lines · 54 tokens per session scan C 296affddeb1f

Subscribe to this mod's changes

skill-security-audit is a skill published in the GitHub repository agulli/atlas-agents (500 stars, last pushed 1mo ago), with no licence file. It adds 54 tokens to every session and 768 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 3 findings (instruction-override phrasing, downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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