What is security-audit?

A security-audit skill for examining the mutsu interpreter for security problems, including unsafe execution, memory handling, resource limits, and file or cache behavior.

Use it to review interpreter security, module search paths, caches, recursion and allocation limits, file descriptors, and related runtime behavior.

It helps identify risks at trust boundaries and in code that processes untrusted input before those risks become vulnerabilities.

How tokuhirom/mutsu configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to tokuhirom/mutsu. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/tokuhirom/mutsu/main/.agents/skills/security-audit/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/tokuhirom/mutsu

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/tokuhirom/mutsu/security-audit/github.svg)](https://agentmods.dev/skills/tokuhirom/mutsu/security-audit)

Your own site

<a href="https://agentmods.dev/skills/tokuhirom/mutsu/security-audit"><img src="https://agentmods.dev/badge/skills/tokuhirom/mutsu/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/tokuhirom/mutsu/security-audit"><img src="https://agentmods.dev/badge/skills/tokuhirom/mutsu/security-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 107 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,255 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 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.

Model	Per session	Once invoked
Fable 5.1	$0.00107	$0.02255
Opus 5.5	$0.00043	$0.00902
Sonnet 5.5	$0.00021	$0.00451
Haiku 4.5	$0.00011	$0.00226

Measured 13d ago against content hash 6babe7dbfeb2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

security-audit 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 13d 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.

.agents/skills/security-audit/SKILL.md · 128 lines

The source is not reproduced here

Licensed Artistic-2.0

The repository is licensed Artistic-2.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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.

13d ago Changed · +6 lines 6babe7dbfeb2
1mo ago First seen · 122 lines · 107 tokens per session scan A bc04a9192ac9

Subscribe to this mod's changes

security-audit is a skill published in the GitHub repository tokuhirom/mutsu (30 stars, last pushed today), licensed Artistic-2.0. It adds 107 tokens to every session and 2,255 once invoked, about $0.0004 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 2026-10-03.