ClaudSkills / Security / malware-analysis

Janitor Security

Q: What is a Claude Code skill and how does the Janitor Security skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Janitor Security is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: malware-analysis · Last updated: 2026-08-03

Heuristic security scan of installed skills — prompt-injection phrases, hidden unicode instructions, credential-store access, network-pipe-to-shell and payload-smuggling patterns. Use when the user asks 'are my skills safe', wants to scan skills for prompt injection or malware patterns, or before trusting a newly installed skill. Trigger with '/janitor-security'.

Security CStatic scan: some findings — review before installHow grading works ›

About this skill (catalog notes)

Janitor Security includes a dedicated installation section; worked examples; at least one code block. The SKILL.md runs to about 612 words, in the catalog's typical mid-range.

License: MIT
Original author: Krzysztof Hendzel <[email protected]>
Indexed lastmod: 2026-08-03
Catalog position: Security · malware-analysis
Indexed related skills: 10

How Janitor Security fits the catalog

Janitor Security sits in the Security category under the malware-analysis sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

Is Janitor Security safe to install?

A free static scan flagged 3 of ten categories (filesystem, prompt-injection, supply-chain), including a high-severity pattern. Read the security scan below before installing — a pattern inside a code fence is weighted as an example, not an instruction.

Installing & verifying

Installing Janitor Security writes its SKILL.md to ~/.claude/skills/janitor-security/SKILL.md; Claude Code discovers it automatically on the next session — no restart flag needed. It declares no allowed-tools restriction, so it inherits your session’s existing tool access rather than narrowing it. To confirm it loaded, ask Claude to list its available skills — janitor-security should appear by name.

What Janitor Security needs to run

Prerequisites: Ships its own installation / prerequisites section — it isn’t purely self-contained; read that first.
Worked code: 1 copy-paste code block in the body.
Depth: ~612 words, typical mid-range depth.

When to reach for it

There are 10 related skills in Security — a two-minute scan of the alternatives usually confirms whether Janitor Security is the right pick.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

Heuristic scan of skill content for prompt-injection and malicious patterns.

What this skill does

Janitor Security is a community-contributed Claude Code skill in the malware-analysis sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/janitor-security/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user asks 'are my skills safe', wants to scan skills for prompt injection or malware patterns, or before trusting a newly installed skill. Trigger with '/janitor-security'.

Who uses this skill

The Janitor Security Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 178,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/janitor-security
curl -L https://claudskills.com/skills/janitor-security/SKILL.md \
  -o ~/.claude/skills/janitor-security/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/janitor-security/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/janitor-security/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\janitor-security\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Janitor Security Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/janitor-security/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Janitor Security skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Janitor Security skill?

Use Janitor Security when your Claude Code task falls under the Security category — specifically in the malware analysis area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Janitor Security" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Janitor Security skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Janitor Security is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/khendzel/skills-janitor/blob/HEAD/skills/janitor-security/SKILL.md
License: MIT
Author: Krzysztof Hendzel <[email protected]>

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

Krzysztof Hendzel <[email protected]>. (2026). Janitor Security [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/janitor-security/

BibTeX

@misc{janitor-security-2026,
  author    = {Krzysztof Hendzel <[email protected]>},
  title     = {Janitor Security [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/janitor-security/}
}

Embed this skill

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Badge

[![ClaudSkills](https://claudskills.com/badge/janitor-security.svg)](https://claudskills.com/skills/janitor-security/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade C · scanned 2026-08-08 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 3 of 10 categories (filesystem, prompt-injection, supply-chain), including a high-severity pattern. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

⚠ Prompt injection
✓ Data exfiltration
⚠ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
⚠ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: C](https://img.shields.io/badge/Security-C-b8860b)](https://claudskills.com/skills/janitor-security/#security)

More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills

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