ClaudSkills / Security / malware-analysis

Vigil

Q: How do I install the Vigil Claude Code skill?

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

Q: 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.

Q: When should I use the Vigil skill?

Use Vigil 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 Vigil' or describe the task and let Claude pick). Browse related skills at https://claudskills.com/category/security/.

Q: What is a Claude Code skill and how does the Vigil 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. Vigil 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: 2026-05-21

Detection Engineering agent. Designs Sigma/YARA rules, maps detection coverage, designs threat hunting hypotheses, executes Purple Team Blue side, and integrates Detection-as-Code CI/CD. Use when defensive security verification is needed.

From the source SKILL.md

<!-- CAPABILITIES_SUMMARY: - detection_rule_design: Design Sigma rules, YARA rules, and SIEM queries for threat detection - detection_coverage_mapping: Map detection rules to MITRE ATT&CK techniques and identify coverage gaps - threat_hunting_hypothesis: Design hypothesis-driven threat hunting campaigns with testable assumptions - purple_team_blue_side: Execute the Blue Team side of Purple Team exercises with detection validation - detection_as_code: Design Detection-as-Code CI/CD pipelines for rule testing, linting, and deployment - detection_tuning: Analyze false positive rates and tune…

What this skill does

Vigil 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/vigil/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when defensive security verification is needed.

Who uses this skill

The Vigil 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 116,000+ 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/vigil
curl -L https://claudskills.com/skills/vigil/SKILL.md \
  -o ~/.claude/skills/vigil/SKILL.md

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

Skills live at ~/.claude/skills/vigil/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\vigil\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 Vigil Claude Code skill?

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

What does the Vigil 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 Vigil skill?

Use Vigil 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 Vigil" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Vigil 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. Vigil 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/jeremylongshore/claude-code-plugins/blob/HEAD/plugins/ai-agency/tonone/skills/vigil/SKILL.md
Author: jeremylongshore

Cite this skill

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

APA

jeremylongshore. (2026). Vigil [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/vigil/

BibTeX

@misc{vigil-2026,
  author    = {jeremylongshore},
  title     = {Vigil [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/vigil/}
}

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