Security Core

Q: What is a Claude Code skill and how does the Security Core 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. Security Core 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: red-team · Last updated: 2026-06-05

lang:rust

Shared reference for the security cluster: the trust-boundary model (untrusted input/action → privileged sink), the defend-vs-attack × code/config/runtime surface map, severity & exploitability conventions, and the tooling matrix every security spoke shares. USE WHEN triaging a finding, judging whether something is exploitable, or deciding which control to apply — the interlocking rules behind all six spokes.

About this skill (catalog notes)

Security Core includes pricing or quota commentary; at least one code block. The SKILL.md runs to about 734 words, in the catalog's typical mid-range.

License: MIT
Original author: Sheshiyer
Indexed lastmod: 2026-06-05
Catalog position: Security · red-team
Indexed related skills: 10

How Security Core fits the catalog

Security Core sits in the Security category under the red-team 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.

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

Shared model for the security cluster. The review, hunting, scanning, and guard spokes all turn on the same one idea — keep it consistent here so no spoke contradicts another.

What this skill does

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

When to invoke it: USE WHEN triaging a finding, judging whether something is exploitable, or deciding which control to apply — the interlocking rules behind all six spokes.

Who uses this skill

The Security Core 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/security-core
curl -L https://claudskills.com/skills/security-core/SKILL.md \
  -o ~/.claude/skills/security-core/SKILL.md

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

Skills live at ~/.claude/skills/security-core/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\security-core\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 Security Core Claude Code skill?

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

What does the Security Core 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 Security Core skill?

Use Security Core when your Claude Code task falls under the Security category — specifically in the red team 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 Security Core" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Security Core 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. Security Core 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/Sheshiyer/skill-clusters/blob/HEAD/skills/security-core/SKILL.md
License: MIT
Author: Sheshiyer

Cite this skill

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

APA

Sheshiyer. (2026). Security Core [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/security-core/

BibTeX

@misc{security-core-2026,
  author    = {Sheshiyer},
  title     = {Security Core [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/security-core/}
}

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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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