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Principle Security

Category: Security  ·  Sub-category: web-security  ·  Last updated:
Security design principles — trust boundaries and input validation, authentication vs authorization, secrets handling, secure defaults and defense in depth, lightweight threat modeling, cryptography hygiene, attack-surface minimization. Auto-load when designing auth, discussing authn or authz, handling secrets, defining trust boundaries, validating untrusted input, considering SSRF or CSRF, choosing session or JWT mechanics, configuring TLS, picking an encryption primitive, or weighing least-privilege trade-offs.

From the source SKILL.md

Security bugs are design bugs. They are cheapest to fix before the first line of code is written. This skill teaches the principles that prevent security bugs at design time; the security-auditor subagent audits the resulting diff against vulnerability categories, secret patterns, and language foot-guns post-implementation.

What this skill does

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

Who uses this skill

The Principle 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 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/principle-security
curl -L https://claudskills.com/skills/principle-security/SKILL.md \
  -o ~/.claude/skills/principle-security/SKILL.md

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

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

Telegram

📱 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 Principle Security Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/principle-security/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Principle Security skill do?
Security design principles — trust boundaries and input validation, authentication vs authorization, secrets handling, secure defaults and defense in depth, lightweight threat modeling, cryptography hygiene, attack-surface minimization. Auto-load when designing auth, discussing authn or authz, handling secrets, defining trust boundaries, validating untrusted input, considering SSRF or CSRF, choosing session or JWT mechanics, configuring TLS, picking an encryption primitive, or weighing least-privilege trade-offs.
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 Principle Security skill?
Use Principle Security when your Claude Code task falls under the Security category — specifically in the web security 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 Principle 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 Principle 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. Principle 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

Cite this skill

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

APA
lugassawan. (2026). Principle Security [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/principle-security/
BibTeX
@misc{principle-security-2026,
  author    = {lugassawan},
  title     = {Principle Security [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/principle-security/}
}

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