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Penthera

Category: Security  ·  Sub-category: forensics  ·  Last updated:
lang:python
Offline cyber security agent for the user's own apps and AI coding tools, run locally with the Penthera CLI; open R&D, measured in public. Sets it up in one command ("set up penthera in this repo"). Scans the user's own live URL and repo (TLS, headers, auth, OpenAPI, secrets incl. AI keys, opt-in injection); checks npm and Python dependencies offline ("is this dependency safe?", "what changed in my deps?", "install X safely", "any AGPL in our deps?"); blocks secrets and risky agent config before commit ("add a pre-commit hook"); audits AI tooling ("audit my MCP servers / skills / hooks", "check this skill before I install it"); fixes findings on a local branch and re-scans to verify ("scan and fix my app"); writes reports and evidence ("report for my auditor / manager", NIS2, SARIF, baseline diff). Use when the user asks to scan, audit, harden, fix, or review the security of their own app, staging URL, localhost, repo, dependencies, or agent setup. Do NOT use for targets without explicit authorization.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Lightweight security scanner for URLs, local repos, and (macOS) machine audits. Always run the authorization gate before any scan.

What this skill does

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

When to invoke it: Use when the user asks to scan, audit, harden, fix, or review the security of their own app, staging URL, localhost, repo, dependencies, or agent setup. Do NOT use for targets without explicit authorization.

Who uses this skill

The Penthera 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 213,000+ 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/penthera
curl -L https://claudskills.com/skills/penthera/SKILL.md \
  -o ~/.claude/skills/penthera/SKILL.md

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

Skills live at ~/.claude/skills/penthera/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\penthera\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 Penthera Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/penthera/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Penthera skill do?
Offline cyber security agent for the user's own apps and AI coding tools, run locally with the Penthera CLI; open R&D, measured in public. Sets it up in one command ("set up penthera in this repo"). Scans the user's own live URL and repo (TLS, headers, auth, OpenAPI, secrets incl. AI keys, opt-in injection); checks npm and Python dependencies offline ("is this dependency safe?", "what changed in my deps?", "install X safely", "any AGPL in our deps?"); blocks secrets and risky agent config before commit ("add a pre-commit hook"); audits AI tooling ("audit my MCP servers / skills / hooks", "check this skill before I install it"); fixes findings on a local branch and re-scans to verify ("scan and fix my app"); writes reports and evidence ("report for my auditor / manager", NIS2, SARIF, baseline diff). Use when the user asks to scan, audit, harden, fix, or review the security of their own app, staging URL, localhost, repo, dependencies, or agent setup. Do NOT use for targets without explicit authorization.
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 Penthera skill?
Use Penthera when your Claude Code task falls under the Security category — specifically in the forensics 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 Penthera" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Penthera 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. Penthera 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
danoszz. (2026). Penthera [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/penthera/
BibTeX
@misc{penthera-2026,
  author    = {danoszz},
  title     = {Penthera [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/penthera/}
}

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Security scan

Grade A · scanned 2026-11-01 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (network), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/penthera/#security)

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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
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

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