Borrowing it
Nothing to install: this file belongs to briiirussell/cybersecurity-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/briiirussell/cybersecurity-skills/main/CLAUDE.mdgit clone --depth 1 https://github.com/briiirussell/cybersecurity-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/briiirussell/cybersecurity-skills/claude-md)<a href="https://agentmods.dev/instructions/briiirussell/cybersecurity-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/briiirussell/cybersecurity-skills/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/briiirussell/cybersecurity-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/briiirussell/cybersecurity-skills/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00699 | $0.00699 |
| Opus 5 | $0.00349 | $0.00349 |
| Sonnet 5 | $0.00140 | $0.00140 |
| Haiku 4.5 | $0.00070 | $0.00070 |
Grade A, and why
cybersecurity-skills CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
Project Overview
Cybersecurity Skills is a collection of cybersecurity skill prompts for AI coding agents. Skills are authored as Claude Code SKILL.md files (the canonical format) and adapted for Cursor and Codex via a build script.
Supported Agents
| Agent | Format | Location |
|---|---|---|
| Claude Code | SKILL.md (canonical) |
skills/<skill-name>/SKILL.md — copy to .claude/skills/ |
| Cursor | .mdc rule files |
adapters/cursor/ |
| Codex | Instruction .md |
adapters/codex/ |
Directory Structure
skills/
├── recon/SKILL.md
├── owasp-audit/SKILL.md
├── disk-forensics/SKILL.md
├── osint-recon/SKILL.md
├── incident-triage/SKILL.md
└── cloud-audit/SKILL.md
adapters/
├── cursor/ # Generated .mdc files
└── codex/ # Generated .md files
templates/
└── skill-template.md
scripts/
└── build-adapters.mjs
Skill Format (Claude Code SKILL.md)
Every skill follows the Anthropic skill creator guidelines:
---
name: skill-name # Lowercase, hyphens, max 64 chars
description: "What it does and when to use it. 200-1024 chars. Include trigger phrases."
allowed-tools: Bash, Read, Write # Tools the skill can use
---
Frontmatter fields:
name— Slug used for/skill-nameinvocation. Lowercase + hyphens only.description— Explains WHAT the skill does and WHEN to use it. Claude uses this to decide automatic invocation. Be "pushy" to combat undertriggering.allowed-tools— Comma-separated list of tools the skill can access.disable-model-invocation— Settruefor manual-only skills (e.g., deploy).user-invocable— Setfalsefor background knowledge only.
Content guidelines:
- Use imperative form ("Run this command", "Check for X")
- Keep SKILL.md under 500 lines
- Move reference material to separate files if needed
- Define output formats explicitly
Build Commands
node scripts/build-adapters.mjs # Generate Cursor + Codex adapters from SKILL.md files
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 79 lines · 699 tokens per session scan A c1ffbb2c6848
cybersecurity-skills CLAUDE.md is an instructions file published in the GitHub repository briiirussell/cybersecurity-skills (387 stars, last pushed 3mo ago), licensed MIT. It adds 699 tokens to every session, about $0.0035 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).