Anthropic Cybersecurity Skills

Anthropic Cybersecurity Skills is the largest open-source cybersecurity skills library for AI agents, containing 754 production-grade skills spanning 26 security domains. Every skill follows the agentskills.io standard with YAML frontmatter for fast discovery and structured Markdown for step-by-step execution. The library provides unified cross-framework coverage across MITRE ATT&CK v18, NIST CSF 2.0, MITRE ATLAS v5.4, MITRE D3FEND v1.3, and NIST AI RMF 1.0 — the only open-source skills library to map every skill to all five frameworks.

Key features include:

• 754 production-grade skills across 26 security domains including Cloud Security, Threat Hunting, Malware Analysis, Incident Response, Penetration Testing, and more
• Five-framework mapping covering MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, MITRE D3FEND, and NIST AI RMF in every skill
• Progressive disclosure architecture where each skill costs ~30 tokens to scan (frontmatter) and 500–2,000 tokens to fully load, enabling agents to search all 754 skills without blowing context windows
• Structured skill anatomy with SKILL.md, references (standards + workflows), scripts, and asset templates per skill directory
• 26+ compatible AI platforms including Claude Code, GitHub Copilot, Cursor, OpenAI Codex CLI, Gemini CLI, LangChain, CrewAI, AutoGen, and any agentskills.io-compatible agent
• Quick start via npx — run npx skills add mukul975/Anthropic-Cybersecurity-Skills or clone the repo directly to get started immediately
• Apache 2.0 license allowing free use, modification, and distribution in personal and commercial projects
• Community-driven contributions with PRs reviewed for technical accuracy and agentskills.io compliance within 48 hours