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The largest open-source cybersecurity skills library designed for AI agents. Maps 754 production-grade skills across 26 security domains to 5 major frameworks (MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF). Compatible with 26+ AI platforms including Claude Code, GitHub Copilot, Cursor, and Gemini CLI.