mukul975/Anthropic-Cybersecurity-Skills is a community-built skill bundle that publishes 754 structured cybersecurity skills as agentskills.io-standard SKILL.md instruction packs. Each skill is mapped against five canonical frameworks — MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, and NIST AI RMF — providing direct traceability from a runtime action to a recognized control or technique. The bundle works across Claude Code, GitHub Copilot, Codex, Cursor, and other agent harnesses that load skills at runtime. The repo entered GitHub trending on May 25 2026 with +999 stars in a 24-hour window (9K stars total), riding the convergence of (a) Pope Leo XIV's Magnifica Humanitas encyclical on AI governance the same day and (b) Microsoft's release of the agent-governance-toolkit covering 10/10 OWASP Agentic Top 10. It is one of the four Skills-targeted repos on the top trending board today, alongside multica-ai/andrej-karpathy-skills, affaan-m/ECC, and multica-ai/multica.
mukul975/Anthropic-Cybersecurity-Skills is the largest community-built cybersecurity skill bundle for AI agents to date. 754 SKILL.md packs, each cross-referenced to canonical control frameworks, distributed as a single repository that any skill-loading harness can install.
The repo crossed 9K stars on the same day Pope Leo XIV’s Magnifica Humanitas encyclical landed and Microsoft’s agent-governance-toolkit sat alongside it on the trending board. The market signal is that every skill-loading harness needs a security-skills bundle within reach, and this one has the framework mappings the compliance auditors will want.
Security operations teams use it as the runtime skill library for incident-response agents (Detect/Respond TTPs), purple-team exercise scripting (ATT&CK + D3FEND pairs), and EU AI Act / Colorado AI Act compliance evidence collection (NIST AI RMF mappings). The August 2026 EU AI Act high-risk obligations and June 2026 Colorado deadline make the framework traceability immediately load-bearing.
Loads in any harness that supports the agentskills.io SKILL.md standard — Claude Code, GitHub Copilot, OpenAI Codex CLI, Cursor, and others. Pair with the Microsoft Agent Governance Toolkit for OWASP Agentic Top 10 runtime enforcement on top of the skill traceability.
AI agents that work well with Anthropic Cybersecurity Skills.
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