mcsb
Microsoft Cloud Security Benchmark — Skill Entry
This SKILL.md is the entrypoint for the Microsoft Cloud Security Benchmark (MCSB) skill.
The skill encodes the durable, structurally stable layer of MCSB — the control-domain taxonomy and a domain-grain crosswalk to NIST SP 800-53 and CIS Controls — so the Security Planner and Security Reviewer can map and assess Azure cloud resources against a consistent control vocabulary.
The skill deliberately does not embed the volatile layer of MCSB (per-Azure-service security baselines, per-service control IDs, Azure Policy mappings, and Defender for Cloud assessment specifics). That content changes on Microsoft's release cadence and is retrieved at runtime through the Researcher Subagent per references/lookup-playbook.md.
Version and stability
This skill targets MCSB v2, which Microsoft marks as preview and which supersedes MCSB v1. Content is version-pinned and retrieval-dated (2026-07-21). MCSB v2 replaces v1's Governance and Strategy (GS) domain with an Artificial Intelligence Security (AI) domain, and maps to NIST SP 800-53 Rev. 5 and CIS Controls v8.1 (v1 mapped to Rev. 4 and CIS v8). Re-verify the taxonomy and mappings against the official source before relying on them for a compliance decision.