Protect the root user of every AWS account with strong MFA, no programmatic access keys, monitored email and contact details, and use root only for tasks that explicitly require it.
AWS Well-Architected Security Pillar SEC01-BP02 is one control. If you already hold one of the frameworks below, a reviewed crosswalk already says how much of AWS Well-Architected Security Pillar your existing evidence covers. Hold NIST SP 800-53 Rev 5 and 52 of 63 AWS Well-Architected Security Pillar controls already carry evidence.
Each report names every control your existing framework evidences, every one it does not, the reasoning behind each claim, and the claims that were argued against and rejected. 0 were rejected on the NIST SP 800-53 Rev 5 pair alone.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.