NIST SP 800-53 AI Audit Evidence: What an Assessor Reads Before the COSAiS Overlays Land
NIST SP 800-53 Revision 5 organises its catalogue into 20 control families, and the COSAiS project launched in July 2025 to build AI-specific overlays on top of them. The overlays are still in draft, with an annotated outline for predictive AI published on 8 January 2026. This walks the evidence artifacts an assessor already asks for under the AU, IA, AC, SC, SI, and SR families once AI traffic is in a system boundary, ahead of any overlay being finalised.