VectorCertain LLC today announced the completion of manuscript preparation for The MYTHOS Playbook, a 34-chapter, 9-appendix technical reference designed for CISOs, security architects, and AI governance program leads operationalizing the new joint Five Eyes guidance on agentic AI security. The book closes its 17-sprint development cycle and proceeds to June 2026 publication. A pre-order landing page is live at vectorcertain.com.
On May 1, 2026, six national cybersecurity agencies representing all five Five Eyes nations—CISA, NSA, Australia's ASD ACSC, the Canadian Centre for Cyber Security, NZ NCSC, and UK NCSC—jointly published "Careful Adoption of Agentic AI Services". It is the first coordinated multi-government security guidance addressing agentic AI systems, classifying autonomous-agent risk as a critical national infrastructure concern. The guidance identifies five risk classes: privilege, design and configuration, behavioral, structural, and accountability.
Every risk class in the Five Eyes guidance maps to specific MYTHOS Playbook chapters and appendices. Privilege risks are addressed in Part II Architecture (Chapters 4-12) with least-privilege architecture across MRM-CFS-SG governance gates and the AGL-SG access governance layer. Design and configuration risks are covered in Part II plus Part VI Deployment (Chapters 30-34) and Appendix G, which delivers a 12-clause vendor RFP language library. Behavioral risks are treated in Part III Vectors (Chapters 13-19) with a seven-vector behavioral threat taxonomy and Part IV Frameworks (Chapters 20-25) with statistical detection methodology. Structural risks are addressed in Chapter 8's 8-2-8 compositional safety model, Part V SOC/Detection (Chapters 26-29), and Appendix C's 119-cell framework cross-walk matrix mapping to NIST AI RMF, OWASP LLM Top 10, OWASP Agentic Top 10, CRI FS AI RMF, and MITRE ATLAS. Accountability risks are covered in Appendix F's GTID hash-chained audit record sample, Chapter 31's NHI governance, Chapter 22's Crumpton 5/5 disclosure methodology, and Appendix B's Clopper-Pearson exact binomial confidence interval worksheet.
The Playbook goes beyond the Five Eyes guidance by providing vendor RFP language (Appendix G), statistical detection methodology validated across 7,000 adversarial scenarios with 100% recall and a 3-sigma lower bound of ≥99.65% at 99.7% confidence using the Clopper-Pearson method, and complete architectural patterns including a 5-layer governance pipeline. The manuscript was structurally complete before the Five Eyes guidance was published, with the risk taxonomy independently derived from real-world incident analysis. This convergence validates both documents independently.
Joseph P. Conroy, Founder and CEO of VectorCertain LLC, said: "The Five Eyes did the hard policy work—establishing that agentic AI risk is a national-security-grade concern. The MYTHOS Playbook is the operational complement: the technical reference a CISO can hand to a security architect. We didn't write a book about the Five Eyes guidance—we wrote a book about the underlying threat landscape, and the Five Eyes published guidance arrived at the same risk taxonomy independently."
