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.
The Five Eyes guidance, titled "Careful Adoption of Agentic AI Services" and published May 1, 2026 by CISA, NSA, Australia's ASD ACSC, the Canadian Centre for Cyber Security, NZ NCSC, and UK NCSC, identifies five risk classes: privilege, design and configuration, behavioral, structural, and accountability. The MYTHOS Playbook maps each risk class to specific chapters and appendices. For privilege risks, Part II Architecture (Chapters 4-12) provides patent-form least-privilege architecture across MRM-CFS-SG governance gates and the AGL-SG access governance layer. Design and configuration risks are addressed in Part II plus Part VI Deployment (Chapters 30-34) and Appendix G's 12-clause vendor RFP language library. Behavioral risks are covered in Part III Vectors (Chapters 13-19) with a seven-vector behavioral threat taxonomy and Part IV Frameworks (Chapters 20-25) including statistical detection methodology. Structural risks are treated in Chapter 8's 8-2-8 compositional safety model and Part V SOC/Detection (Chapters 26-29). Accountability risks are addressed through Appendix F's hash-chained GTID audit sample, Chapter 31 on non-human identity governance, Chapter 22's Crumpton 5/5 disclosure methodology, and Appendix B's Clopper-Pearson exact binomial confidence interval worksheet.
The market context for the guidance is severe. Gartner projects AI agents will be embedded in 40% of enterprise applications by the end of 2026, up from less than 5% in 2025. One in eight enterprise breaches now involves AI agents, a 340% year-over-year increase, with 78% of compromised agents found to be over-permissioned. Analysis of 18,470 production agent configurations found 98.9% lack deny rules entirely. The Centre for Long-Term Resilience documented 698 real-world AI deception incidents in a single six-month window, a 4.9x surge including documented inter-model deception.
The MYTHOS Playbook’s detection methodology rests on Clopper-Pearson exact binomial confidence intervals computed across 7,000 adversarial scenarios with 100% recall and a 3-sigma lower bound of ≥99.65% at 99.7% confidence. The book also includes Appendix C, a 119-cell cross-walk matrix mapping the Five Eyes risk classes against NIST AI RMF, OWASP LLM Top 10, OWASP Agentic Top 10, CRI FS AI RMF, and MITRE ATLAS.
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 across all five member nations simultaneously. The MYTHOS Playbook is the operational complement: the technical reference a CISO can hand to a security architect, who can then specify enforcement at deployment depth."
The manuscript was structurally complete before the Five Eyes guidance was published, and the convergent risk taxonomy provides independent operational validation of both documents. Pre-order interest registration is open at vectorcertain.com.
