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 jointly published "Careful Adoption of Agentic AI Services." This is the first coordinated multi-government security guidance specifically addressing agentic AI systems. The guidance identifies five risk classes: privilege, design and configuration, behavioral, structural, and accountability. It opens with the observation that "Agentic artificial intelligence (AI) systems increasingly operate across critical infrastructure and defense sectors and support mission-critical capabilities" (CISA).
The market context the guidance enters 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 (Digital Applied). Analysis of 18,470 production agent configurations found 98.9% lack deny rules entirely (Arun Baby).
Every risk class identified in the Five Eyes joint guidance maps to specific MYTHOS Playbook chapters. Privilege risks map to Part II (Architecture, Chapters 4-12) with patent-form least-privilege architecture. Design and configuration risks map to Part II and Part VI (Deployment, Chapters 30-34) plus Appendix G's vendor RFP language library. Behavioral risks map to Part III (Vectors, Chapters 13-19) and Part IV (Frameworks, Chapters 20-25) with statistical detection methodology. Structural risks map to Chapter 8's 8-2-8 compositional safety model, Part V (SOC/Detection/Operations), and Appendix C's 119-cell framework cross-walk. Accountability risks map to Appendix F's GTID hash-chained audit sample, Chapter 31 on non-human identity governance, Chapter 22's Crumpton 5/5 methodology, and Appendix B's Clopper-Pearson worksheet.
The Five Eyes guidance describes the WHAT at policy level. The MYTHOS Playbook describes the HOW at chapter depth. It provides 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% (Appendix B), and a cross-walk matrix mapping all Five Eyes risk classes against NIST AI RMF, OWASP LLM Top 10, OWASP Agentic Top 10, CRI FS AI RMF, and MITRE ATLAS (Appendix C).
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."
The manuscript was structurally complete before the Five Eyes guidance was published, with zero retrofit required. This convergence independently validates the risk taxonomy. The Playbook is built on a foundation of 55 patents and SecureAgent, VectorCertain's AI Agent Security governance platform, which has logged 14,208 internal trials with zero failures and a false-positive rate of 1 in 160,000.
The MYTHOS Playbook completes its 17-sprint manuscript-prep cycle and proceeds to June 2026 publication. The first companion volume, After MYTHOS: The C-Suite and Board Volume, will follow in Q2 2027.
