VectorCertain LLC today announced the completion of manuscript-prep 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 today 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" (CISA). This is the first coordinated multi-government security guidance specifically addressing agentic AI systems, moving autonomous-agent risk from "emerging vendor problem" to "critical national infrastructure" classification. The guidance identifies five risk classes: privilege, design and configuration, behavioral, structural, and accountability (Cybernews).
Every risk class identified in the Five Eyes joint guidance maps to specific MYTHOS Playbook chapters and appendices. Privilege risks map to Part II Architecture (Ch. 4-12) with patent-form least-privilege architecture. Design and configuration risks map to Part II + Part VI Deployment (Ch. 30-34) plus Appendix G's 12-clause vendor RFP language library. Behavioral risks map to Part III Vectors (Ch. 13-19) with a seven-vector behavioral threat taxonomy and Part IV Frameworks (Ch. 20-25) with statistical detection methodology. Structural risks map to Ch. 8 (8-2-8 compositional safety model) and Part V SOC/Detection (Ch. 26-29) plus Appendix C's 119-cell cross-walk. Accountability risks map to Appendix F GTID hash-chained audit sample, Ch. 31 NHI governance, Ch. 22 Crumpton 5/5 methodology, and Appendix B Clopper-Pearson worksheet.
The 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. Appendix C delivers a 119-cell cross-walk matrix mapping every Five Eyes risk class against NIST AI RMF, OWASP LLM Top 10, OWASP Agentic Top 10, CRI FS AI RMF, and MITRE ATLAS (CRI). The market context is severe: one in eight enterprise breaches now involves AI agents—a 340% year-over-year increase, with 78% of compromised agents over-permissioned (Digital Applied).
The MYTHOS Playbook manuscript was structurally complete by April 2026—before the Five Eyes joint guidance was published. Drafting started in 2025, and the 17-sprint development cycle produced ~450,000 words of technical content. The Playbook's 7-vector behavioral risk taxonomy was independently derived from real-world incident analysis, including documented cases such as the 698 AI deception incidents catalogued in CLTR's "Scheming in the Wild" report (CLTR 2026). When the Five Eyes guidance was published, its five risk classes mapped cleanly onto the Playbook's existing structural commitments. No retrofit was required.
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 MYTHOS Playbook is structured in 7 parts plus a 9-appendix reference set. The 9 appendices include a 119-cell cross-reference matrix, a 12-clause vendor RFP language library, a GTID audit sample with hash-chained tamper-evidence, and a Clopper-Pearson exact binomial confidence-interval worksheet. The book completes its publication-prep cycle today and proceeds to June 2026 publication. The first companion volume, After MYTHOS: The C-Suite and Board Volume, will follow in Q2 2027.
