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." It 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. It opens by noting that "Agentic artificial intelligence (AI) systems increasingly operate across critical infrastructure and defense sectors" and closes with explicit caution to prioritize resilience and risk containment over efficiency gains.
The market context is severe. Gartner projects AI agents will be embedded in 40% of enterprise applications by the end of 2026. 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, according to Digital Applied. 88% of organizations report agent-related security incidents. 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.
The MYTHOS Playbook fills the gap between policy-level recommendations and CISO-grade implementation. Every risk class identified in the Five Eyes guidance maps to specific chapters and appendices. For privilege risks, Part II Architecture delivers patent-form least-privilege architecture across MRM-CFS-SG governance gates and the AGL-SG access governance layer. For design and configuration risks, Part VI Deployment specifies environment segmentation, fail-safe defaults, and progressive deployment patterns, while Appendix G provides a 12-clause vendor RFP language library. For behavioral risks, Part III Vectors presents a seven-vector behavioral threat taxonomy and Part IV Frameworks includes statistical detection methodology with HOTS Homology achieving 81.4% deception-detection precision. For structural risks, Chapter 8 specifies the 8-2-8 compositional safety model for cross-component cascading-failure containment. For accountability risks, Appendix F publishes a complete GTID audit-record sample with hash-chained tamper-evidence.
The book includes a 119-cell cross-walk matrix at Appendix C 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. The detection methodology is 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 exact binomial method. Appendix B delivers the worksheet CISOs can apply to their own detection-claim portfolios.
Importantly, the MYTHOS Playbook manuscript was structurally complete before the Five Eyes guidance was published. Its risk taxonomy was independently derived from real-world incident analysis. When the Five Eyes guidance was released, its five risk classes mapped cleanly onto the Playbook's existing structural commitments—no retrofit was required. This convergence is operationally significant: the Five Eyes risk taxonomy is the policy floor, and the MYTHOS Playbook risk taxonomy is the technical floor, both derived from the same observable threat landscape.
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 book is structured in 7 parts plus 9 appendices spanning approximately 450,000 words. It is written for CISOs, security architects, AI governance program leads, vendor risk managers, regulatory and compliance teams, and SOC operators in critical-infrastructure and financial-services sectors. The companion volume "After MYTHOS: The C-Suite and Board Volume" will follow in Q2 2027.
VectorCertain LLC is a Delaware corporation headquartered in Casco, Maine, building AI Agent Security (AAS) governance technology. Its SecureAgent platform has logged 14,208 internal trials across 38 techniques and 3 adversary profiles with zero failures, achieving a false-positive rate of 1 in 160,000—53,333× below the EDR industry average. The patent portfolio includes 55 patents (21 filed USPTO) in a hub-and-spoke structure with consolidated valuation ranging from $285M to $1.55B.
