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 today and proceeds to June 2026 publication.
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.
The market context is severe. According to Bessemer Venture Partners, Gartner projects AI agents will be embedded in 40% of enterprise applications by the end of 2026, up from less than 5% in 2025. Digital Applied reports 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. AGAT Software found 88% of organizations report agent-related security incidents.
Every risk class identified in the Five Eyes guidance maps to specific MYTHOS Playbook chapters and appendices. Privilege risks are covered in Part II Architecture with patent-form least-privilege architecture. Design and configuration risks map to Part II and Part VI Deployment, including a 12-clause vendor RFP language library in Appendix G. Behavioral risks are addressed in Part III Vectors with a seven-vector behavioral threat taxonomy and Part IV Frameworks with statistical detection methodology. Structural risks map to the 8-2-8 compositional safety model and Part V SOC/Detection. Accountability risks are covered with hash-chained audit records in Appendix F, non-human-identity governance, and the Crumpton 5/5 disclosure methodology.
The Playbook's detection methodology rests on Clopper-Pearson exact binomial confidence intervals computed across 7,000 MYTHOS adversarial scenarios with 100% recall and a 3-sigma lower bound of ≥99.65% at 99.7% confidence. Appendix C provides 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.
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 Playbook manuscript was structurally complete before the Five Eyes guidance was published, with the risk taxonomy derived independently from real-world incident analysis. This convergence means the Playbook is not merely aligned with the guidance but provides independent operational validation of the risk model.
The MYTHOS Playbook is available for pre-order at vectorcertain.com.
