OAS defines a multidimensional architecture model for compute systems: - 6 canonical dimensions: Stack, Logic, Plane, Quality, Capability, Intelligence - VSM (Viable System Model) tagging throughout - Canonical element types and 9 relation types - Intelligence dimension I1-I5 with governance constraint: I5 agents MUST operate through the control plane (P3 — directly governs Custodian design) Schema provides two-layer validation: - Layer 1: JSON Schema 2020-12 structural validation - Layer 2: semantic rule profile R1-R16 (placement, governance, intelligence coupling, relation typing rules) + YAML machine-readable rule block - Draft and production validation profiles Terminology and dimensions will guide state-hub and Custodian implementation. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>