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CONSTABLE
ProblemDefinitionsMechanismFor teamsScopeLexiconImplementation
SDSResearch, diagnosis, and architectural work.ZTGThe open specification defining structural governance requirements.ConstableThe commercial reference implementation and control kernel.

SDS maintains the open ZTG specification and builds Constable as a reference implementation. ZTG can be implemented without Constable.

SHADOW DYNAMIC SYSTEMS

Constable is a product of Shadow Dynamic Systems LLC. Built for institutions that treat authority as infrastructure.

Contact

Jason Crittenden
Founder & Research Lead

jason@shadowdynamicsystems.com

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Related

Zero Trust GovernanceZTG source on GitHubShadow Dynamic Systems
General Constable marketing material. No third-party certification, endorsement, regulatory approval, customer result, or insurance validation is claimed. Constable is a control kernel; it does not by itself make AI risk-free, guarantee compliance, or govern surfaces where it is not integrated.
© 2026 Shadow Dynamic Systems LLCAuthority defines admission.
Implementation

How the invariants are met.

Start with the boundary.

The authorization modelImplementation commentaryThe mechanistic boundaryImplementation commentaryEvidence-coupled executionImplementation commentary

Meeting the invariants

One chapter per ZTG invariant — how Constable satisfies each requirement.

  • ObservabilityImplementation commentary · seedZTG-0a
  • ReplayabilityImplementation commentary · seedZTG-0b
  • Temporal IntegrityImplementation commentary · seedZTG-0c
  • Identity IntegrityImplementation commentary · seedZTG-0d
  • Governance ConsistencyImplementation commentary · seedZTG-0e
  • Mechanistic BoundaryImplementation commentary · seedZTG-1
  • StasisImplementation commentary · seedZTG-2
  • Governed Effect SurfaceImplementation commentary · seedZTG-3
  • Evidence-Coupled ExecutionImplementation commentary · seedZTG-4
  • Irreversibility of HarmImplementation commentary · seedZTG-5

Framing and conformance

Chapters outside the invariant set: what is in scope, how authority is modelled, and how conformance is verified.

  • Composition RequirementsImplementation commentary · seed
  • Conformance VerificationImplementation commentary · seed
  • Graded ConformanceImplementation commentary · seed
  • Input Sanitization BoundaryImplementation commentary · seed
  • Scope and PurposeImplementation commentary · seed
  • The Authorization ModelImplementation commentary · seed