Pattern Proposal: Layered Governance Service Facade

Summary

Exposes a high-level application service facade orchestrating discrete domain engines for governance actions and compliance checks.

Candidate Pattern

• ID: layered-governance-service-facade
• Classification: architectural
• Maturity: emerging
• Type: emerging

Observed Signals

No specific signals listed.

Evidence

Supporting Evidence

• src/cas_runner/governance/governance_action_service.py (GovernanceActionService) - Coordinates governance action execution and compliance engine checks.
• src/cas_runner/governance/compliance_engine.py (ComplianceEngine) - Domain engine leveraged by the service facade.

Scope Assessment

• Evidence Strength: high
• Confidence: high
• Applies to: ideas-to-life-cas

Rationale

• Intent: Present a cohesive application interface to presentation layers (CLI/Runner) while coordinating underlying domain engines.
• Context: Executing a governance action involves validating compliance rules, evaluating state transitions, and persisting findings across multiple sub-systems.
• Force: Prevent CLI commands from orchestrating low-level engine details
• Force: Maintain clear boundary between domain rule calculation and transaction orchestration

Traceability

Artifact source: proposed-patterns