Pattern Proposal: Application Service Facade

Summary

Encapsulation of governance workflows behind a single coarse-grained service interface.

Candidate Pattern

• ID: application-service-facade
• Classification: architectural
• Maturity: strategic_direction
• Type: emerging

Observed Signals

No specific signals listed.

Evidence

Supporting Evidence

• src/cas_runner/governance/governance_action_service.py (GovernanceActionService) - Coordinates governance action execution across engines.

Scope Assessment

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

Rationale

• Intent: Provide entrypoints like CLI and external automation with a clean, cohesive boundary to complex governance engines.
• Context: The CLI and workflows need to execute complex multi-step operations (e.g. evaluating compliance, updating registers, and calculating health).
• Force: Presentation layer must not leak knowledge of engines or transition registries.
• Force: Business operations require multi-engine coordination.

Traceability

Artifact source: proposed-patterns