Pattern Proposal: Pure Functional Health Evaluation Heuristic

Summary

Computes composite health metrics and evaluation reasons through stateless, pure functional calculations derived from metric aggregates.

Candidate Pattern

• ID: functional-health-evaluation-heuristic
• Classification: architectural
• Maturity: strategic_direction
• Type: emerging

Observed Signals

No specific signals listed.

Evidence

Supporting Evidence

• src/cas_runner/dashboard/health_model.py (HealthStatus, calculate_health, get_health_reasons) - Implements pure functional evaluation of health state based on metric findings.

Scope Assessment

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

Rationale

• Intent: Prevent state mutation and side-effects during architectural health audits by calculating status purely from input metrics.
• Context: Dashboards and CLI tools need to assess system architectural health based on compliance metrics, risks, and unresolved exceptions.
• Force: Mutable calculation logic inside UI models risks inconsistent reporting
• Force: Health aggregation logic must be easily unit tested in isolation

Traceability

Artifact source: proposed-patterns