open-closed-principlelisted

## Activation Contract Load this skill when reviewing refactor plans for: open closed principle, OCP, strategy, policy, polymorphism. ## Hard Rules - Look for repeated conditionals by type, state, operation, or strategy. - Suggest strategy, policy, or polymorphism only when new variants are likely or already present. - Block pattern use when a simple conditional is clearer. - Preserve observable behavior; label functional changes as follow-up. - Require evidence for every recommendation, or mark it as a hypothesis. ## Decision Gates | Signal | Action | |---|---| | Concrete evidence exists | Create a finding with file, lines, symbol, benefit, validation, and rollback. | | Evidence is incomplete | Mark as hypothesis and lower confidence. | | Recommendation is cosmetic or speculative | Omit it unless maintainability benefit is clear. | ## Execution Steps 1. Inspect the target and nearby tests only as needed for this lens. 2. Identify findings that match this skill's responsibility. 3. Recommend the smallest safe behavior-preserving refactor. 4. Add validation and rollback steps for each recommendation. ## Output Contract Return structured findings for the calling reviewer. Return `no_findings` when this lens has no material issue. ## References None.