Defense-in-Depth Validation

Quick Review

Excellent skill that provides a systematic approach to multi-layer validation with clear methodology and concrete examples. The description adequately conveys the concept for CLI agent invocation. Task knowledge is strong with detailed implementation patterns across four distinct layers, a practical workflow ('Applying the Pattern'), and real-world examples. Structure is clean and logical with well-defined sections. Novelty is moderate-to-good: while validation itself is standard practice, the systematic four-layer framework (entry, business logic, environment guards, debug instrumentation) with the specific workflow reduces the cognitive load and token count a CLI agent would need to implement defense-in-depth correctly across a codebase. The skill transforms ad-hoc validation into a repeatable pattern that prevents entire classes of bugs structurally.