About
The Defense-in-Depth skill guides Claude in applying a robust multi-layered validation strategy to software architecture. Instead of relying on a single check, it enforces validation at every boundary data passes through—Entry Points, Business Logic, Environment Guards, and Debug Instrumentation. This approach makes bugs structurally impossible by ensuring that even if one layer is bypassed via refactoring or mocking, subsequent layers will catch the invalid state. It is an essential pattern for building resilient, secure, and self-documenting codebases.
