소개
The Defense-in-Depth skill guides Claude to move beyond single-point validation by implementing a robust architectural pattern that catches invalid data at every layer of execution. By applying validation at the entry point, business logic, environment, and instrumentation levels, this skill makes bugs structurally impossible to reproduce. It is particularly effective for hardening critical code paths, preventing dangerous operations in restricted environments, and ensuring that refactoring or mocks don't accidentally bypass essential system checks.
