Defense-in-Depth Validation

The Defense-in-Depth Validation skill provides a method for ensuring data integrity at every stage of execution by applying validation at multiple system layers. The skill is designed to address the problem of invalid data causing bugs deep in execution, where a single validation point might not be enough. It ensures that each layer of a system is protected by checks, preventing bugs from slipping through various code paths, refactorings, or mocked environments. This approach leads to a more robust and resilient system where validation is enforced at every level of operation, from entry points to business logic and environmental guards.