About
The Defense-in-Depth skill provides a robust framework for Claude to apply multi-layered validation strategies to your codebase, ensuring that invalid data is caught at every architectural boundary. By enforcing checks across four distinct layers—entry points, business logic, environment guards, and debug instrumentation—this skill helps developers build systems where failures are caught immediately rather than causing silent corruption or deep-execution crashes. It is particularly effective for hardening critical operations, preventing test-environment leaks, and ensuring that refactors or mocks cannot bypass essential safety checks.
