Defense-in-Depth Validation FAQs

Question 1

When should I use multi-layered validation?

Accepted Answer

You should use it whenever invalid data causes failures deep in execution, or when a single check might be bypassed by refactoring, different code paths, or testing mocks.

Question 2

What are the four layers of validation used in this skill?

Accepted Answer

The four layers are Entry Point Validation (rejecting invalid input at boundaries), Business Logic Validation (ensuring data makes sense for the operation), Environment Guards (preventing dangerous actions in specific contexts), and Debug Instrumentation (capturing forensics).

Question 3

Does this skill work with any programming language?

Accepted Answer

Yes, while the implementation patterns are shown in TypeScript, the architectural principle of defense-in-depth validation is applicable to any software development environment supported by Claude Code.

Question 4

What is the core principle of this Defense-in-Depth skill?

Accepted Answer

The core principle is to validate data at every layer it passes through—entry points, business logic, and environment guards—to make bugs structurally impossible rather than just fixing them at a single point.

Defense-in-Depth Validation

Key Features

Use Cases

Defense-in-Depth Validation

Key Features

Use Cases