Defense-in-Depth Validation

About

This skill provides a rigorous framework for data validation by enforcing checks across four critical layers: entry points, business logic, environment guards, and debug instrumentation. It is designed for developers who need to move beyond single-point fixes and instead create robust systems where invalid data cannot propagate through the execution stack, effectively making certain classes of bugs impossible to reproduce even across different code paths, refactors, or mock-heavy testing environments.

Key Features

• Four-layer validation pattern (Entry, Business, Environment, Debug)
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• Detailed debug instrumentation for forensic analysis
• Data flow tracing and checkpoint mapping guidelines
• Structural bug prevention strategies
• Context-aware environment guards for testing safety

Use Cases

• Ensuring internal business logic remains intact even when external entry points are refactored
• Hardening complex APIs where input might bypass initial checks through different code paths
• Preventing dangerous operations like 'git init' or file deletions from occurring in unintended directories