Defense-in-Depth Validation

About

The Defense-in-Depth skill provides a rigorous framework for securing critical data paths by establishing validation checkpoints at every layer of execution. Instead of relying on a single point of failure, this skill guides the implementation of four distinct layers: entry-point validation, business logic rules, environment guards, and debug instrumentation. It is ideal for complex systems where invalid data could bypass simple checks through mocks or refactoring, ensuring that systems remain resilient and easy to debug even when edge cases occur.

Key Features

• Structured documentation of defense layers for long-term maintenance
• Context-specific environment guards for safe test execution
• 0 GitHub stars
• Automated data flow mapping across system layers
• Integrated bypass testing to ensure validation completeness
• Four-tier validation architecture (Entry, Business, Environment, Debug)

Use Cases

• Securing critical API boundaries where invalid input causes deep system failures
• Preventing dangerous file system or database operations in non-target environments
• Strengthening legacy codebases by identifying and guarding vulnerable data paths