Improve Codebase Architecture

To identify shallow modules in your codebase architecture, apply the deletion test: if removing a module merely shifts its internal complexity to callers, it is shallow and needs deepening to hide those details behind a stable interface.

The deletion test for module design checks whether deleting a module simply shifts complexity to its callers. If it does, the module is shallow and leaks implementation details, indicating a need for architectural refactoring and deeper interfaces.

To improve codebase testability, locate seams and leverage adapter patterns to move behavior behind smaller, stable interfaces. This increases locality and reduces architectural friction, making systems much easier to test and reason about.

The best way to refactor for interface stability is to map deepening opportunities by finding leverage points, then refine the new module structure through a detailed design interview to ensure smaller, stable interfaces and better testability.

Yes, you can use this approach to make your codebase easier to navigate during AI-assisted development. Deepening modules and reducing architectural friction increases locality, which directly improves AI navigability and system reasoning.