Practical Application

Use this refactoring method:

1. Map the current modules and the dependencies between them.
2. Identify clusters of files that together provide one meaningful capability.
3. Define a small interface for that capability.
4. Move the related logic behind the interface.
5. Create tests around the external behavior of the deeper module.
6. Update callers to depend on the interface rather than internal pieces.
7. Record the module and interface explicitly in future product and implementation plans.
8. Delegate internal implementation only after the interface and test boundary are clear.

For an end-to-end capability, the deep module may span a large flow. A browser-based editor, for example, can be structured so that an action at the interface is traceable through the back end and testable from the outside. Giving the agent a visible full flow and a reliable test boundary can transform its ability to make changes safely.