Module Boundary Review
Draws boundaries along what changes together, rather than along the organisation chart or the technical layer.
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Running it, start to finish
- Look at which files actually change together in git history.
- Find the cycles and the everything-depends-on-it module.
- Move one boundary at a time, shipping each step.
What you get back
The output this produces, every time.
- Uses what-changes-together as the test, which is what a boundary exists to serve.
- Identifies layer-based boundaries, where every feature change touches every layer.
- Accepts that some duplication is correct when two similar things change for different reasons.
Getting better results
Where this usually goes wrong, and how to avoid it.
- Look at your commits. Files that always change together are one thing. That evidence is in git and is more reliable than any architectural intuition.
- Watch the common package. A shared utilities module everything depends on means every change is a global change, which is the opposite of a boundary.
- Never restructure big-bang. They get abandoned half-way and leave two conventions in one codebase, which is worse than the original problem.
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Written for The AI University. Every prompt in this library is original work — authored, tested and revised here, not collected from elsewhere. 365 of them, free with an account.