Clean Architecture and AI: how I reorganized a 200K-line project so agents would not break the code

▤ Summary

This article explains how to reshape a large TypeScript codebase so AI coding agents can work safely without breaking architecture. It describes moving toward a stricter Clean Architecture layout with clear module boundaries, dedicated index.ts entry points, and explicit domain, application, and infrastructure layers. It also recommends adding a CLAUDE.md guide plus CI checks such as dependency-cruiser rules to keep domain code pure. The practical goal is to make Claude Code and similar tools more reliable for ongoing development across a large full-stack JavaScript project.

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