May 12, 2026
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8
minute read
AI Agents Will Break Any Rule You Don't Test
Most teams give their AI agents an AGENTS.md, a CLAUDE.md, or a Cursor rule full of polite architectural guidance. Layers, boundaries, where secrets live, what may import from what. Three weeks later the codebase is spaghetti reaching across every line they wrote down, and they wonder why the agent ignored them. Documents do not enforce architecture. Tests do. The fix is small, language-agnostic, and unforgiving: take your most important architecture rules, write them as a deterministic test, wire it into a pre-commit hook, and let CI run it again. Now the agent literally cannot finish the work if it breaks the architecture.
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