AI Coding Agent Refactors 717k-Line Codebase Without Human Review

Joel Abenhaim · hf · 2026-08-14

A case study shows an AI coding agent successfully dismantled a core architectural invariant in a 717k-line TypeScript codebase under a specification-first protocol, touching 189 files with no test oracle and no human code review. The process took 3 days, cost $2,430, and corrected 201 defects across 31 audit passes.

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