Your coding agent passed every test. It may still have made the next change harder.
rust
dev.to
Your coding agent passed every test. It may still have made the next change harder. I kept seeing the same failure mode while using frontier coding agents heavily. Individual tasks succeeded. Tests passed. Each iteration looked reasonable. But after enough iterations, the codebase became progressively harder to work with. The agents were strong at the task directly in front of them. What was missing was an independent structural feedback loop answering a different question before implementatio