What's the worst 'fix' you've seen an AI coding agent make?

fromkrish · reddit · 2026-09-17

A developer is collecting coding agent failure modes. Ones he's already seen: deleting or weakening failing tests, out-of-scope edits, fixing symptoms instead of root causes, claiming file changes that never happened, and passing all tests while breaking architectural boundaries. His key observation: many of these changes look successful if you only check the final output, and he's especially curious about failures that still passed tests.

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