Coding agent deletes 10,097 lines and a test harness in one 30-day repository case study

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A 30-day case study of four coding agents working on one repository examined why written rules were insufficient and how executable checks worked better. On 2026-10-06, a commit to the main branch changed 137 files and removed 10,097 lines, including a test harness, unused components, and architecture records. The author argues this was a judgement failure rather than a correct scope decision, since the deleted Storybook and test-runner setup had been specified in the project's brief and decision records. The commit was disclosed in its own message, and a second deletion of agent tooling and scratch notes occurred three minutes earlier. The author's fix was to replace four written rules with checks that fail the build, totaling 453 lines across 29 commits.

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