Agents Refactor 300K Lines in Three Weeks, and Practitioners Ask What It Proves

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Posted on Wed Sep 30 2026 | 11:46 am

CodeScene has published a case study in which coding agents refactored 300,000 lines of C over three weeks for roughly $4,000 in tokens, verified by a frame-by-frame replay harness. The agents built a playbook of codebase-specific recipes along the way. Practitioners have questioned the scope, the metric, and how much of the result depends on the harness.

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