AgentsThe story, in brief
Agents Refactor 300K Lines in Three Weeks, and Practitioners Ask What It Proves
300K lines refactored for $4,000. The harness did the heavy lifting — and practitioners are asking what that tells us about agent maturity.
The KeyNews take
Why it matters
CodeScene's case study shows agents at scale on a real codebase, but the story hinges on a verification harness that may be doing more work than the agent itself. Practitioners need to understand what generalizes and what depends on bespoke infrastructure.
The key facts
6 to know300,000 lines of C refactored over three weeks
Cost: ~$4,000 in tokens
Verification: frame-by-frame replay harness
Agents built codebase-specific playbooks during execution
Practitioners questioned scope, metric, and harness dependency
Source: CodeScene case study, published September 2026
Go to the source
InfoQ AI/MLinfoq.com
Publisher excerpt: 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…