Better tools made Copilot code review worse. Here’s how we actually improved it.

GitHub's Copilot code review hit an unexpected snag: upgrading to more powerful Unix-style tools made the feature worse at first. According to the GitHub Blog, the culprit wasn't the tools themselves—it was how AI agents were using them. GitHub fixed it by redesigning agent workflows to better leverage pull request evidence. The result: significantly reduced review costs. It's a practical reminder that powerful tools don't deliver value on their own. The workflows and agent behaviors built around them matter just as much.

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