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GitHub Revamps Copilot Code Review by Switching to Unix-Style Exploration Tools

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GitHub has overhauled its Copilot code review system after discovering that adding better tools initially made performance worse. The engineering team found that migrating to shared Unix-style code exploration tools ultimately reduced the cost of code review operations. The key improvement came from reshaping agent workflows to focus on pull request evidence rather than broader code exploration. The change highlights how tool selection and workflow design can have counterintuitive effects on AI-assisted development systems.

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