GitHub Copilot Rubber Duck is a new review feature in GitHub Copilot CLI that uses a second, different model family to challenge the plan, implementation, or tests produced by the primary coding agent. The core insight is that AI coding agents often fail not with obvious errors but with polished, internally consistent output
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Why a second opinion actually helpsWhat starts to matter on harder tasksWhy this matters more at platform scaleIt only works if it stays targetedA better direction for AI-assisted engineeringSort: