When GitHub’s Copilot Coding Agent (CCA) first became available in May 2025, the promise of cloud-based AI coding agents was generating enormous excitement, and equal skepticism. So we began an experiment, and like many experiments in software engineering, it started with a simple question: could a cloud-based AI coding agent meaningfully contribute to one of the most complex, most scrutinized, and most critical open source codebases in the world

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