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Nine engineers, 1,211 code updates in a day: Lessons from building Copilot Cowork
In January, a nine‑engineer Microsoft team launched Copilot Cowork, an AI‑driven execution layer that automates multi‑step workflows for knowledge workers using Work IQ, Microsoft 365 security, and a multi‑model architecture. Within four and a half months the project progressed from an empty repository to general availability, and on October 21 the team merged 1,211 pull requests in a single day. Most code was generated by AI agents, while engineers defined specifications, set architectural and security boundaries, and reviewed high‑risk changes. The [...]