Microsoft is rolling out a built-in, AI-driven "Agent Mode" for Word and Excel—and a companion Office Agent inside Copilot Chat—that promises to turn prompts into finished, auditable spreadsheets, documents, and soon, presentations, fundamentally changing how people interact with Microsoft 365 tools. This is not a simple autocomplete feature: Microsoft describes vibe working as an agentic workflow where AI plans, executes, validates, and iterates on multi-step tasks inside the app, surfacing...