If you’ve ever built a “quick” document automation and watched it crumble on real vendor layouts, you already know: document accuracy isn’t a model checkbox—it’s an architecture decision. Power Platform’s AI Builder makes it easy to start, but repeatable, production-grade accuracy comes from decisions you make upstream (data, thresholds, human review) and downstream (ops, ALM, compliance). This guide shares how I architect trained AI Builder solutions that survive real documents, real load, and real auditors.