In an agentified world where “anything is the UI,” the only place you can truly enforce rules is the platform edge—your server-side pipeline. This session shows how Dataverse plugins remain the last frontier for protecting business logic when requests arrive from model-driven apps, Canvas, Copilots, custom portals, RPA, or direct API calls. We’ll cover the essentials of building a robust plugin: solution structure, dependency injection patterns, tracing/telemetry, and safe calls to external services. You’ll learn how to register steps correctly (sync vs. async; pre-validate, pre-operation, post-operation), use images and filtering attributes, avoid recursion, and respect platform limits. We’ll wrap with a demo that hardens a business rule end-to-end. If you want predictable outcomes no matter which UI—or which agent—hits your data, this is your map.