This is a joint session with CWS, our client. Point an AI agent at a Sitecore build with a thin prompt and it invents fields, off-design components, and logic that breaks in the next language. On the CWS migration to SitecoreAI, agents built almost the whole solution — components, pages, content, PowerShell, serialized YAML, MCP authoring, tests. Why it's reliable and not hallucinated guesswork? Context. We show how to engineer it — live.