AI is a powerful tool, but it is not the only tool, and most systems worth building are hybrids of AI and non-AI parts. That line between them doesn’t sit neatly between domains. It runs inside every domain, and it should move as you learn. This talk looks at the mechanisms for connecting across that line: APIs, MCP, agent skills, and sub-agents, as well as at workflows as a way to move the line itself: when an agent keeps rediscovering the same business process, that process belongs in deterministic execution, not in a prompt. You’ll leave knowing which mechanism belongs where, and how to keep shifting work out of AI as your system settles.