LangChain has developed a specialized UI for deep agents, which are AI agents that plan, reason, and act over extended time periods. Deep agents differ from regular agents by having planning tools, delegating tasks to sub-agents, using file systems for storage, and employing detailed system prompts. The tutorial demonstrates setting up a researcher deep agent locally using LangGraph and connecting it to an open-source UI that displays the agent's planning process, file system status, and sub-agent activities in real-time.