Need help on making sense of the "Part 4: Human-in-the-loop" in the LangGraph Quick Start Tutorial

[Albert-Gao]

URL: https://langchain-ai.github.io/langgraph/tutorials/introduction/#part-4-human-in-the-loop

My question:

The flow here is the user asks a question and the LLM invokes a tool call to provide an answer, from the example, I see no value provided from the new interrupt_before=["tools"] parameter.

For the following explanation, it makes things even more confusing, isnt the previous example(Part 2: Enhancing the Chatbot with Tools) tools also? according to this langsmith log (https://smith.langchain.com/public/4fbd7636-25af-4638-9587-5a02fdbb0172/r/2b55e643-f5c8-4ca8-a401-8b5a9f282a43)

Notice that unlike last time, the "next" node is set to 'tools'. We've interrupted here! Let's check the tool invocation.

Where is the interruption, please?

[Albert-Gao]

asked under the doc