The router of Exercise 1 kept a few named strings in its state. A NorthPeak agent that talks with a technician needs more: the whole conversation, growing at every step, plus a way to run query_database and search_manuals when the model asks for them. With MessagesState the whole conversation lives in the state, the model asks for tools as messages, and a ToolNode runs them and answers with messages. This lesson explains the message list, its reducer, the four kinds of messages, and one real run on machine M014.
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