Without memory, the NorthPeak agent forgets the previous question as soon as graph.invoke returns. A technician who asks "How many incidents does M014 have?" and then "And what is its machine type?" gets a second answer that ignores the first. A checkpointer is the object that saves the state after every node under a thread_id, so a conversation can continue tomorrow, on the same laptop, from a SQLite file. This lesson covers the checkpoint, the SqliteSaver, the thread, and a real run with and without memory.
Preview — the rest of the lesson is for enrolled readers.
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