When the NorthPeak agent gives a wrong answer, invoke shows you the end and nothing in between. Which tool ran, with which SQL, and how long the model took are all hidden. A trace is the ordered record of a run, one line per step, that you can read tomorrow. graph.stream(..., stream_mode="updates") gives you every node's update as it happens, and one JSON line per update makes that trace. This lesson covers the move from invoke to stream, the JSONL format, and what the trace of three real questions shows.
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