Keeping track of the times we pass through each node in langgraph

[arnaupv]

Checked

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Feature request

It would be cool to be able to keep the track of the times langgraph passess through each node.

Motivation

When testing the langgraph I would like to check the amount of time I passed through a certain node (for optimization purposes).

Proposal (If applicable)

We could have a specific AgentState that already has an "iteration" field. This Field would be another Pydantic object that would have as many fields as nodes we have in the langraph. Then with a simple, wrapper (python decorator), we could add the +1 to the specific iterator, whenever the graph passes through a specific node.

[xlight05]

+1 for this