Your LangGraph StateGraph reached the maximum number of steps before hitting a stop condition. This is often due to an infinite loop caused by code like the example below: 
class State(TypedDict):
    some_key: str

builder = StateGraph(State)
builder.add_node("a", ...)
builder.add_node("b", ...)
builder.add_edge("a", "b")
builder.add_edge("b", "a")
...

graph = builder.compile()
However, complex graphs may hit the default limit naturally.

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Troubleshooting

  • If you are not expecting your graph to go through many iterations, you likely have a cycle. Check your logic for infinite loops.
  • If you have a complex graph, you can pass in a higher recursion_limit value into your config object when invoking your graph like this: 
graph.invoke({...}, {"recursion_limit": 100})