Hand-rolled loops get you understanding; LangGraph gets you control at scale. LangGraph models an agent as a graph of nodes (steps) and edges (what happens next), with shared state passed between them, which gives you the things raw loops lack: durable execution, human-in-the-loop checkpoints, and clear control flow you can inspect.

You will rebuild your hand-made loop in LangGraph and feel the difference: the same behaviour, now debuggable, resumable, and ready for real complexity. We chose LangGraph over higher-level frameworks precisely because it stays low-level and controllable.