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A checkpoint saver object or flag.

If provided, this Checkpointer serves as a fully versioned "short-term memory" for the graph, allowing it to be paused, resumed, and replayed from any point.

If None, it may inherit the parent graph's checkpointer when used as a subgraph.

If False, it will not use or inherit any checkpointer.

Important: When a checkpointer is enabled, you should pass a thread_id in the config when invoking the graph:

config = {"configurable": {"thread_id": "my-thread"}}
graph.invoke(inputs, config)

The thread_id is the key used to store and retrieve checkpoints. Use a unique ID for independent runs, or reuse the same ID to accumulate state across invocations (e.g., for conversation memory).

An optional list of node names to interrupt before.