Threads

A thread contains the accumulated state of a sequence of runs. If a run is executed on a thread, then the state of the underlying graph of the assistant will be persisted to the thread.

A thread's current and historical state can be retrieved. To persist state, a thread must be created prior to executing a run.

The state of a thread at a particular point in time is called a checkpoint. Checkpoints can be used to restore the state of a thread at a later time.

For more on threads and checkpoints, see this section of the LangGraph conceptual guide.

The LangGraph Cloud API provides several endpoints for creating and managing threads and thread state. See the API reference for more details.