Checkpointer
A checkpointer is a component or object that saves and restores snapshots of state to support persistence, retrieval, or resumption.
AI Agents and Applications
A checkpointer is a component that saves and restores workflow state, including conversational information, across executions or interactions.
- How it is used
- Maintains conversational state across turns and can also support recovery and human approval workflows.
- How deep it goes
- Explains snapshots at graph super-steps and demonstrates inspecting and restoring state, without detailing storage internals.
- Examples
- Uses a travel assistant to resolve “the same town” after restoring a checkpoint from a Penzance weather conversation.
- What you can do after
- Apply it via LangGraph to persist conversational state and resume a workflow from a selected checkpoint.
Build Python Web Apps with Streamlit
A checkpointer is a component that saves snapshots of graph state during execution so that later invocations can resume or recall prior state.
- How it is used
- Preserves graph state across invocations so conversational applications can continue a thread instead of restarting.
- How deep it goes
- Defines in-memory checkpointing and mentions database alternatives, but stops short of implementing durable database storage.
- Examples
- Uses a chatbot follow-up, MemorySaver, a fixed thread ID, and a LangGraph compilation call.
- What you can do after
- Apply it via LangGraph to preserve conversational state across repeated graph invocations.
Read how Build Python Web Apps with Streamlit explains checkpointer →
Related concepts
- InMemorySaverincludes · InMemorySaver is a LangGraph checkpointer that stores workflow state snapshots in process memory.
- LangGraphused by · LangGraph is a framework for building stateful, graph-structured workflows and applications, including those involving language models and agents.
- dialogueproduces · Dialogue is an ordered exchange of related messages across successive turns between participants or an interactive system and its users.
- stateuses · State is information or a configuration describing the condition of a system, entity, or computation at a particular time and potentially influencing subsequent behavior or decisions.
- checkpointingproduces · A checkpoint is a designated point in a process at which its state or progress is recorded or evaluated, often to support recovery, continuation, or control.
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