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You are attempting to use built-in LangGraph persistence without providing a checkpointer. This happens when a checkpointer is missing in the compile() method of StateGraph or @[@entrypoint].

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Troubleshooting

The following may help resolve this error:
  • Initialize and pass a checkpointer to the compile() method of StateGraph or @[@entrypoint].
import { InMemorySaver, StateGraph } from "@langchain/langgraph";
const checkpointer = new InMemorySaver();

// Graph API
import { StateGraph } from "@langchain/langgraph";
const graph = new StateGraph(...).compile({ checkpointer });

// Functional API
import { entrypoint } from "@langchain/langgraph";
const workflow = entrypoint(
    { checkpointer, name: "workflow" },
    async (messages: string[]) => {
        // ...
    }
);
  • Use the LangGraph API so you don’t need to implement or configure checkpointers manually. The API handles all persistence infrastructure for you.
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