MISSING_CHECKPOINTER

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][StateGraph] or @[@entrypoint].

Troubleshooting

The following may help resolve this error:

• Initialize and pass a checkpointer to the compile() method of @[StateGraph][StateGraph] or @[@entrypoint].

from langgraph.checkpoint.memory import InMemorySaver
checkpointer = InMemorySaver()
 
# Graph API
from langgraph.graph import StateGraph
graph = StateGraph(...).compile(checkpointer=checkpointer)
 
# Functional API
from langgraph.func import entrypoint
@entrypoint(checkpointer=checkpointer)
def workflow(messages: list[str]) -> str:
    ...

• Use the LangGraph API so you don't need to implement or configure checkpointers manually. The API handles all persistence infrastructure for you.

Related

• Read more about persistence (opens in a new tab).