LangGraph Checkpointing (Python)

Overview

A chat agent that "keeps introducing itself" is almost always P16. The caller invokes graph.invoke(state) without passing config={"configurable": {"thread_id": ...}} — LangGraph's checkpointer silently spawns a fresh state per call. No error, no warning, no log line. The user sees it; the code does not.

That is one of five separate checkpointing pitfalls this skill covers: