LangGraph Checkpointing: Three Production Rewrites Before It Clicked

1Key Takeaways

• Originally published on AIdeazz — cross-posted here with canonical link.
• My first LangGraph agent silently discarded every job for weeks.
• The memory field in my AgentState was defined as a list[str] , but my agent was writing a list[dict] .
• LangGraph's SqliteSaver didn't throw an error; it just truncated the state, leaving an empty list.