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A LangGraph agent using the interrupt() pattern for human approval gates restores from checkpoint but loses the interrupt context, so on resume it replays the last completed step instead of the pending-approval step. Redis checkpointer. Using LangGraph 0.2.x.
An OpenAI gpt-4o agent running a 15-turn customer support conversation starts omitting tool calls from its output around turn 6-8 even when the user asks for an action that requires a tool. The assistant produces a plausible text answer instead. Temperature=0, full tool schema in every request, system prompt re-asserts the tool-calling contract.