LangGraph Study #3 — Human-in-the-Loop (Approving Risky Tools) · Checkpoints and the Interrupt Mechanism
When an agent automatically calls risky tools like file deletion, sending emails, or payments, things go wrong. Implementing the HITL pattern using LangGraph's checkpoint + Interrupt mechanism to get human approval right before a risky tool call. An unexpected trap: the LLM's own safety guard can block execution before it ever reaches HITL. How to separate the system prompt from the HITL gate.
