LangChain Middleware & HITL
- HumanInTheLoopMiddleware / humanInTheLoopMiddleware: Pause before dangerous tool calls for human approval
- Custom middleware: Intercept tool calls for error handling, logging, retry logic
- Command resume: Continue execution after human decisions (approve, edit, reject)
Requirements: Checkpointer + thread_id config for all HITL workflows.
Human-in-the-Loop
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