langgraph-human-in-the-loop

You can pause LangGraph execution for human validation using the interrupt() function, which stops the graph at a specific node to await user input, approvals, or error handling before proceeding.

To resume a LangGraph workflow after an interrupt, use the Command(resume=...) pattern. This passes the validated human input back into the graph, allowing execution to continue from the paused node.

Yes, you can handle multiple parallel interrupts in a single LangGraph invocation. This allows the workflow to pause at several points simultaneously, collecting multiple human inputs before resuming execution.

You need idempotency rules before calling interrupt() in LangGraph to prevent duplicate side effects. Since resuming execution replays the graph, idempotent actions ensure no repeated operations occur after the pause.

You create validation loops in LangGraph by combining interrupt() and Command(resume=...) to pause execution, check user input, and re-prompt the user until valid data is received and processed successfully.

Yes, LangGraph supports human-in-the-loop workflows for reviewing code changes or analyzing data. It manages controlled pauses and resumption to handle human oversight efficiently within complex automated workflows.