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DEEP EXPLANATION

Human-in-the-Loop with LangGraph Interrupt and Resume (ANSWERED)

Project BasedLangGraphMedium14 min read

**Interrupt API** LangGraph can interrupt execution before or after specified nodes — graph pauses, serializes checkpoint (lg-005), and returns control to host app. User sees proposed action; approver decision written to state; graph resumes from checkpoint.

TL;DR — Quick Answer

Use interrupt_before/after on sensitive nodes, persist checkpoint, surface pending state to UI, and resume with Command or human input updating state — never trust free-text chat as approval token.

The Interview Question

Explain LangGraph interrupt/resume for human approval. How would you pause before a dangerous tool call and continue after a human decision?

Deep Explanation

Interrupt API LangGraph can interrupt execution before or after specified nodes — graph pauses, serializes checkpoint (lg-005), and returns control to host app. User sees proposed action; approver decision written to state; graph resumes from checkpoint.

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