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Interview: Design an Approval Workflow in LangGraph (EXPLAINED)

Scenario BasedLangGraphHard22 min read

**Graph structure** draft → auto_checks → legal_subgraph → manager_subgraph → publish; reject edges loop to draft with comments in state.

TL;DR — Quick Answer

Graph with role-based nodes, interrupt_before publish, checkpointed threads per document, SLA timers routing to escalate node, immutable audit log, and resumable async human steps.

The Interview Question

Design a LangGraph system for document approval: draft → legal review → manager sign-off → publish, with interrupts, SLAs, and audit.

Deep Explanation

Graph structure draft → auto_checks → legal_subgraph → manager_subgraph → publish; reject edges loop to draft with comments in state.

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

**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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