这篇论文给了三个LangGraph实操例子，告诉你什么时候用它比ReAct或DSPy更合适，特别适合跑长时间有状态的业务流程。
该论文介绍了基于LangGraph的三种可执行工作流方案：SQL分析带修复循环、智能体RAG带证据门控、人工在环策略审查带中断恢复。每种方案展示了类型化状态、条件路由、确定性工具、重试、中断和检查点恢复的组合方式。论文还对比了LangGraph与ReAct、SDK循环、DSPy等方法的适用场景，强调LangGraph适用于需要显式结构的工作流，而非通用默认选项。每份实践方案均说明了何时LangGraph值得额外结构，以及如何使路由、暂停和审计追踪成为显式产品行为。
Graph-Based Agentic AI with LangGraph: Workflow Pathways for Long-Running Stateful Business Processes
This paper is a practitioner guide to graph-based workflow pathways for long-running, stateful, multi-step generative AI systems in business processes. Rather than treating LangGraph, a low-level orchestration framework for stateful agents, as a model-quality benchmark target, we present three executable recipes -- SQL analytics with repair loops, agentic retrieval-augmented generation with evidence gating, and human-in-the-loop policy review with interrupt and checkpoint recovery -- to show how typed state, conditional routing, deterministic tools, retries, interrupts, checkpoints, and traces fit together. LangGraph is positioned by workflow-complexity fit, not as a universal default: simpler ReAct-style or plain SDK loops may be better for basic tool use, schema-first tools for structured extraction and validation, and DSPy when prompt or program optimization is the main goal. Each recipe explains when LangGraph is worth the extra structure and which implementation patterns make routes, pauses, and audit trails explicit product behavior rather than hidden prompt logic.