构建图

graph = StateGraph(AgentState) graph.add_node("researcher", research_fn) graph.add_node("writer", write_fn) graph.add_node("reviewer", review_fn)

graph.add_edge(START, "researcher") graph.add_conditional_edges("researcher", router) graph.add_edge("writer", "reviewer") graph.add_edge("reviewer", END)

app = graph.compile(checkpointer=SqliteSaver(conn)) ```

优缺点分析

优势：生产就绪度最高，LangSmith生态提供端到端可观测性；状态管理精细到节点级别；社区规模最大（25k+ Stars），Stack Overflow答案丰富；原生支持循环和分支，适合复杂业务流程。

劣势：学习曲线陡峭，图论