<overview LangGraph models agent workflows as directed graphs : - StateGraph : Main class for building stateful graphs - Nodes : Functions that perform work and update state - Edges : Define execution order (static or conditional) - START/END : Special nodes marking entry and exit points - State with Reducers : Control how state updates are merged Graphs must be d before execution. </overview <design-methodology Designing a LangGraph application Follow these 5 steps when building a new graph: 1. Map out discrete steps — sketch a flowchart of your workflow. Each step becomes a node. 2. Identif…