developing-langgraph-js-agents

<essential_principles>

How LangGraph.js Agents Work

LangGraph decomposes agents into discrete nodes (functions) connected through shared state. Execution flows through a graph where nodes do work and edges determine what runs next.

1. State-First Design

State is the shared memory accessible to all nodes. Design state before nodes:

import { Annotation, MessagesAnnotation } from "@langchain/langgraph";