LangGraph

LangGraph is a library built on top of LangChain for constructing stateful, multi-agent AI applications using graph-based workflows. It models agent logic as a directed graph where nodes represent actions (LLM calls, tool usage, human input) and edges represent transitions between states. LangGraph supports cycles, conditional branching, parallel execution, and persistent state, making it suitable for complex agentic workflows. It provides built-in support for human-in-the-loop interactions and can be deployed via LangGraph Platform for production use.