LangGraph GUI ReactFlow is an open-source React component library that enables users to construct AI agent workflows through an intuitive flowchart editor. Each node represents an LLM invocation, data transformation, or external API call, while edges define the data flow. Users can customize node types, configure model parameters, preview outputs in real time, and export the workflow definition for execution. Seamless integration with LangChain and other LLM frameworks makes it easy to extend and deploy sophisticated conversational agents and data-processing pipelines.