The First LangChain: Building AI/LLM Applications with LangChain and LangGraph New, Unread Price: 4620 yen LangChain is a framework that supports the development of applications utilizing large language models. This book explains in detail prompt design, RAG index construction, conversation memory, external tool integration, and autonomous agents, providing a thorough explanation from basic theory to implementation, testing, CI/CD, operational monitoring, and continuous improvement, all with abundant sample code in Python and JavaScript. Furthermore, it covers advanced agent architectures with LangGraph, integration with external data and tools, and monitoring and evaluation methods, making it suitable for various LLM project requirements such as internal document search, FAQ bots, personalized assistants, and business automation.