[API Reference](https://api.js.langchain.com/): LLM should read this page when learning about LangChain.js framework, understanding its core components, or exploring how to build LLM-powered applications. (LangChain.js is a TypeScript framework for developing applications powered by language models. It offers composable tools and integrations across Model I/O, Retrieval, and Agents modules. The ecosystem includes multiple packages (@langchain/core, @langchain/community, langchain, LangGraph.js), supports various environments, and enables context-aware applications that can reason using LLMs.)

