📄 中文摘要
LangChain 是一个构建 LLM 驱动应用程序的框架，提供链、代理、RAG 管道、记忆和工具集成，能够将 LLM 连接到数据和现实世界。该框架是免费且开源的，LangSmith（可观察性）也提供了免费的使用层，每月可追踪 5000 次。通过简单的安装命令，用户可以快速上手，构建基本的链和代理，利用 OpenAI 的聊天功能进行交互。LangChain 的灵活性和扩展性使其成为开发 AI 代理的理想选择。用户可以利用其强大的功能来创建更智能的应用程序，提升用户体验。
LangChain 提供免费 API — 如何构建使用工具和记忆的 AI 代理
📄 English Summary
LangChain Has a Free API — Here's How to Build AI Agents That Use Tools and Memory
LangChain is a framework for building LLM-powered applications, offering chains, agents, RAG pipelines, memory, and tool integration, effectively connecting LLMs to data and the real world. It is free and open source, with LangSmith providing a free tier that allows for 5,000 traces per month. Users can quickly get started with a simple installation command to build basic chains and agents, utilizing OpenAI's chat capabilities for interaction. The flexibility and extensibility of LangChain make it an ideal choice for developing AI agents, enabling users to create smarter applications and enhance user experiences.