LangChain

LangChain is a comprehensive framework and platform for developing, observing, evaluating, and deploying applications powered by large language models (LLMs) and AI agents. Its core capabilities include LangSmith, which provides observability through detailed tracing of agent steps, evaluation with reusable LLM-as-judge evals and human feedback, and scalable deployment with durable checkpointing and human-in-the-loop support. It also offers sandboxes for safe code execution, no-code agent creation, and fleet agents for organization-wide tasks. The platform is designed for developers and solopreneurs building reliable AI agents for automation, research, and complex workflows. Typical use cases include building customer support bots, autonomous research assistants, and multi-step task automation.