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LangChain
The de-facto toolkit for composing LLM apps, chains and agents.
LangChain is a framework for building applications powered by large language models, providing composable abstractions for prompts, chains, agents, memory, and integrations with hundreds of model providers, vector stores, and tools. It is available in both Python and JavaScript/TypeScript and has become one of the most widely adopted libraries for LLM orchestration. Its modular design and large integration ecosystem make it a common starting point for prototyping and production LLM apps.
Repository
langchain-ai/langchainLanguage
PythonWhat you'd build with it
- Building agents that call external tools and APIs in a reasoning loop
- Composing multi-step LLM chains (e.g. retrieve, then summarize, then format)
- Wiring an LLM to many model providers and vector stores behind a uniform interface
Tags
orchestrationchainsagents