LangChain is a framework for building LLM applications by composing prompts, models, tools, memory and agents, with a vast ecosystem of integrations.
From the README
uv add langchain
- Deep Agents — Build agents that can plan, use subagents, and leverage file systems for complex tasks
- LangGraph — Build agents that can reliably handle complex tasks with our low-level agent orchestration framework
- Integrations — Chat & embedding models, tools & toolkits, and more
- LangSmith — Agent evals, observability, and debugging for LLM apps
- LangSmith Deployment — Deploy and scale agents with a purpose-built platform for long-running, stateful workflows
Excerpts from the project README on GitHub. Copyright and licensing remain with the respective authors.
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langchain has 145k stars on GitHub. It has been forked 24.2k times. langchain is written mainly in Python / JS. It has been in active development since 2022. langchain is available under the MIT license. Its main topics are agents, ai, ai-agents, anthropic.
Read the full guideWhat is langchain?
The agent engineering platform.
Is langchain open source?
langchain is an open-source project. It is released under the MIT license.
Is langchain free?
Yes. langchain is free and open source — you can use, modify and self-host it.
What license does langchain use?
langchain is available under the MIT license.
What language is langchain written in?
langchain is written mainly in Python / JS.
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