The agent engineering platform.
LangChain is a framework for building software agents and applications powered by large language models, using reusable components and integrations. Developers use it to connect models, tools, and other services when creating AI applications and agent workflows. The catalogue includes MCP integrations and instructions related to LangChain.
Latest release langchain-core==1.7.6 · 5 Nov 2026
1 file for Codex and OpenCode: langchain AGENTS.md — 4,680 tokens loaded in every session.
AGENTS.md A 4,680 tok These files are langchain-ai/langchain's own configuration — they tell Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.