---
title: "LangChain (@langchain-ai)"
description: "Agent engineering platform for developers."
account: "langchain-ai"
---

# LangChain

Agent engineering platform for developers.

## APIs

2 public APIs with a stored document.
Each links to its markdown overview; the same address with
`/llms.txt` in place of `.md` lists its operations.
Changes across these APIs: https://skmtc.dev/langchain-ai/feed.md

- [LangSmith](https://skmtc.dev/langchain-ai/apis/langsmith.md): LLM observability: manage traces, datasets, experiments, feedback, prompts, and workspaces
- [LangSmith Deployment Control Plane API](https://skmtc.dev/langchain-ai/apis/langsmith-deployment-control-plane-api.md): Agent deployments: create and manage Agent Server deployments, listeners, API keys and OAuth connections