LangChain

LangChain is an open agent engineering platform for building, testing, deploying, monitoring, iterating, and governing AI agents. It supports agent development with or without code and works with different model providers.

The platform includes open-source frameworks such as Deep Agents, LangChain, and LangGraph, along with tools for observability, evaluation, deployment, sandboxes, context management, and model governance. LangSmith provides tracing, evaluations, dashboards, alerts, and agent engineering workflows.

It is available for SaaS, bring-your-own-cloud, and self-hosted deployments. The site provides documentation, demos, and a LangSmith entry point.

Highlights

• Build agents with Deep Agents, LangChain, LangGraph, or Fleet
• Debug runs with step-by-step tracing and evaluate agent behavior
• Deploy agents for long-running tasks, persistent state, and secure execution
• Monitor quality, cost, latency, errors, and tool behavior
• Govern model calls, spending, sensitive data, and human approvals