Documentation

LangChain is the platform for agent engineering. AI teams at Replit, Clay, Rippling, Cloudflare, Workday, and more trust LangChain’s products to engineer reliable agents.

Open source agent frameworks

Python
TypeScript

LangChain (Python)

Quickly get started building agents, with any model provider of your choice.

LangGraph (Python)

Control every step of your custom agent with low-level orchestration, memory, and human-in-the-loop support.

Deep Agents (Python)

Build agents that can tackle complex, multi-step tasks.

LangSmith

LangSmith is a platform that helps AI teams use live production data for continuous testing and improvement. LangSmith provides:

Observability

See exactly how your agent thinks and acts with detailed tracing and aggregate trend metrics.

Evaluation

Test and score agent behavior on production data or offline datasets to continuously improve performance.

Prompt Engineering

Iterate on prompts with version control, prompt optimization, and collaboration features.

Deployment

Ship your agent in one click, using scalable infrastructure built for long-running tasks.

LangSmith meets the highest standards of data security and privacy with HIPAA, SOC 2 Type 2, and GDPR compliance. For more information, see the Trust Center.

Documentation

Open source agent frameworks

LangChain (Python)

LangGraph (Python)

Deep Agents (Python)

LangSmith

Observability

Evaluation

Prompt Engineering

Deployment

Get started

Build your first agent with LangChain

Sign up for LangSmith

Build an advanced agent with LangGraph

Enroll in LangChain Academy