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Documentation Index

Fetch the complete documentation index at: https://docs.langchain.com/llms.txt

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Documentation

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

LangSmith

LangSmith is a platform that helps AI teams use live production data for continuous testing and improvement. LangSmith provides:
https://mintcdn.com/langchain-5e9cc07a/nQm-sjd_MByLhgeW/images/brand/observability-icon-dark.png?fit=max&auto=format&n=nQm-sjd_MByLhgeW&q=85&s=ccbc183bca2a5e4ca78d30149e3836cc

Observability

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

Engine

Automatically detect and resolve recurring issues in your tracing projects.
https://mintcdn.com/langchain-5e9cc07a/nQm-sjd_MByLhgeW/images/brand/evaluation-icon-dark.png?fit=max&auto=format&n=nQm-sjd_MByLhgeW&q=85&s=4918f932fff73a33d6a24e2fcf68f6a4

Evaluation

Test and score agent behavior on production data or offline datasets to continuously improve performance.
https://mintcdn.com/langchain-5e9cc07a/nQm-sjd_MByLhgeW/images/brand/prompt-engineering-icon.png?fit=max&auto=format&n=nQm-sjd_MByLhgeW&q=85&s=eaa7ac978bebe5a7cd84d8eeaaef84c2

Prompt Engineering

Iterate on prompts with version control, prompt optimization, and collaboration features.
https://mintcdn.com/langchain-5e9cc07a/nQm-sjd_MByLhgeW/images/brand/deployment-icon-dark.png?fit=max&auto=format&n=nQm-sjd_MByLhgeW&q=85&s=024e3712d388bfa55f4f160cc9d6a85b

Deployment

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

LLM Gateway (Private beta)

Proxy LLM calls to enforce spend limits, redact sensitive data, and centrally manage provider credentials.
LangSmith meets the highest standards of data security and privacy with HIPAA, SOC 2 Type 2, and GDPR compliance. Meet with our team to learn more or visit our Trust Center.

LangSmith Fleet

https://mintcdn.com/langchain-5e9cc07a/_jaNDz0QENsVkDXY/images/brand/fleet-icon-dark.png?fit=max&auto=format&n=_jaNDz0QENsVkDXY&q=85&s=98e3bbb4ae01325a8ff867e80681778f

Fleet

Create helpful AI agents without code. Start from a template, connect your accounts, and let the agent handle routine work while you stay in control.

Open source agent frameworks

https://mintcdn.com/langchain-5e9cc07a/nQm-sjd_MByLhgeW/images/brand/deep-agents-icon.png?fit=max&auto=format&n=nQm-sjd_MByLhgeW&q=85&s=1cc68f66a9e7550331cc0875f1ba53af

Deep Agents (Python)

Quickly build agents that can tackle any task.
https://mintcdn.com/langchain-5e9cc07a/nQm-sjd_MByLhgeW/images/brand/langchain-icon.png?fit=max&auto=format&n=nQm-sjd_MByLhgeW&q=85&s=663b30f85baf99ad708b97e05da2a5a4

LangChain (Python)

Customize the building blocks of your agents.
https://mintcdn.com/langchain-5e9cc07a/nQm-sjd_MByLhgeW/images/brand/langgraph-icon.png?fit=max&auto=format&n=nQm-sjd_MByLhgeW&q=85&s=b997e1a7487d507a36556eedbfd99f81

LangGraph (Python)

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

Get started

Build your first agent with LangChain

Sign up for LangSmith

Build an advanced agent with LangGraph

Enroll in LangChain Academy

Additional resources

Community forum

Ask questions, share solutions, and discuss best practices.

Community Slack

Connect with other builders and get quick help.

Support portal

Submit tickets and track support requests.

LangSmith status

Real-time status of LangSmith services and APIs.