> ## Documentation Index
> Fetch the complete documentation index at: https://docs.langchain.com/llms.txt
> Use this file to discover all available pages before exploring further.

# LangSmith reference

The following sections provide API references and SDK documentation for LangSmith:

## LangSmith SDKs

<CardGroup cols={2}>
  <Card title="Python SDK" icon="brand-python" href="/langsmith/smith-python-sdk">
    Reference documentation for the LangSmith Python SDK.
  </Card>

  <Card title="JavaScript/TypeScript SDK" icon="brand-javascript" href="/langsmith/smith-js-ts-sdk">
    Reference documentation for the LangSmith JavaScript/TypeScript SDK.
  </Card>

  <Card title="Go SDK" icon="brand-golang" href="/langsmith/smith-go-sdk">
    Reference documentation for the LangSmith Go SDK.
  </Card>

  <Card title="Java SDK" icon="coffee" href="/langsmith/smith-java-sdk">
    Reference documentation for the LangSmith Java SDK.
  </Card>
</CardGroup>

## LangGraph SDKs

<CardGroup cols={2}>
  <Card title="LangGraph Python SDK" icon="sitemap" href="/langsmith/langgraph-python-sdk">
    Reference documentation for deploying LangGraph applications with Python.
  </Card>

  <Card title="LangGraph JS/TS SDK" icon="sitemap" href="/langsmith/langgraph-js-ts-sdk">
    Reference documentation for deploying LangGraph applications with JavaScript/TypeScript.
  </Card>
</CardGroup>

## APIs

<CardGroup cols={2}>
  <Card title="LangSmith API" icon="code" href="/langsmith/smith-api-ref">
    Complete REST API reference for LangSmith platform features.
  </Card>

  <Card title="Deployment APIs" icon="server" href="/langsmith/server-api-ref">
    API references for self-hosted and hybrid LangSmith deployments.
  </Card>
</CardGroup>

***

<div className="source-links">
  <Callout icon="terminal-2">
    [Connect these docs](/use-these-docs) to Claude, VSCode, and more via MCP for real-time answers.
  </Callout>

  <Callout icon="edit">
    [Edit this page on GitHub](https://github.com/langchain-ai/docs/edit/main/src/langsmith/reference.mdx) or [file an issue](https://github.com/langchain-ai/docs/issues/new/choose).
  </Callout>
</div>