> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-devupd-1765394015-eccef47.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

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    <h1 class="flex whitespace-pre-wrap group font-semibold text-2xl sm:text-3xl mt-8">Documentation</h1>

    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.

    <h2 class="flex whitespace-pre-wrap group font-semibold">Open source agent frameworks</h2>

    <Tabs>
      <Tab title="Python" icon="python">
        <CardGroup cols={3}>
          <Card title="LangChain (Python)" href="/oss/python/langchain/overview" icon="link" cta="Learn more">
            Quickly get started building agents, with any model provider of your choice.
          </Card>

          <Card title="LangGraph (Python)" href="/oss/python/langgraph/overview" icon="circle-nodes" cta="Learn more">
            Control every step of your custom agent with low-level orchestration, memory, and human-in-the-loop support.
          </Card>

          <Card title="Deep Agents (Python)" href="/oss/python/deepagents/overview" icon="robot" cta="Learn more">
            Build agents that can tackle complex, multi-step tasks.
          </Card>
        </CardGroup>
      </Tab>

      <Tab title="TypeScript" icon="js">
        <CardGroup cols={3}>
          <Card title="LangChain (TypeScript)" href="/oss/javascript/langchain/overview" icon="link" cta="Learn more">
            Quickly get started building agents, with any model provider of your choice.
          </Card>

          <Card title="LangGraph (TypeScript)" href="/oss/javascript/langgraph/overview" icon="circle-nodes" cta="Learn more">
            Control every step of your custom agent with low-level orchestration, memory, and human-in-the-loop support.
          </Card>

          <Card title="Deep Agents (TypeScript)" href="/oss/javascript/deepagents/overview" icon="robot" cta="Learn more">
            Build agents that can tackle complex, multi-step tasks.
          </Card>
        </CardGroup>
      </Tab>
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    <h2 class="flex whitespace-pre-wrap group font-semibold">LangSmith</h2>

    [**LangSmith**](/langsmith/home) is a platform that helps AI teams use live production data for continuous testing and improvement. LangSmith provides:

    <CardGroup cols={3}>
      <Card title="Observability" href="/langsmith/observability" icon="magnifying-glass" cta="Learn more">
        See exactly how your agent thinks and acts with detailed tracing and aggregate trend metrics.
      </Card>

      <Card title="Evaluation" href="/langsmith/evaluation" icon="chart-simple" cta="Learn more">
        Test and score agent behavior on production data or offline datasets to continuously improve performance.
      </Card>

      <Card title="Prompt Engineering" href="/langsmith/prompt-engineering" icon="terminal" cta="Learn more">
        Iterate on prompts with version control, prompt optimization, and collaboration features.
      </Card>

      <Card title="Deployment" href="/langsmith/deployments" icon="rocket-launch" cta="Learn more">
        Ship your agent in one click, using scalable infrastructure built for long-running tasks.
      </Card>

      <Card title="Agent Builder (Beta)" href="/langsmith/agent-builder" icon="wand-magic-sparkles" cta="Learn more">
        Turn natural-language ideas into production agents with persistent memory and self-updating capabilities.
      </Card>
    </CardGroup>

    <Callout icon="lock" color="#DFC5FE" iconType="regular">
      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](https://trust.langchain.com/).
    </Callout>

    <h2 class="flex whitespace-pre-wrap group font-semibold">Get started</h2>

    <CardGroup cols={4}>
      <Card title="Build your first agent with LangChain" icon="gear" href="/oss/python/langchain/quickstart" cta="Get started" />

      <Card title="Sign up for LangSmith" icon="screwdriver-wrench" href="https://smith.langchain.com/" cta="Try LangSmith" />

      <Card title="Build an advanced agent with LangGraph" icon="robot" href="/oss/python/langgraph/quickstart" cta="Get started" />

      <Card title="Enroll in LangChain Academy" icon="graduation-cap" href="https://academy.langchain.com/" cta="Get started" />
    </CardGroup>

    <h2 class="flex whitespace-pre-wrap group font-semibold">Additional resources</h2>

    <CardGroup cols={4}>
      <Card title="Community forum" icon="messages" href="https://forum.langchain.com/" cta="Join">
        Ask questions, share solutions, and discuss best practices.
      </Card>

      <Card title="Community Slack" icon="slack" href="https://www.langchain.com/join-community" cta="Join">
        Connect with other builders and get quick help.
      </Card>

      <Card title="Support portal" icon="user-headset" href="https://support.langchain.com/" cta="Visit">
        Submit tickets and track support requests.
      </Card>

      <Card title="LangSmith status" icon="screwdriver-wrench" href="https://status.smith.langchain.com/" cta="View">
        Real-time status of LangSmith services and APIs.
      </Card>
    </CardGroup>
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***

<Callout icon="pen-to-square" iconType="regular">
  [Edit the source of this page on GitHub.](https://github.com/langchain-ai/docs/edit/main/src/index.mdx)
</Callout>

<Tip icon="terminal" iconType="regular">
  [Connect these docs programmatically](/use-these-docs) to Claude, VSCode, and more via MCP for real-time answers.
</Tip>