> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-mdrxyd-1787874960-e422c7e.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">The open agent engineering ecosystem</h1>

    LangChain provides open source, model-agnostic harnesses for building agents. LangSmith is the framework-agnostic platform for testing, deploying, monitoring, and improving them across the agent development lifecycle. You control every layer of your agent system, and keep improving it with what you learn in production.

    <h2 class="flex whitespace-pre-wrap group font-semibold">Agent development lifecycle</h2>

    <CardGroup cols={2}>
      <Card title="Build" icon="hammer" href="/build-overview" cta="Get started">
        Build agents with code using LangChain, LangGraph, and Deep Agents.
      </Card>

      <Card title="Test" icon="flask" href="/langsmith/evaluation" cta="Get started">
        Evaluate agents with datasets, evaluations, and prompt engineering.
      </Card>

      <Card title="Deploy" icon="rocket" href="/langsmith/deployment" cta="Get started">
        Deploy and serve agents at scale.
      </Card>

      <Card title="Monitor" icon="chart-line" href="/langsmith/observability" cta="Get started">
        Trace, debug, and observe agents in production.
      </Card>
    </CardGroup>

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

    <CardGroup cols={2}>
      <Card title="LLM Gateway" icon="route" href="/langsmith/llm-gateway" cta="Get started">
        Route, control, and observe LLM traffic across providers.
      </Card>

      <Card title="No-code agents" icon="wand" href="/langsmith/fleet" cta="Get started">
        Build and run agents without code using LangSmith Fleet.
      </Card>

      <Card title="Engine" icon="https://mintcdn.com/langchain-5e9cc07a-preview-mdrxyd-1787874960-e422c7e/GMudGq5gQB1TAKib/images/brand/engine-icon-no-bg-dark.svg?fit=max&auto=format&n=GMudGq5gQB1TAKib&q=85&s=87c46a483156ac41092793d4433bfa9a" href="/langsmith/engine-overview" cta="Get started" width="63" height="63" data-path="images/brand/engine-icon-no-bg-dark.svg">
        Find and fix recurring agent issues automatically with LangSmith Engine.
      </Card>

      <Card title="Deep Agents Code" icon="code" href="/oss/deepagents/code/overview" cta="Get started">
        Code with an AI agent in your terminal using the open source `dcode` CLI.
      </Card>
    </CardGroup>

    <h2 class="flex whitespace-pre-wrap group font-semibold">Setup and governance</h2>

    <CardGroup cols={2}>
      <Card title="LangSmith setup" icon="server" href="/langsmith/platform-setup" cta="Get started">
        Set up LangSmith on Cloud, BYOC, or Self-hosted.
      </Card>

      <Card title="Govern" icon="shield-check" href="/langsmith/govern-overview" cta="Get started">
        Manage users, access control, policies, and compliance across your organization.
      </Card>
    </CardGroup>

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

    <CardGroup cols={3}>
      <Card title="LangChain Academy" icon="school" href="https://academy.langchain.com/" cta="Enroll">
        Take free courses on building and improving agents with LangSmith and our open-source frameworks.
      </Card>

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

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

      <Card title="Sign up for LangSmith" icon="tools" href="https://smith.langchain.com/" cta="Sign up">
        Start with LangSmith for free.
      </Card>

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

      <Card title="Trust Center" icon="shield-lock" href="https://trust.langchain.com/" cta="View">
        HIPAA, SOC 2 Type 2, and GDPR compliance details.
      </Card>
    </CardGroup>
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