> ## 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 Observability

> Instrument your LLM application, investigate traces, and monitor performance in production with LangSmith.

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  <div class="mdx-content prose prose-gray dark:prose-invert mx-4 pt-10">
    <h1 class="flex whitespace-pre-wrap group font-semibold text-2xl sm:text-3xl mt-8">LangSmith Observability</h1>

    LangSmith Observability provides full visibility into your LLM application: from individual traces to production-wide performance metrics.

    <Callout icon="plug" color="#4F46E5" iconType="regular">
      LangSmith works with many frameworks and providers. Browse [available integrations](/langsmith/integrations) to connect your stack including OpenAI, Anthropic, CrewAI, Vercel AI SDK, Pydantic AI, and more.
    </Callout>

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

    <Steps>
      <Step title="Create an account" icon="user-plus">
        Sign up at [smith.langchain.com](https://smith.langchain.com?utm_source=docs\&utm_medium=cta\&utm_campaign=langsmith-signup\&utm_content=snippets-langsmith-account-api-key-quickstart) (no credit card required).
        You can log in with **Google**, **GitHub**, or **email**.
      </Step>

      <Step title="Create an API key" icon="key">
        Go to your [Settings page](https://smith.langchain.com/settings) → **API Keys** → **Create API Key**.
        Copy the key and save it securely.
      </Step>
    </Steps>

    Once your account and API key are ready, set up tracing:

    <CardGroup cols={2}>
      <Card title="Set up tracing" icon="settings" href="/langsmith/observability-quickstart" arrow="true">
        Add tracing to your app in minutes with environment variables, framework integrations, or the SDK.
      </Card>

      <Card title="Trace a RAG application" icon="notebook" href="/langsmith/observability-llm-tutorial" arrow="true">
        Follow a step-by-step tutorial to instrument a retrieval-augmented generation app from start to finish.
      </Card>
    </CardGroup>

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

    <CardGroup cols={2}>
      <Card title="View traces" icon="route" href="/langsmith/filter-traces-in-application" arrow="true">
        Filter, export, share, and compare traces via the UI or API.
      </Card>

      <Card title="Monitor performance" icon="chart-area" href="/langsmith/dashboards" arrow="true">
        Build dashboards and set alerts to track quality and catch issues early.
      </Card>

      <Card title="Configure automations" icon="robot" href="/langsmith/rules" arrow="true">
        Automate workflows with rules, webhooks, and online evaluations.
      </Card>

      <Card title="Collect feedback" icon="users" href="/langsmith/attach-user-feedback" arrow="true">
        Annotate outputs and gather user feedback using queues or inline annotation.
      </Card>
    </CardGroup>

    <Card title="Find and fix failures with Engine" icon="https://mintcdn.com/langchain-5e9cc07a/auWE6_dMRp183OCf/images/brand/engine-icon-no-bg-dark.svg?fit=max&auto=format&n=auWE6_dMRp183OCf&q=85&s=dd41aef3ce789c1a04ea3c37b5903eac" href="/langsmith/engine-overview" arrow="true" width="63" height="63" data-path="images/brand/engine-icon-no-bg-dark.svg">
      Automatically detect recurring issues in your traces, diagnose their root cause, and resolve them with LangSmith Engine.
    </Card>

    For terminology and core concepts, refer to [Observability concepts](/langsmith/observability-concepts). For trace pricing, retention, and limits, see [Usage and billing](/langsmith/usage-and-billing).

    <Note>
      To set up a LangSmith instance, visit the [Platform setup section](/langsmith/platform-setup) to choose between cloud, hybrid, or self-hosted. All options include observability, evaluation, prompt engineering, and deployment.
    </Note>
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***

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    [Connect these docs](/use-these-docs) to Claude, VSCode, and more via MCP for real-time answers.
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    [Edit this page on GitHub](https://github.com/langchain-ai/docs/edit/main/src/langsmith/observability.mdx) or [file an issue](https://github.com/langchain-ai/docs/issues/new/choose).
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