> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-update-1770920925-e15dbde.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# LangSmith docs

**LangSmith provides tools for developing, debugging, and deploying LLM applications.**
It helps you trace requests, evaluate outputs, test prompts, and manage deployments in one place.
LangSmith is framework agnostic, so you can use it with or without LangChain's open-source libraries
[`langchain`](/oss/python/langchain/overview) and [`langgraph`](/oss/python/langgraph/overview).
Prototype locally, then move to production with integrated monitoring and evaluation to build more reliable AI systems.

<Callout icon="bullhorn" color="#DFC5FE" iconType="regular">
  LangGraph Platform is now [LangSmith Deployment](/langsmith/deployments). For more information, check out the [Changelog](https://changelog.langchain.com/announcements/product-naming-changes-langsmith-deployment-and-langsmith-studio).
</Callout>

## Get started

<Steps>
  <Step title="Create an account" icon="user-plus">
    Sign up at [smith.langchain.com](https://smith.langchain.com) (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>

  <Step title="Choose your integration" icon="plug">
    LangSmith works with many frameworks and providers including OpenAI, Anthropic, CrewAI, Vercel AI SDK, Pydantic AI, and more.
    Browse [available integrations](/langsmith/integrations) to connect your stack.
  </Step>
</Steps>

Once your account and API key are ready, choose a quickstart to begin building with LangSmith:

<Columns cols={3}>
  <Card title="Observability" icon="magnifying-glass" href="/langsmith/observability-quickstart" arrow="true" cta="Start tracing">
    Gain visibility into every step your application takes to debug faster and improve reliability.
  </Card>

  <Card title="Evaluation" icon="chart-line" href="/langsmith/evaluation-quickstart" arrow="true" cta="Evaluate your app">
    Measure and track quality over time to ensure your AI applications are consistent and trustworthy.
  </Card>

  <Card title="Deployment" icon="cloud-arrow-up" iconType="solid" href="/langsmith/deployments" arrow="true" cta="Deploy your agents">
    Deploy your agents as Agent Servers, ready to scale in production.
  </Card>
</Columns>

### More ways to build

<Columns cols={2}>
  <Card title="Platform setup" icon="server" iconType="solid" href="/langsmith/platform-setup" arrow="true" cta="Choose how to set up LangSmith">
    Use LangSmith in managed cloud, in a self-hosted environment, or hybrid to match your infrastructure and compliance needs.
  </Card>

  <Card title="Studio" icon="window" href="/langsmith/quick-start-studio" arrow="true" cta="Develop with Studio">
    Use a visual interface to design, test, and refine applications end-to-end.
  </Card>

  <Card title="Prompt testing" icon="flask" href="/langsmith/prompt-engineering-quickstart" arrow="true" cta="Test your prompts">
    Iterate on prompts with built-in versioning and collaboration to ship improvements faster.
  </Card>

  <Card title="Agent Builder" icon="sparkles" href="/langsmith/agent-builder" arrow="true" cta="Build an agent">
    Design and deploy AI agents visually with a no-code interface—perfect for rapid prototyping and getting started without writing code.
  </Card>
</Columns>

<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>

## Workflow

LangSmith combines observability, evaluation, deployment, and platform setup in one integrated workflow—from local development to production.

<img className="block dark:hidden" src="https://mintcdn.com/langchain-5e9cc07a-preview-update-1770920925-e15dbde/bUlJWtRXnLZErfNZ/langsmith/images/overview-light.svg?fit=max&auto=format&n=bUlJWtRXnLZErfNZ&q=85&s=672fad80d6c9b901dcc96418413b210d" alt="Diagram showing how LangSmith integrates observability, evaluation, deployment, and platform setup in a single workflow from development to production." width="1138" height="549" data-path="langsmith/images/overview-light.svg" />

<img className="hidden dark:block" src="https://mintcdn.com/langchain-5e9cc07a-preview-update-1770920925-e15dbde/bUlJWtRXnLZErfNZ/langsmith/images/overview-dark.svg?fit=max&auto=format&n=bUlJWtRXnLZErfNZ&q=85&s=cdd08fdd76d4ab5887353a5b1fa0df0f" alt="Diagram showing how LangSmith integrates observability, evaluation, deployment, and platform setup in a single workflow from development to production." width="1157" height="549" data-path="langsmith/images/overview-dark.svg" />

***

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

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