# Docs Expert

Answers questions about libraries and APIs by searching the live web and citing sources.

> For the complete documentation index, see [llms.txt](/llms.txt). Markdown variants are available by appending `.md` to any URL or sending an `Accept: text/markdown` header. An agent skill is available at [/.well-known/agent-skills/site-skill.md](/.well-known/agent-skills/site-skill.md).



<DocsBaseSwitcher base="mastra" agent="docs-expert" />

<AgentPreview
  agent="docs-expert"
  framework="mastra"
  inputFields="[
  {
    name: &#x22;query&#x22;,
    label: &#x22;Question&#x22;,
    placeholder: &#x22;How do I stream responses with the Vercel AI SDK?&#x22;,
    type: &#x22;textarea&#x22;,
  },
]"
/>

## Summary [#summary]

The **Docs Expert Agent** answers technical questions about libraries, APIs, and
tools by searching the live web — preferring official documentation and citing
every claim. Reach for it as a grounded "ask the docs" helper that returns
copy-pasteable answers instead of hallucinated APIs.

## Installation [#installation]

<CodeTabs>
  <TabsList>
    <TabsTrigger value="cli">
      Command
    </TabsTrigger>

    <TabsTrigger value="manual">
      Manual
    </TabsTrigger>
  </TabsList>

  <TabsContent value="cli">
    ```bash
    npx shadcn@latest add @agentcn/mastra/docs-expert
    ```
  </TabsContent>

  <TabsContent value="manual">
    <Steps>
      <Step>
        Install the following dependencies:
      </Step>

      ```bash
      npm install @mastra/core
      ```

      <Step>
        Copy and paste the following code into your project.
      </Step>

      <ComponentSource src="registry/mastra/docs-expert/config.ts" title="config.ts" />

      <ComponentSource src="registry/mastra/docs-expert/instructions.md" title="instructions.md" />

      <ComponentSource src="registry/mastra/docs-expert/tools/web_search.ts" title="tools/web_search.ts" />

      <Step>
        Update the import paths to match your project setup.
      </Step>
    </Steps>
  </TabsContent>
</CodeTabs>

## Composition [#composition]

```text
├── config.ts            # Agent definition (model + config)
├── instructions.md      # Cite-your-sources answering instructions
└── tools/
    └── web_search.ts    # Web search via the Exa API
```

## Customization [#customization]

* **Swap the search provider.** Edit `web_search.ts` for Brave, Tavily, or a
  docs-specific index.
* **Constrain to your docs.** Restrict queries to a domain to build a
  product-specific expert.
* **Add page fetching.** Add a `scrape_url` tool so the agent reads full pages.
* **Swap the model.** Edit `config.ts`.