> ## Documentation Index
> Fetch the complete documentation index at: https://mcp-b-sync-npm-packages-docs-bf03420.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# @mcp-b/extension-tools overview

> When to use the Chrome extension tool classes, how they differ from browser-page runtimes, and how they relate to other tooling packages.

`@mcp-b/extension-tools` packages Chrome Extension APIs as MCP tool classes. It is the package to use when you are writing a Chrome extension and want to expose tabs, bookmarks, history, storage, or scripting capabilities to an MCP client.

## When to use this package

* You are building an extension background script or related extension runtime.
* You want prebuilt tool classes instead of manually wrapping Chrome APIs.
* You need extension-specific capabilities that a webpage runtime cannot provide.

## When not to use this package

* You are exposing tools from a normal webpage. Use [`@mcp-b/global`](/packages/global/overview) or [`@mcp-b/webmcp-polyfill`](/packages/webmcp-polyfill/overview).
* You need DOM extraction only. Use [`@mcp-b/smart-dom-reader`](/packages/smart-dom-reader/overview).

## Where it sits in the package graph

This package is part of the tooling layer rather than the page runtime stack. Some classes depend on [`@mcp-b/smart-dom-reader`](/packages/smart-dom-reader/overview) for DOM-focused extraction behavior.

## First step

Create an MCP server in your extension runtime, then register only the tool classes you want to expose. The [reference page](/packages/extension-tools/reference) groups the API tool classes and their option surfaces.

## Related pages

<CardGroup cols={2}>
  <Card title="Reference" icon="book-open" href="/packages/extension-tools/reference">
    Tool classes, option tables, and extension integration details.
  </Card>

  <Card title="@mcp-b/smart-dom-reader overview" icon="code" href="/packages/smart-dom-reader/overview">
    DOM extraction utility used by several extension workflows.
  </Card>

  <Card title="@mcp-b/chrome-devtools-mcp overview" icon="chrome" href="/packages/chrome-devtools-mcp/overview">
    Alternative tooling when you want a DevTools bridge instead of an extension.
  </Card>

  <Card title="Framework guide" icon="code" href="/how-to/frameworks">
    Runtime guidance for webpage-facing packages when you are not in an extension context.
  </Card>
</CardGroup>