Introduction

When handling web page issues, the DeepSeek Harness (DSH) Agent usually can only rely on screenshots or natural-language descriptions, making it difficult to deeply investigate DOM structure, network requests, or script logic. BrowserScope embeds a complete Chromium DevTools workbench into DSH and provides the Agent with 30 dedicated tools. The Agent can now directly read page structure, operate elements, view the Console, track requests, set breakpoints, parse Source Maps, and record the before-and-after state of operations, moving from basic clicking and scrolling to deep breakpoint debugging and performance-bottleneck localization.

Plugin Positioning

This is a community plugin independently developed by HakureiMonika and compatible with DSH 0.1.5-rc.2. It does not modify the core code of DeepSeek Harness and supports coexistence with multiple plugins.

Installation and Configuration

Before installing, ensure the environment meets the following requirements:
* Node.js version: ^22.19.0 or >=24.0.0
* The DSH Web Profile has started successfully

Run the following command to install version 1.0.0-rc7:

dsh plugin --profile web add dsh-browser-scope@1.0.0-rc7 --ignore-scripts --config.auto-install-peers=false

Enable the plugin in the Profile’s cordis.patch.yml:

- insert:
    - id: browser-tools
      name: dsh-browser-scope

Core Capabilities

BrowserScope provides a toolset covering browsing, debugging, networking, performance, and other dimensions:

  • Browsing and operation: Supports tab management, page navigation, snapshot reading, element click/input/hover, scrolling, screenshots, file upload/download, and more.
  • Debugging and source code: Supports breakpoint control, step execution, call-stack viewing, variable reading, and Source Map resolution through the CDP Debugger.
  • Network monitoring: Captures Console logs, network request lists, and request/response bodies, and supports request interception, resending, mock responses, and automatic timeout recovery.
  • Diagnostics and performance: Supports saving Checkpoints and comparing them to generate diagnostic reports, collecting CPU/memory profiles, and analyzing traces.

Typical Usage

  • Identifying layout breakage: The Agent calls browser_snapshot to read the DOM structure and finds that a container’s display property has been modified by an asynchronous script. Then it uses browser_debugger together with the Source Map to locate the original code position and identifies a state-update timing issue.
  • Reconstructing online errors: The Agent uses browser_debugger to pause the script, reads the Source Map to map minified code back to the original file line and column (such as src/api/fetchUser.ts:23:15), and identifies missing error handling for asynchronous requests.
  • Capturing request override: The Agent calls browser_network_requests to capture the /api/user request and finds that two requests were issued simultaneously, but the earlier request’s response arrives 200 ms later, causing the newer request’s result to be overwritten.
  • Comparing page layouts: The Agent uses browser_split_view to load two pages with different Viewports simultaneously, reads the positions of key elements with browser_snapshot, and discovers that a mobile button is obscured.

Notes

  • Unofficial plugin: This is an independently developed community plugin, not a plugin released, maintained, or endorsed by DeepSeek.
  • Development status: The plugin is still under development. If you encounter a bug or an unexpected situation, please report it to the developer through an issue.
  • Session selection: Before using the browser for the first time in each formal Session, select BrowserScope in the “Browser” menu in the input area. Once selected, that Session remains locked to BrowserScope; other Sessions can make independent selections.
  • Upgrade notice: When upgrading from the legacy package dsh-browser-tools, remove the old package first. Keep id: browser-tools and $DSH_HOME/browser-tools, and do not install the two packages at the same time.

Summary

DSH BrowserScope gives the Agent browser debugging capabilities, addressing the pain point in web tasks where the Agent “can see but cannot precisely debug”. For DSH users who need to deeply investigate frontend issues or perform complex network operations, this is a practical toolbox. More details can be found in the GitHub repository.