fix: improve error message when beautifulsoup4/lxml not installed for load_web_page

[brucearctor]

Description

The built-in load_web_page tool requires beautifulsoup4 and lxml, which are available via the [extensions] optional dependency group. When a user installs google-adk without the [extensions] extra and calls load_web_page, they get a raw ModuleNotFoundError: No module named 'bs4' with no guidance on how to resolve it.

This change wraps the deferred imports in a try/except to provide a clear, actionable error message:

ImportError: load_web_page requires the "beautifulsoup4" and "lxml" packages.
Install them with: pip install google-adk[extensions]

Fixes #4852

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the user experience for the load_web_page tool by replacing a generic ModuleNotFoundError with a specific and helpful ImportError. This change ensures that users who call load_web_page without the necessary beautifulsoup4 and lxml dependencies receive clear instructions on how to resolve the issue, streamlining the setup process and reducing potential frustration.

Highlights

• Improved Error Handling: Wrapped the beautifulsoup4 and lxml imports in load_web_page with a try/except block to catch ImportError.
• Actionable Error Message: Provided a clear and actionable ImportError message guiding users to install the beautifulsoup4 and lxml packages via pip install google-adk[extensions] when they are missing.

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Changelog

• src/google/adk/tools/load_web_page.py
  • Added a try/except block to handle ImportError for beautifulsoup4 and lxml.
  • Introduced a custom ImportError message with installation instructions.

Activity

• No human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request improves the error handling in load_web_page for cases where optional dependencies are not installed. It wraps the imports of beautifulsoup4 and lxml in a try-except block. If an ImportError is raised, it is caught and a new ImportError is raised with a more informative message that instructs the user on how to install the required packages. The change is correct and improves the user experience by providing clear, actionable guidance.

[adk-bot]

Response from ADK Triaging Agent

Hello @brucearctor, thank you for your contribution!

Before we can merge this pull request, we need you to sign our Contributor License Agreement (CLA). You can do so by following the instructions in the "cla/google" check at the bottom of the pull request.

This is a one-time process and is required for all contributions to Google open source projects. Thanks!

[brucearctor]

should now be sorted :-)