fix(serper-dev): restore search localization parameters

[beowolx]

Fix: Restore Search Localization Parameters in SerperDevTool

Co-Authored-By: @Rolando-B

Issue

The previous enhancement PR #147 inadvertently removed crucial search localization parameters (country, location, locale) from the SerperDevTool class. These parameters are essential for users who need to perform geographically targeted searches.

Changes

• Restored the following parameters to SerperDevTool:
  • country (maps to gl in Serper API)
  • location (for city-specific searches)
  • locale (maps to hl in Serper API)
• Updated payload construction in _make_api_request to include these parameters
• Updated usage examples to demonstrate localization parameters

Why

These parameters are crucial for:

1. Getting region-specific search results (via country)
2. Targeting searches to specific cities (via location)
3. Getting results in specific languages (via locale)

[joaomdmoura]

Disclaimer: This review was made by a crew of AI Agents.

Code Review Comment for PR #197: Restore Search Localization Parameters

Overview

This pull request aims to restore previously removed localization parameters (country, location, locale) to the SerperDevTool class. These changes enhance users' ability to perform region-specific searches, which improves the tool's overall utility.

Positive Aspects

• The implementation employs clear type hints using Optional[str] for new parameters, which enhances code readability.
• The parameter naming (country, location, locale) is consistent and logical, aiding in understanding their purpose.

Code Quality Findings

1. JSON Payload Construction Correction

   • The current implementation incorrectly attempts to modify a JSON string directly:

   payload = json.dumps({"q": search_query, "num": self.n_results})
   if self.country != "":
       payload["gl"] = self.country  # This will cause an error since payload is a string

   • Recommended Fix:

   payload = {
       "q": search_query,
       "num": self.n_results
   }
   if self.country:
       payload["gl"] = self.country
   if self.location:
       payload["location"] = self.location
   if self.locale:
       payload["hl"] = self.locale
   payload = json.dumps(payload)

2. Parameter Validation Addition

   • Implementing validation is critical. The absence of checks can lead to runtime errors if invalid parameters are passed.
   • Add the validation check like this:

   def _validate_parameters(self):
       if self.country and not isinstance(self.country, str):
           raise ValueError("Country parameter must be a string")
       if self.location and not isinstance(self.location, str):
           raise ValueError("Location parameter must be a string")
       if self.locale and not isinstance(self.locale, str):
           raise ValueError("Locale parameter must be a string")

3. Default Values Improvement

   • Changing the initialization of optional parameters to use None instead of empty strings will improve the logic around checking their presence.

   country: Optional[str] = None  # Recommended approach
   if self.country is not None:
       payload["gl"] = self.country

Documentation Recommendations

README.md

The documentation has been updated to reflect the new parameters. However, enhancements can be made:

• Parameter Documentation Table

  • Include a summary table with descriptions, types, and possible values for the new parameters:

  | Parameter | Type | Default | Description |
  |-----------|------|---------|-------------|
  | country | str | None | Two-letter country code (e.g., "us", "uk") |
  | location | str | None | Specific location for search targeting |
  | locale | str | None | Language/locale code (e.g., "en-US") |

• Usage Example

  • Provide users with specific usage examples:

  tool = SerperDevTool(
      country="uk",
      location="London",
      locale="en-GB"
  )
  results = tool.run("best fish and chips")

General Recommendations

• Input validation and error handling should be implemented robustly to catch invalid values early. Ensure that country codes conform to two-letter ISO standards.
• Add comprehensive unit tests to validate the behavior of the new parameters against a wide range of potential inputs and scenarios.
• Considerations for security must also be made, especially around input sanitization to prevent vulnerabilities related to user-supplied data.

Final Thoughts

The changes made in this pull request are significant for the functionality of the SerperDevTool. Adhering to these code quality practices will ensure that the added features not only improve functionality but also maintain the robustness and safety of the codebase. By implementing the recommended changes, we can enhance the user experience while ensuring maintainable, clean code.

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This review provides insights based on the analysis of the code changes and emphasizes best practices for future enhancements. Please feel free to ask for further clarification or additional details if needed.

[beowolx]

Worth mentioning that those parameters, which were removed, still present in the official doc: https://docs.crewai.com/tools/serperdevtool#parameters

[beowolx]

I amend my last commit to add unit tests and fix a small bug.