I need to understand the purpose of the `YARD` gem and how to get started with it. Please navigate to the documentation for the `YARD` gem (any version will do for this task). Once on the `YARD` gem's documentation page, state its primary purpose and identify the command line instruction provided for getting started with YARD.
Navigate to 'https://rubydoc.info/'. Click on the 'RubyGems' link in the navigation menu. Fill the 'Search Gems' input field with 'yard'. Click the 'Search' button to submit the form. On the search results page, locate and click the link for the 'yard' gem (any version). Once on the 'yard' gem documentation page, locate and extract the primary purpose or description of the YARD gem. Locate and extract the command line instruction for getting started with YARD. State the primary purpose of the YARD gem and the command line instruction for getting started.
The agent successfully navigates to the RubyGems index page. The agent successfully uses the 'Search Gems' functionality by filling the input and clicking the submit button. The agent navigates to the documentation page for the 'yard' gem (URL should be similar to `https://rubydoc.info/gems/yard/` followed by a version number). The agent correctly identifies and states that YARD is 'a Ruby Documentation Tool'. The agent correctly identifies and states the command line instruction for getting started as 'gem install yard'.