You can use CSS attribute selectors Show archive.org snapshot in your step definitions like this:

Then /^the page should have a meta description "([^"]+)"$/ do |description|
  page.should have_css("meta[name=\"description\"][content=\"#{description}\"]")
end

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Note that you need to always quote attribute values or you will get a Nokogiri parsing error like this:

unexpected 'foo' after 'equal' (Nokogiri::CSS::SyntaxError)