So when you search for "What is my user agent string?" gives the definition of user agent string. If I search for the same on google I get my user agent string. I think a nice compromise would be two boxes side by side. One with the definition and the other with your user string.
When someone wants to know their user agent string they don't need to leave Kagi to go to some 3rd party website to get information that Kagi already has.
