The definition of plugin_description.xml is given as follows:

<library path="lib/librviz_telop_commander">
  <class name="rviz_telop_commander/Teleop"
         type="rviz_telop_commander::TeleopPanel"
         base_class_type="rviz::Panel">
    <description>
      A panel widget allowing simple diff-drive style robot base control.
    </description>
  </class>
</library>