I found that it is used only here:
https://github.com/yast/yast-ldap-server/blob/master/src/modules/LdapDatabase.rb#L1963 and https://github.com/yast/yast-ldap-server/blob/master/src/include/ldap-server/dialogs.rb#L1098
where it uses "summary" and "description" keys, but it is special agent, so it is questionable what is expected to get from common agent???

And from documentation in Scripting agent and SCR Component I don't get anything useful. Do you have idea where it can live?