We don't need a Job Description Language, jobs can already be scripted out to T-SQL stored procedure commands. Likewise no need for a special Server Description Language; there are stored procedure calls for creating other non-ANSI objects like linked servers, replication, and server settings. Whatever happens in the background whenever we right-click on an object in SSMS and choose 'Script as..', a DDL comparison / sync tool can leverage that same process for comparison and deployment.