Question

Where do I look in Microsoft SQL Server system tables to find info about the parameters a builtin stored procedure or function takes?

Answer 1

Looks like a join on sys.system_objects and sys.system_paramters will do it. This should get you started:

SELECT ob.object_id, ob.name, ob.is_ms_shipped, ob.type_desc, pa.*
 from sys.system_objects ob
  inner join sys.all_parameters pa
   on pa.object_id = ob.object_id

Reset with the columns you’re interested in and you should be good.

Make it a left outer join to pick up objects that have no parameters.