SQL Server Agent has a 512 characters limit on texts fields like nvarchar(max). I found this out after seeing my stored procedure is working correctly when I run it in SSMS
Hear my plea MS. Be kind to our eyes and allow us to increase the SQL Agent font size.
I use a sysinternals tool called ZoomIt. Pressing [Control] + [1] takes a snapshot of the screen and zooms in to various magnifications. It's a far cry from increasing the Agent job & steps, but works in a pinch.
Another work around is to return the job or it's steps in a query window.
select subsystem, step_id, step_name, command from sysjobsteps where job_id in
(select job_id from sysjobs where name like '%Some Job with tiny screen letters%')