How can I get a custom job name for transactional replication?

I am trying to set up transactional replication.  I want to specify a job name for my agents because I want the names to have meaning.  (Unlike the names Microsoft makes up if I leave it to default.) I am defining the job with:

    exec msdb.dbo.sp_add_job 
        @job_name='Replication - AdventureWorks2012 Log Reader Agent', 
        @enabled=1, 
        @notify_level_eventlog=2, 
        @notify_level_email=1, 
        @notify_level_netsend=0, 
        @notify_level_page=0, 
        @delete_level=0, 
        @description='AdventureWorks2012 Log Reader Agent', 
        @category_name='REPL-LogReader', 
        @owner_login_name='sa';

Then I attempt to define the agent with 

    exec sys.sp_addlogreader_agent 
        @job_name = 'Replication - AdventureWorks2012 Log Reader Agent',
        @publisher_security_mode = 1;

And I get...

The specified Logreader Job ('Replication - AdventureWorks2012 Log Reader Agent') does not exist.

If I comment out the @job_name parameter - an agent does get defined.

What am I doing wring here?

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John