SQLAgentReaderRole
The SQLAgentReaderRole is a database role located in the msdb database. It is one of three new roles in this database aimed at allowing the database administrator the ability to assign more granular permissions when it comes to the administration of SQL Agent jobs. Assigning a user or group to be a member of this role allows the user to see any SQL Agent job located on the server instance, even the jobs in which that user does not own. The user can see the job, along with any history saved to the job. However, the group is not allowed to execute the jobs. To add a user as a member of the SQLAgentReaderRole, you can execute the following command:
use msdbEXECUTE sp_addrolemember@rolename = 'SQLAgentReaderRole',@membername = 'username' It is also worth mentioning the other two SQL Agent roles available in SQL Server 2005. The SQLAgentUserRole allows users to create jobs and to manage the jobs that they create. The SQLAgentOperatorRole allows users all of the rights assigned to the SQLAgentReaderRole along with the permissions necessary to execute local jobs that they do not own.
Further you can view some more details in this below blog:
http://blogs.techrepublic.com.com/datacenter/?p=428
