SQL Express does NOT have Agent service

Even there's an "SQL Server Agent (SQLEXPRESS)" service inside the "SQL Server Services" list of Sql Server Configuration Manager, you can never be started it! All EXPRESS editions do NOT have Agent service. Refers to the "Features Supported by the Editions of SQL Server 2012".
http://msdn.microsoft.com/en-us/library/cc645993.aspx#Mgmt_tools