Start Sql Server agent when sql server starts Is it possible to automatically start the agent when sql server starts? 

When you boot the server than both windows services get started.

But when you stop the main sql server service agent also gets stopped. The problem is that the reverse is not true.  When you start the main sql server windows service again than agent wont be started automatically. 
This tends to be forgotten a lot here.

Is there a way to start agent as a consequence of starting sql server?
There are couple of steps that you can do to address the problem that you faced :


Have a startup stored procedure using sp_procoption that runs and checks and alerts you that SQL Agent is not running.

IF EXISTS (  SELECT 1 
       FROM MASTER.dbo.sysprocesses 
       WHERE program_name = N'SQLAgent - Generic Refresher')
BEGIN
 SELECT @@SERVERNAME AS 'InstanceName', 1 AS 'SQLServerAgentRunning'
END 
ELSE 
BEGIN
EXEC msdb.dbo.sp_send_dbmail
@profile_name = 'yourDBMailProfile',
@recipients = 'dbateam@somecompany.com',
@body = 'Please check the status of SQL Agent. It is not running !',
@query = 'SELECT @@SERVERNAME AS [InstanceName], 0 AS [SQLServerAgentRunning]',
@subject = 'SQL Agent is not running',
@attach_query_result_as_file = 0 ; -- set it to 1 to receive as txt file attachment
END

Set SQL Agent service to restart