How can I check if my automated designed reinforcement is OK or not?

There are several ways to do that: 

First of all, the design command "Reinforcement design" should already design the cross-section for you and in case that one of the detailing rules is not respected like the min spacing between the bars, the EWN system will do the necessary explanation. (EWN = Error, Warning & Note).

Beside that, the user has some other tools to help him: 

UC (As,max) = comparing As,req or As,prov. with As max. The value should be less than one (Green).

UC (As,req) = Comparing the As,req with As,prov. The value should be less than one (Green).​

Moreover, the user can always use the individual checks for ULS + SLS to be sure that everything is ok. 

 ​