Checking the validity of an STS token requires that you have a bona fide token first. Thus it’s not a “digital twin”; it is the real McCoy. And STS tokens are free.
There is no digital twin I’m aware of that is capable of simulating the real behavior of an EC2 instance. There are just too many variables to consider. To test instance launch and runtime behavior to a meaningful degree of certainty, you have to launch one first. And that means accepting the costs of doing that.
(I notice, too, that you appear to be executing the AWS CLI to do this. I’m not sure if that’s bad or not, but it smells a little fishy.)
There is no digital twin I’m aware of that is capable of simulating the real behavior of an EC2 instance. There are just too many variables to consider. To test instance launch and runtime behavior to a meaningful degree of certainty, you have to launch one first. And that means accepting the costs of doing that.
(I notice, too, that you appear to be executing the AWS CLI to do this. I’m not sure if that’s bad or not, but it smells a little fishy.)