I would really prefer to have no further communication with them. 

@Rob Gervais  Getting some 3D Renderings and basic floor plans with details could help communicate your thoughts to the GC which would ultimately save you money and also could help you get through the permit process.  

But, in our communications, she seemed to always assume I meant the worst. 

We lost communication with our contractor for weeks at a time, and given our proximity to the property were terrified of firing him because of the potential damage he and his team would cause, setting us even further behind. 

Communication is the key to success!

I was a week away from closing on a great place in Decatur city limits near downtown, but I couldn't get the HOA lady to communicate with us before we purchased, which was a bad sign and I walked.

Communication is always best.

Suddenly it is next to impossible to communicate.   

Does anyone have any idea why an agent will be uninterested in communicating about a property that would result in pretty big commission check?

As @Jordan Moorhead said, not communicating what you are looking for makes you sound inexperienced.Don't just buy a property for networking purposes.