The phrase "perfect description" means that something has been explained or depicted very accurately and clearly, leaving no room for confusion or doubt. Full definition
When you're job hunting, there's a good chance you'll find the job listings that sound like perfect descriptions of your background. (blog.gojobhero.com)
Couldn't be more perfect description about your outfit and so lovely story. (theadoredlife.com)
The way to do it right is to perfect the description copy and customize the screenshots. (entrepreneur.com)