Does Xcode save your answer to the system when agreeing to the License Agreement? Upon installing Xcode, it prompts a license agreement. When you press agree, you are never prompted the license agreement again. Does your answer get saved to the system, that way the application does not ask you again? If so, where does the system save the file to?
When you agree to the Xcode license, an entry is created in:

/Library/Preferences/com.apple.dt.Xcode.plist


As shown in the image below:



Or from Terminal using the defaults command:

$ defaults read /Library/Preferences/com.apple.dt.Xcode.plist 
{
    IDELastGMLicenseAgreedTo = EA1478;
    IDEXcodeVersionForAgreedToGMLicense = "9.4.1";
}
$