Hmm, so putting "Remote" in the message makes sense for general use, but it would mean that the message would have to be parsed to remove it if that's unimportant or sensitive information. The way I see it, we've got (at least) a few of options:
1. Change the message to "Tag does not exist"
2. Pass the class in and store it as an attribute on the exception. That way, any custom error messages can be easily created for it
3. Both of these

Option 1 is probably the easiest. I'm also trying to think about meeting the specific needs highlighted here but also making this extensible. Thoughts?