When to violate YAGNI? [closed]

Answer 1

Structuring your program well (abstraction, etc) isn't something that YAGNI applies to. You always want to structure your code well.

Just to clarify, I think your current predicament is due to over application of YAGNI. Structuring your code in such a way that you have a reusable library for using this protocol is just good programming practice. YAGNI does not apply.

Answer 2

I think it's pretty simple and obvious:

Violate YAGNI when you know that, in full certainty, You Are Going To Need It