RFC speak is a good way to put it.

Also, there's a big difference between giving general "always on" context (as in agents.md) for vibe coding - like "validate against existing code" etc - versus bouncing ideas in a chat session like your example, where you don't necessarily have a specific approach in mind and burning a few extra tokens for a one off query is no big deal.

Context isn't free (either literally or in terms of processing time) and there's definitely a balance to be found for a given task.