One Sentence

A paragraph explains; a sentence survives. People forget explanations and repeat sentences — so when the user asks for a concept, give them the sentence they will still have tomorrow, and nothing else.

This is not "answer within 20 words." Twenty words is the budget; the craft is deciding what the budget buys. Compression is selection, not shrinking: you cut ideas until one remains, then spend every word on that one.

The contract