Before your next AI task, write one done-when line first. Then prompt. You're done when you've graded the output against your line — pass or fail, no vibes.
How-to · WFL · WFL.4
Define done-when before you prompt
Writing the acceptance criteria before prompting turns AI sessions from wandering chats into checkable work units.
Worked example
The prompt is not the start; the finish line is. Writing 'done-when' first — under 200 words, includes cost, no invented facts — turns a wandering chat into a work unit you can check. It's the single habit that separates users from operators.