Pick a real quality-engineering task, write the prompt you'd actually use, and grade it against an authored checklist of what a strong prompt for that task carries — then compare with the model answer. Eight drills, free. Nothing you type leaves your browser.
All eight drills, the rubric grading, and every model answer are free and stay free. The Coach's Edition adds the layer a checklist can't: why each signal matters, the mistake almost everyone makes on that drill, and where the grader itself is blind.
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