“Make three interesting sounds” leaves plenty of freedom, but it may not communicate the piece you imagined. A tiny instruction score lets you decide where precision matters and where another person can choose.
Specify actions that can be performed
Try an original exercise: tap a tabletop softly twice, wait for one quiet breath, then rub a sheet of paper once. Use ordinary objects safely and avoid sharp impacts or uncomfortable volume. State whether the performer may choose the pace and whether the sequence repeats.
Listen to a willing reader’s version
Ask someone who wants to participate to follow only the instructions. Notice which differences reflect genuine choice and which came from unclear wording. Do not treat every unexpected interpretation as a mistake; it may show where your score is open.
Revise one instruction and compare again. Keep both versions with a short note about what changed. This is composition through directions: the score does not reproduce a recording exactly, but it can communicate relationships between actions, pauses and choices well enough for another person to make the piece their own.