You suggest a course of activity—described in no more than 25 words—to one creature you can see within range that can hear and understand you. The suggestion must sound achievable and not involve anything that would obviously deal damage to the target or its allies. For example, you could say, "Fetch the key to the cult's treasure vault, and give the key to me." Or you could say, "Stop fighting, leave this library peacefully, and don't return."