App Interface Guideline: Anti-Pattern — No Gesture-Only Actions. Keywords: gesture only hidden controls. Platform: iOS/Android/React Native. Description: Don't rely solely on hidden gestures for core actions. Do: Provide visible buttons in addition to gestures. Don't: Rely on swipe/shake only with no UI affordance. Good Example: Swipe to delete + visible Delete button. Bad Example: Only shake device to undo with no UI. Severity: Critical.