A device has a biometric sensor, a display, a light source, and a hardware processor. The biometric sensor measures biometric information of a user of the device. The display displays augmented reality (AR) content. The light source outputs a visual signal. The hardware processor performs operations comprising: identifying a task being performed by the user of the device, determining a disruption level based on a combination of the AR content, the task, and the biometric information, and generating, using the light source, the visual signal corresponding to the disruption level. The visual indicator visually alerts other users of other devices to avoid engaging the user of the device.