ADDing agent-context annotations for existing API specs A new open standard called ADD (AI Device Description) enables IoT devices to publish a single JSON document at a well-known endpoint, allowing AI systems to read the device's capabilities, constraints, and safety rules without custom integration or cloud services. The standard embeds safety directly into device descriptions, treating AI models as risk factors and requiring deterministic behavior for hardware control. ADD aims to make any HTTP-capable device AI-ready while keeping the user in control through layered safety and ethical frameworks. A lightweight open standard that enables IoT devices to describe themselves to AI systems — safely, completely, and without great effort. ADD AI Device Description gives any HTTP-capable IoT device a voice. The device publishes a single JSON document at a well-known endpoint — its self-description. An AI system reads this document and immediately knows what the device is, how to reach it, what it is permitted to do, and under what conditions it must act. No custom integration. No cloud service. No prior knowledge required. http://