The "Cognitive Interface": Beyond UI and API

For decades, software engineering has focused on two primary interfaces: User Interface (UI): Optimized for human perception—visual, intuitive, and interactive. Application Programming Interface (API): Optimized for machine perception—structured, typed (REST, gRPC), and deterministic. But as we enter the era of Autonomous Agents, a massive gap has appeared. An AI Agent is neither a human nor a traditional program. It is a Cognitive Caller. It doesn't just need to know what endpoint to hit;