What defines an AI agent?

An AI agent is defined as an entity that acts, uses tools, and has goals. This definition encapsulates the core characteristics of an AI agent, highlighting its capability to perform actions based on its objectives and the environment in which it operates. It not only involves executing tasks but also adapting to different situations and utilizing tools to achieve specific ends.

An AI agent's ability to act implies a level of autonomy and decision-making, which distinguishes it from mere data processing or response generation. While other options mention various forms of programs or functionalities, they do not encompass the proactive and goal-oriented nature of an AI agent. An effective AI agent seeks to accomplish particular tasks or results based on its design and programming, making it more than just a static program or a simple responding entity.