For an AI agent, tool use signifies the ability to interact with and leverage external systems, software, or physical implements to augment its inherent capabilities. This extends beyond simple data processing, allowing the AI to call upon specialized functions like web search APIs, calculators, code interpreters, or even robotic effectors. The primary goal is to overcome limitations in its own knowledge base or processing power, enabling it to access real-time information, perform complex computations, or execute actions in the physical world. It represents a crucial step towards more adaptable and versatile AI, facilitating tasks such as: