Tool use is the capability of AI agents to invoke external functions, APIs, and services during conversations. It enables agents to access information and perform actions beyond their training, connecting conversations to real business systems.
How does tool use work?
The AI is provided with descriptions of available tools, including their purposes and parameters. During conversation, it decides when tools are needed, formulates appropriate calls, and incorporates results into responses. This enables dynamic access to current data and real-time action execution.
Why does tool use matter?
Language models alone can only generate text based on training. Tool use gives them access to current information and the ability to affect external systems. Looking up account details, checking availability, processing transactions, and updating records all require tool use.
Tool use in practice
A caller asks “When is my next appointment?” The AI uses the lookup_appointments tool with the caller’s ID, retrieves their scheduled appointment from the database, and responds: “Your next appointment is Thursday at 2:30pm with Dr. Martinez. Would you like to reschedule or make any changes?” The tool provided information the AI could not have known otherwise.