Tool use is the paradigm where an LLM extends its capabilities by calling external tools — APIs, functions, databases, calculators, web browsers — to do things it couldn't do alone. One of the most important properties of modern LLMs is that they are trained for tool calling: the model sees a tool description, decides which one to invoke and with what arguments, then reads the result and shapes its reply around it. OpenAI productised this with Function Calling in June 2023, after which Anthropic, Google and others followed with their own variants. Tool use is the core mechanism that makes Agent systems actually useful — the bridge from pure text generation to real-world impact.
MEVZU N°124ISTANBULYEAR I — VOL. III
Glossary · Intermediate · 2023
Tool Use
An LLM extending its capability by calling external tools, APIs or functions.
- EN — English term
- Tool Use
- TR — Turkish term
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