Comparison
Agent vs Tool Use
Agent and Tool Use are both common AI/LLM terms but cover different ideas. Here is a quick side-by-side.
When you would reach for Agent
Agent comes up when the question is fundamentally about agents & tools.
Claude Code — coding agent that edits files, runs commands, runs tests.
When you would reach for Tool Use
Tool Use comes up when the question is fundamentally about agents & tools.
Calling get_weather(city) and getting back JSON the model interprets.
Frequently asked
What is the difference between Agent and Tool Use?
Agent: An AI agent is an LLM-driven system that decides which actions to take, executes them via tools, observes the results, and iterates until a goal is met. Tool Use: Tool use is when an LLM can call external functions — APIs, code interpreters, databases, web fetchers — and read their results. The mechanism that turns chat into action.
When should I use Agent vs Tool Use?
Agent is the right concept when you are focused on agents & tools. Tool Use applies when you are focused on agents & tools.
Are Agent and Tool Use the same thing?
No. Agent is agents & tools; Tool Use is agents & tools. They are related but address different parts of the AI stack.