ELI5: tool calling
// explanation
What is tool calling?
Tool calling is like giving an AI assistant a phone book of helpful tools it can use to answer your questions [1][5]. Instead of just talking, the AI can ask to use a calculator, look up information online, or send a message when it needs to [1].
Why does the AI need tools?
Sometimes an AI doesn't know the answer or can't do something with just words—like checking today's weather or doing a complicated math problem [5]. Tools let it get real information and do real things in the world [1].
How does it actually work?
The AI is taught to write special instructions in a particular format, like saying "use the calculator tool with these numbers" [4]. The computer reads what the AI wrote, runs the actual tool, and tells the AI what happened so it can answer your question [3].
Can every AI do this?
Not all AIs are trained to use tools—some are really good at it and some don't even have this ability [2]. The AI has to be specifically taught how to format its requests for tools to work properly [2].
// sources
Tool calling refers to the ability of artificial intelligence (AI) models to interact with external tools, application programming interfaces (APIs) or systems ...
Jun 14, 2025 ... Tool calling depends on the model. Some have it, some don't. Some declare support for tool calling but they work poorly.
. Calling a single tool. Invoke a single tool and include its response in a follow-up request. Also known as “single-shot” tool calling.
Feb 26, 2025 ... It's basically generate text in certain format that you can interpret later as function's name and parameters. Nothing fancy.
Tool calling (also known as function calling) is a common pattern in AI applications allowing a model to interact with a set of APIs, or tools, augmenting its ...
Video by IBM Technology
Video by Piyush Garg
Video by AnilTechAI
