Module 2 · Tool use

An LLM by itself can only describe the world; tools let it act on it. By the end of this module you will know what a tool is, how its schema is the contract the model reads, how the model decides when to call one, how the model→tool→model loop produces a grounded answer, and how to route between several tools and handle their failures.

1What is a tool?A tool is a function you let the model call by name to do real work — math, a database lookup, a web search, an email send. Without tools the model has… 6 min

2Function schemas: the contract the model readsThe model never sees your function's source code. It sees a schema: a name, a plain-English description, and a typed parameter list. From that schema… 7 min

3How the model decides to call a toolOn each turn the model looks at the conversation and the available tool descriptions and makes one decision: answer directly, or emit a tool call? You… 8 min

4The tool loop (and when a tool fails)Giving the model a tool means calling it more than once. The cycle is: model decides → platform runs the tool → result goes back to the model → model… 8 min

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