Lesson 17 — Multiple tools

Picking the right tool

Real agents have several tools and the model picks one per step. Here we have three:

• calculator — exact maths (models often get arithmetic wrong).
• clock — the date and time (a model does not know what day it is). We freeze the time in NOW so the output is always the same.
• lookup — searches a small glossary (a dict of terms and meanings).

The model picks by name; your registry decides what actually exists. If the model asks for a tool that is not registered, the agent answers with an error instead of crashing.

Watch out: never run model text with eval() — that would let the model (or anyone who tricks it) run any code. The calculator below splits "12 * 7" into parts and only knows four operators.

Why it matters: more tools means more useful agents — and more need for clear names and a strict registry.