Example: Adding a Calculator to Our Agent › Looking Ahead

You now have a working agent with tool use capabilities. This is a significant milestone. Your agent is no longer limited to its training data. It can:

• Perform exact calculations
• Access external information
• Take actions in the world

In the next chapter, we'll explore memory and retrieval. You'll learn how to give your agent the ability to remember conversations, store facts, and recall information when needed. Combined with tool use, this will make your agent far more capable and useful.

The calculator example we built here is simple, but the pattern scales. Whether you're adding a weather API, a database query tool, or a complex business logic function, the approach is the same. Define the function, describe it clearly, register it, and let the agent decide when to use it.

This is how modern AI agents work. They combine language understanding with the ability to use tools, creating systems that can reason and act in the world.