Tool Use (Function Calling)

Tool use is the moment an AI assistant stops talking and starts doing.

When a chat needs something the model can't produce on its own — a live price, a calendar slot, a booked meeting — it calls out to an external tool or app and uses what comes back. That call is the trigger that fires your app inside the conversation.

For your funnel, tool use is the difference between being mentioned and being chosen.

Why it matters for the ChatGPT funnel

Showing up in an AI answer is not the same as getting picked.

A buyer can read your name in a paragraph and move on. Nothing happens. But when the assistant decides to call your tool, the buyer is now inside your flow — comparing, qualifying, ready to book.

That call is the handoff from visibility to pipeline. It only fires when the assistant judges your tool the best way to finish the job, and only at real intent, not idle curiosity. Win the call and you own the conversion moment. Miss it and you're back to a brand mention that leaks demand.

How drio fits

drio is the app the assistant calls when a buyer hits buying intent. We build the tool the model fires — a drio app that gets picked, qualifies the lead, and books the meeting inside the chat. Tuning your app to win that call instead of a competitor's is what we mean by Connector Engine Optimization: being the tool the assistant reaches for at the moment of intent.