Function calling lets an AI model reach beyond its training data by invoking real tools — APIs, databases, calculations — in the middle of a conversation. The model decides which function to call and what arguments to pass, then weaves the live results into its response.

Callerbot is a demo of this pattern built around travel research: weather, forecasts, travel advisories, destination guides, local time, country intel, currency conversion, holidays, and more. Ask a question that fits a tool and Callerbot will call it. Ask something no tool covers and it will propose one, complete with parameters and a rationale.

Try a conversation like:
> "I'm thinking about visiting Thailand"
> "Is it safe?"
> "What's the weather like in Bangkok?"
> "How much is $500 in local currency?"
> "Any holidays coming up?"