Function/Tool Calling

Summary

Letting a model choose to call a predefined function (with structured arguments) instead of just generating text — the mechanism that turns an LLM from a chatbot into an agent that takes actions.

• 1Define a simple tool (e.g. a calculator or weather lookup) and wire it into an LLM API call.
• 2Learn how the model decides when to call a tool vs. respond directly.
• 3Practice handling tool-call errors and feeding results back into the conversation.