Function Calling Explained: How an LLM Actually "Uses" a Tool

Posted on Sun 04 April 2027 in Beginner Guide • Tagged with GenAI, LLM, function-calling, tool-use, AI-agents, Python

The Misconception I Had

When I first heard that an LLM can "call a function" or "use a tool," I pictured the model reaching out and running code: checking the weather, querying a database, sending an email. It sounded almost magical, and a little scary.

The reality is much simpler …


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