<p>Claude's tool use (function calling) API is what separates toy chatbots from actual agents. I've built production agents with it — here's what reliable tool use looks like when
<blockquote> <p>Originally published at <a href="https://kalyna.pro/claude-api-function-calling/" rel="noopener noreferrer">kalyna.pro</a></p> </blockquote> <p>Function calling —
<p>When a user asks the LLM to perform an action, e.g., get the current weather or current stock market details, the LLM cannot get this information on its own. It needs some
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