Claude API Function Calling: Complete Guide to Tool Use (2026)

<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

<p>When building an application with the Claude API, connecting tools is the first step toward a functional agent. The model can call functions, query databases, send messages.

<p>For a long time my AI coding workflow was a junk drawer. Aider, Continue, OpenClaw, three different VS Code plugins, an <code>.envrc</code> with API keys for providers I'd

<table> <tr><td> <a href="https://www.reddit.com/r/LocalLLaMA/comments/1wxfdt9/qwen38_27b_1_x_r9700_262k_context_half_a_million/"> <img alt="Qwen3.8 27B | 1 x R9700: 262K context,

<p>The <strong>Anthropic Python SDK</strong> makes it simple to integrate Claude into your applications. In this guide you'll go from zero to a working chatbot in under 10 minutes

<h2> Below are the steps executed for creation of Virtual environment </h2> <div class="highlight js-code-highlight"> <pre class="highlight shell"><code>python <span