https://blog.baifan.site/en/tags/agent-loop/Recent content in Agent Loop on ByF (BaiFan) · Daily Deep ThinkHugo -- gohugo.ioenblog@baifan.site (ByF (BaiFan))blog@baifan.site (ByF (BaiFan))CC BY-NC 4.0Thu, 07 May 2026 09:00:00 +0800https://blog.baifan.site/en/claude-code-think-act-observe-loop/Thu, 07 May 2026 09:00:00 +0800blog@baifan.site (ByF (BaiFan))https://blog.baifan.site/en/claude-code-think-act-observe-loop/<!-- more --> <p>If you dig through the Claude Code source, you will discover a counterintuitive fact:</p> <p><strong>The core of the entire program is a while loop.</strong></p> <p>Not a complex state machine, not an elaborate pipeline, not distributed coordination — just a plain <code>while</code> loop that does three things over and over: let the model think, let the model act, feed the results back.</p> <div class="highlight-wrapper"><div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span><span class="lnt">2 </span><span class="lnt">3 </span><span class="lnt">4 </span><span class="lnt">5 </span><span class="lnt">6 </span><span class="lnt">7 </span><span class="lnt">8 </span><span class="lnt">9 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-text" data-lang="text"><span class="line"><span class="cl">while (user hasn&#39;t quit) { </span></span><span class="line"><span class="cl"> thinking = callLLM(conversation history + tool definitions) </span></span><span class="line"><span class="cl"> if (thinking.wants to call a tool) { </span></span><span class="line"><span class="cl"> result = executeTool(thinking.toolCall) </span></span><span class="line"><span class="cl"> conversationHistory.push(result) </span></span><span class="line"><span class="cl"> } else { </span></span><span class="line"><span class="cl"> output(thinking.reply) </span></span><span class="line"><span class="cl"> } </span></span><span class="line"><span class="cl">}</span></span></code></pre></td></tr></table> </div> </div></div> <p>That&rsquo;s it? The entire secret of an AI coding assistant lives in this loop?</p>