---
title: The anatomy of an agent
seo_title: The anatomy of an agent — video
description: 'How an AI agent works internally: context, planning, tools, memory, state, and runtime. A tool call is a contract, not magic.'
keywords: AI agent anatomy, tools, tool calling, agent memory, runtime state, MCP, ReAct
date: '2026-07-14T00:00:00+00:00'
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    <div class="s5-video-watch__crumbs"><a href="https://5sigmas.com/en/videos/">All videos</a><span>AI agents</span><span>0:32</span></div>
    <h1>The anatomy of an agent</h1><p>How an AI agent works internally: context, planning, tools, memory, state, and runtime. A tool call is a contract, not magic.</p>
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    <div class="s5-video-watch__section-head"><span class="s5-eyebrow">Video summary</span><h2 id="video-summary-title">The ideas to retain</h2></div>
    <div class="s5-video-watch__snippet-grid"><article><span>01</span><h2>The minimal loop</h2><p>The simplest pattern has four steps:</p></article>
<article><span>02</span><h2>Tool calling: from text to a contract</h2><p>A tool should not be presented to the model as a vague sentence such as “you can query the system.” It needs an explicit contract:</p></article>
<article><span>03</span><h2>Context, memory, and state are not the same thing</h2></article></div>
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  <aside class="s5-video-watch__source"><div><span class="s5-eyebrow">Context and evidence</span><h2>Continue with the full article</h2><p>The chapter develops the mechanism, primary sources, limitations and connections to the rest of the series.</p></div><a class="s5-video-watch__source-link" href="https://5sigmas.com/en/series/agentes-ia/02-anatomia-de-un-agente/">Read the article →</a></aside>
  <section class="s5-video-watch__related" aria-labelledby="related-videos-title"><div class="s5-video-watch__section-head"><span class="s5-eyebrow">Next step</span><h2 id="related-videos-title">Related videos</h2></div><div class="s5-video-watch__related-grid"><article><a href="https://5sigmas.com/en/videos/series/agentes-ia/05-de-la-demo-a-produccion/"><img src="https://5sigmas.com/en/series/agentes-ia/05-de-la-demo-a-produccion.jpg" alt="" loading="lazy" width="1280" height="720"><span>AI agents · 0:32</span><strong>From demo to production</strong></a></article>
<article><a href="https://5sigmas.com/en/videos/series/agentes-ia/04-seguridad-agentes/"><img src="https://5sigmas.com/en/series/agentes-ia/04-seguridad-agentes.jpg" alt="" loading="lazy" width="1280" height="720"><span>AI agents · 0:32</span><strong>Agent security</strong></a></article>
<article><a href="https://5sigmas.com/en/videos/series/agentes-ia/03-como-evaluar-un-agente/"><img src="https://5sigmas.com/en/series/agentes-ia/03-como-evaluar-un-agente.jpg" alt="" loading="lazy" width="1280" height="720"><span>AI agents · 0:32</span><strong>How to evaluate an AI agent</strong></a></article></div></section>
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