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href="/modules/m1-foundations#lesson-15-tool-calling-deep-dive" data-v-0009425e><!--[--><p class="text" data-v-0009425e>1.6 Tool Calling</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m1-foundations#lesson-16-vibe-coding-vs-agentic-engineering" data-v-0009425e><!--[--><p class="text" data-v-0009425e>1.7 Vibe Coding vs Engineering</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m1-foundations#lesson-17-do-you-trust-your-agents" data-v-0009425e><!--[--><p class="text" data-v-0009425e>1.8 Do You Trust Your Agents?</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e 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Patterns</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/labs/l2-multi-tool" data-v-0009425e><!--[--><p class="text" data-v-0009425e>Labs 2.10-2.11</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-51288d80><section class="VPSidebarItem level-0 collapsible collapsed is-link" data-v-51288d80 data-v-0009425e><div class="item" tabindex="0" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m3-safety" data-v-0009425e><!--[--><h2 class="text" data-v-0009425e>Module 3: Safety & Security</h2><!--]--></a><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-0009425e><span class="vpi-chevron-right caret-icon" data-v-0009425e></span></div></div><div class="items" 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caret-icon" data-v-0009425e></span></div></div><div class="items" data-v-0009425e><!--[--><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m4-orchestration#lesson-41-why-one-agent-is-not-enough" data-v-0009425e><!--[--><p class="text" data-v-0009425e>4.1-4.4 Patterns</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m4-orchestration#lesson-43-depth-2-delegation" data-v-0009425e><!--[--><p class="text" data-v-0009425e>4.5-4.9 Teams & Comms</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m4-orchestration#lesson-410-the-ceo-board-system" data-v-0009425e><!--[--><p class="text" data-v-0009425e>4.10-4.11 Case Studies</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/labs/l4-agent-chain" data-v-0009425e><!--[--><p class="text" data-v-0009425e>Labs 4.12-4.13</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-51288d80><section class="VPSidebarItem level-0 collapsible collapsed is-link" data-v-51288d80 data-v-0009425e><div class="item" tabindex="0" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m5-production" data-v-0009425e><!--[--><h2 class="text" data-v-0009425e>Module 5: Production</h2><!--]--></a><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-0009425e><span class="vpi-chevron-right caret-icon" data-v-0009425e></span></div></div><div class="items" data-v-0009425e><!--[--><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m5-production#lesson-51-what-production-means-for-agents" data-v-0009425e><!--[--><p class="text" data-v-0009425e>5.1-5.4 CI/CD & Stack</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m5-production#lesson-53-shadow-deployments" data-v-0009425e><!--[--><p class="text" data-v-0009425e>5.5-5.8 Deploy & Monitor</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/labs/l5-observability" data-v-0009425e><!--[--><p class="text" data-v-0009425e>Labs 5.9-5.10</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-51288d80><section class="VPSidebarItem level-0 collapsible collapsed is-link" data-v-51288d80 data-v-0009425e><div class="item" tabindex="0" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m6-economics" data-v-0009425e><!--[--><h2 class="text" data-v-0009425e>Module 6: Economics</h2><!--]--></a><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-0009425e><span class="vpi-chevron-right caret-icon" data-v-0009425e></span></div></div><div class="items" data-v-0009425e><!--[--><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m6-economics#lesson-60-the-compute-advantage-equation" data-v-0009425e><!--[--><p class="text" data-v-0009425e>6.0-6.2 Pricing</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m6-economics#lesson-63-cost-per-session-math" data-v-0009425e><!--[--><p class="text" data-v-0009425e>6.3-6.5 Eval Metrics</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m6-economics#lesson-66-ab-testing-agents" data-v-0009425e><!--[--><p class="text" data-v-0009425e>6.6-6.7 Testing</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/labs/l6-eval-harness" data-v-0009425e><!--[--><p class="text" data-v-0009425e>Labs 6.8-6.9</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-51288d80><section class="VPSidebarItem level-0 collapsible collapsed is-link" data-v-51288d80 data-v-0009425e><div class="item" tabindex="0" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m7-advanced" data-v-0009425e><!--[--><h2 class="text" data-v-0009425e>Module 7: Advanced</h2><!--]--></a><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-0009425e><span class="vpi-chevron-right caret-icon" data-v-0009425e></span></div></div><div class="items" data-v-0009425e><!--[--><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m7-advanced#lesson-71-autoresearch" data-v-0009425e><!--[--><p class="text" data-v-0009425e>7.1-7.3 Autoresearch</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m7-advanced#lesson-73-meta-agents" data-v-0009425e><!--[--><p class="text" data-v-0009425e>7.4-7.6 Meta & Beyond</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/labs/l7-autoresearch" data-v-0009425e><!--[--><p class="text" data-v-0009425e>Labs 7.7-7.8</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-51288d80><section class="VPSidebarItem level-0 collapsible collapsed is-link" data-v-51288d80 data-v-0009425e><div class="item" tabindex="0" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m8-capstone" data-v-0009425e><!--[--><h2 class="text" data-v-0009425e>Module 8: Capstone</h2><!--]--></a><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-0009425e><span class="vpi-chevron-right caret-icon" data-v-0009425e></span></div></div><div class="items" data-v-0009425e><!--[--><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m8-capstone#project-options" data-v-0009425e><!--[--><p class="text" data-v-0009425e>Project Options</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m8-capstone#capstone-phases" data-v-0009425e><!--[--><p class="text" data-v-0009425e>Phases</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-0009425e data-v-0009425e><div class="item" data-v-0009425e><div class="indicator" data-v-0009425e></div><a class="VPLink link link" href="/modules/m8-capstone#grading-rubric" data-v-0009425e><!--[--><p class="text" data-v-0009425e>Rubric</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-d8b57b2d data-v-9a6c75ad><div class="VPDoc has-sidebar has-aside" data-v-9a6c75ad data-v-e6f2a212><!--[--><!--]--><div class="container" data-v-e6f2a212><div class="aside" data-v-e6f2a212><div class="aside-curtain" data-v-e6f2a212></div><div class="aside-container" data-v-e6f2a212><div class="aside-content" data-v-e6f2a212><div class="VPDocAside" data-v-e6f2a212 data-v-cb998dce><!--[--><!--]--><!--[--><!--]--><nav aria-labelledby="doc-outline-aria-label" class="VPDocAsideOutline" data-v-cb998dce data-v-f610f197><div class="content" data-v-f610f197><div class="outline-marker" data-v-f610f197></div><div aria-level="2" class="outline-title" id="doc-outline-aria-label" role="heading" data-v-f610f197>On this page</div><ul class="VPDocOutlineItem root" data-v-f610f197 data-v-53c99d69><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-cb998dce></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-e6f2a212><div class="content-container" data-v-e6f2a212><!--[--><!--]--><main class="main" data-v-e6f2a212><div style="position:relative;" class="vp-doc _modules_m1-foundations" data-v-e6f2a212><div><h1 id="module-1-foundations" tabindex="-1">Module 1: Foundations <a class="header-anchor" href="#module-1-foundations" aria-label="Permalink to "Module 1: Foundations""></a></h1><h2 id="lesson-1-1-what-makes-an-agent" tabindex="-1">Lesson 1.1: What Makes an Agent? <a class="header-anchor" href="#lesson-1-1-what-makes-an-agent" aria-label="Permalink to "Lesson 1.1: What Makes an Agent?""></a></h2><p><strong>Definition</strong>: An AI agent = LLM + Tools + Loop. Without any one of these three, it's not an agent.</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>Agent = LLM (reasoning engine)</span></span>
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<span class="line"><span> + Tools (capability surface)</span></span>
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<span class="line"><span> + Loop (autonomous decision cycle)</span></span></code></pre></div><ul><li>A single LLM call with no tools = chatbot</li><li>An LLM with tools but no loop = augmented inference</li><li>Tools + loop + LLM = agent (it can decide what to do next)</li></ul><h3 id="the-three-components" tabindex="-1">The Three Components <a class="header-anchor" href="#the-three-components" aria-label="Permalink to "The Three Components""></a></h3><ol><li><p><strong>LLM</strong> — The reasoning engine. Given context + available tools, it decides which tool to call and with what parameters. The LLM is NOT the agent — it's the brain of the agent.</p></li><li><p><strong>Tools</strong> — The capability surface. Functions the agent can call: read files, run commands, search the web, query databases, call APIs. Each tool has a name, description, and input schema.</p></li><li><p><strong>Loop</strong> — The autonomous decision cycle. Think (LLM decides) → Act (tool executes) → Observe (result comes back) → Repeat. The loop is what makes it autonomous.</p></li></ol><hr><h2 id="lesson-1-2-the-harness-vs-the-model" tabindex="-1">Lesson 1.2: The Harness vs The Model <a class="header-anchor" href="#lesson-1-2-the-harness-vs-the-model" aria-label="Permalink to "Lesson 1.2: The Harness vs The Model""></a></h2><p><strong>Core insight</strong>: The agent harness IS the product, not the model.</p><p>Most engineers focus on model quality ("which model is best?"). The data tells a different story:</p><table tabindex="0"><thead><tr><th>Aspect</th><th>Model Matters</th><th>Harness Matters</th></tr></thead><tbody><tr><td>Tool selection accuracy</td><td>✓</td><td>✓ (prompt design)</td></tr><tr><td>Loop termination</td><td>✗</td><td>✓ (iteration limits)</td></tr><tr><td>Security</td><td>✗</td><td>✓ (hooks, sandboxing)</td></tr><tr><td>Cost</td><td>✓ (per-token price)</td><td>✓ (how many calls made)</td></tr><tr><td>Reliability</td><td>✗</td><td>✓ (retry, fallback, verify)</td></tr><tr><td>Context management</td><td>✗</td><td>✓ (window, summarization)</td></tr></tbody></table><p><strong>The multiplier effect</strong>: A good harness with a mediocre model outperforms a bad harness with the best model. The harness determines how many tokens you spend, how safely you operate, and how reliably you recover from failure.</p><h3 id="the-5-subsystems-of-a-harness" tabindex="-1">The 5 Subsystems of a Harness <a class="header-anchor" href="#the-5-subsystems-of-a-harness" aria-label="Permalink to "The 5 Subsystems of a Harness""></a></h3><p>A harness is not a single thing. It's five subsystems working together:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>HARNESS</span></span>
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<span class="line"><span>├── Instructions — System prompts, AGENTS.md, CLAUDE.md, skills</span></span>
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<span class="line"><span>├── Tools — Bash, file ops, MCP servers, APIs, custom tools</span></span>
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<span class="line"><span>├── Environment — File system, runtime, git worktree, sandbox</span></span>
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<span class="line"><span>├── State — Session history, context window, mental models</span></span>
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<span class="line"><span>└── Verification — Tests, evals, verifier agents, review gates</span></span></code></pre></div><p>Every agent failure maps to one of these five. When something breaks, don't swap the model — check each subsystem in order.</p><h3 id="the-4-dimensions-of-control" tabindex="-1">The 4 Dimensions of Control <a class="header-anchor" href="#the-4-dimensions-of-control" aria-label="Permalink to "The 4 Dimensions of Control""></a></h3><p>Your control over an agent boils down to four dimensions:</p><table tabindex="0"><thead><tr><th>Dimension</th><th>What You Control</th><th>Leverage</th></tr></thead><tbody><tr><td><strong>Context</strong></td><td>What the agent knows (files, instructions, history)</td><td>High</td></tr><tr><td><strong>Model</strong></td><td>Which LLM powers the agent</td><td>Low (same for everyone)</td></tr><tr><td><strong>Prompt</strong></td><td>How you instruct the agent (system prompt, tools, skills)</td><td>Very high</td></tr><tr><td><strong>Tools</strong></td><td>What the agent can do (capability surface)</td><td>Highest</td></tr></tbody></table><p>Great harness engineering = managing these four dimensions across many agents at scale.</p><h2 id="lesson-1-8-do-you-trust-your-agents" tabindex="-1">Lesson 1.8: Do You Trust Your Agents? <a class="header-anchor" href="#lesson-1-8-do-you-trust-your-agents" aria-label="Permalink to "Lesson 1.8: Do You Trust Your Agents?""></a></h2><p><strong>This is the central question of agentic engineering.</strong> Every architectural decision — security, verification, monitoring, autonomy — comes back to trust. The more trust you build into your systems, the more you can delegate. The more you delegate, the more leverage you have.</p><h3 id="the-counterargument-george-hotz" tabindex="-1">The Counterargument: George Hotz <a class="header-anchor" href="#the-counterargument-george-hotz" aria-label="Permalink to "The Counterargument: George Hotz""></a></h3><p>Not everyone agrees. George Hotz (founder of comma.ai, first iPhone jailbreaker) argues that AI agents cannot program and their adoption will be one of the most costly mistakes in the field's history.</p><p>His core critique:</p><ul><li>Agents produce <strong>statistically plausible</strong> output that is <strong>broken in increasingly hard-to-detect ways</strong></li><li>The "slot machine" problem: agents frontload progress quickly, then require endless tweaking to finish</li><li>Large organizations with slow feedback loops will suffer most — bottom performers produce 10x slop</li></ul><blockquote><p>"Golden era for buckets of slop, dark age for gems of quality." — George Hotz</p></blockquote><h3 id="why-we-include-this" tabindex="-1">Why We Include This <a class="header-anchor" href="#why-we-include-this" aria-label="Permalink to "Why We Include This""></a></h3><p>If you only hear the optimistic view, you'll deploy agents naively and get burned. Hotz's critique identifies real failure modes. This course addresses each one:</p><table tabindex="0"><thead><tr><th>Hotz's Critique</th><th>Our Solution</th><th>Module</th></tr></thead><tbody><tr><td>Slop amplification</td><td>CI/CD quality gates + golden datasets</td><td>M5</td></tr><tr><td>Hard-to-detect breakage</td><td>Verifier pattern (read-only checks)</td><td>M3</td></tr><tr><td>Slot machine polish problem</td><td>Defense-in-depth + confidence ladder</td><td>M3</td></tr><tr><td>No world models</td><td>Evaluation frameworks + pass@k</td><td>M6</td></tr></tbody></table><p><strong>The honest take</strong>: Agents produce slop. The harness, verification, and production patterns are what turn slop into shipped quality. Without the harness, Hotz is right.</p><h3 id="meanwhile-armin-ronacher" tabindex="-1">Meanwhile: Armin Ronacher <a class="header-anchor" href="#meanwhile-armin-ronacher" aria-label="Permalink to "Meanwhile: Armin Ronacher""></a></h3><p>Armin (creator of Flask, Pi maintainer) reveals that <strong>Pi is built with Pi</strong> — agents building the tools that build agents. This is the meta-agent pattern in production. But he's honest about limitations:</p><blockquote><p>"We're quite far off today from where Bun and [others] are. Today it does not seem like we know how to pull off a dark factory."</p></blockquote><p>The honest middle ground between full automation and pure skepticism.</p><h3 id="the-question-remains" tabindex="-1">The Question Remains <a class="header-anchor" href="#the-question-remains" aria-label="Permalink to "The Question Remains""></a></h3><p>Do you trust your agents? The answer should be: <strong>yes, because you've engineered the trust.</strong> Security (M3), verification (M3), production patterns (M5), and evaluation (M6) are how you earn that trust.</p><p>This is the central question of agentic engineering. Every architectural decision — security, verification, monitoring, autonomy — comes back to trust. The more trust you build into your systems, the more you can delegate. The more you delegate, the more leverage you have.</p><hr><h2 id="lesson-1-3-decision-framework-—-should-i-use-an-agent-for-this" tabindex="-1">Lesson 1.3: Decision Framework — "Should I use an agent for this?" <a class="header-anchor" href="#lesson-1-3-decision-framework-—-should-i-use-an-agent-for-this" aria-label="Permalink to "Lesson 1.3: Decision Framework — "Should I use an agent for this?"""></a></h2><h3 id="the-4-question-filter" tabindex="-1">The 4-Question Filter <a class="header-anchor" href="#the-4-question-filter" aria-label="Permalink to "The 4-Question Filter""></a></h3><ol><li><p><strong>Uncertainty level</strong>: Can you write deterministic code for this?</p><ul><li>Yes → Write code, not an agent</li><li>No → Consider agent</li><li>Partially → Agent with deterministic guardrails</li></ul></li><li><p><strong>Failure cost</strong>: What happens if the agent messes up?</p><ul><li>Low (chatbot, content gen) → Full autonomy</li><li>Medium (code gen, data processing) → Verification layer</li><li>High (financial, medical, infrastructure) → Human-in-the-loop</li></ul></li><li><p><strong>Loop depth</strong>: How many decisions must the agent make?</p><ul><li>1-2 steps → Single LLM call with tools</li><li>3-10 steps → Simple agent loop</li><li>10+ steps → Multi-agent with orchestration</li></ul></li><li><p><strong>Observability requirement</strong>: Can you tolerate a black box?</p><ul><li>Yes → Full autonomy</li><li>No → Tool-augmented only (no freeform agent loop)</li></ul></li></ol><h3 id="the-decision-tree" tabindex="-1">The Decision Tree <a class="header-anchor" href="#the-decision-tree" aria-label="Permalink to "The Decision Tree""></a></h3><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>Can you solve it deterministically?</span></span>
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<span class="line"><span>├── YES → Write code. Don't use an agent.</span></span>
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<span class="line"><span>└── NO → </span></span>
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<span class="line"><span> Is failure cost HIGH?</span></span>
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<span class="line"><span> ├── YES → Agent + human-in-the-loop + verification</span></span>
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<span class="line"><span> └── NO →</span></span>
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<span class="line"><span> Is loop depth > 10?</span></span>
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<span class="line"><span> ├── YES → Multi-agent system with orchestration</span></span>
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<span class="line"><span> └── NO → Simple agent loop with tool use</span></span></code></pre></div><hr><h2 id="lesson-1-8-the-repository-is-the-spec" tabindex="-1">Lesson 1.8: The Repository IS the Spec <a class="header-anchor" href="#lesson-1-8-the-repository-is-the-spec" aria-label="Permalink to "Lesson 1.8: The Repository IS the Spec""></a></h2><p><strong>Core principle</strong>: All necessary context for your agent should live in the repository. The repo is the single source of truth — not a README, not a wiki, not tribal knowledge.</p><h3 id="what-the-repo-should-contain" tabindex="-1">What the Repo Should Contain <a class="header-anchor" href="#what-the-repo-should-contain" aria-label="Permalink to "What the Repo Should Contain""></a></h3><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>repo/</span></span>
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<span class="line"><span>├── AGENTS.md or CLAUDE.md — Agent instructions (THE file)</span></span>
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<span class="line"><span>├── .cursorrules — Tool-specific rules</span></span>
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<span class="line"><span>├── skills/ — Reusable skill definitions</span></span>
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<span class="line"><span>│ ├── skill-name/</span></span>
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<span class="line"><span>│ │ ├── SKILL.md — What the skill does</span></span>
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<span class="line"><span>│ │ └── scripts/ — Supporting scripts</span></span>
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<span class="line"><span>├── .mcp.json — MCP server configuration</span></span>
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<span class="line"><span>├── .claude/hooks/ — Lifecycle hooks</span></span>
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<span class="line"><span>├── init.sh — Environment setup script</span></span>
|
||
<span class="line"><span>├── feature_list.json — Tracked feature inventory</span></span>
|
||
<span class="line"><span>└── tests/ — Verification evidence</span></span></code></pre></div><h3 id="why-this-matters" tabindex="-1">Why This Matters <a class="header-anchor" href="#why-this-matters" aria-label="Permalink to "Why This Matters""></a></h3><p>An agent can only see what you put in front of it. A well-structured repo:</p><ul><li>Eliminates tribal knowledge (the agent discovers it from files)</li><li>Makes onboarding instant (new agent reads the same files)</li><li>Creates audit trails (every instruction is version-controlled)</li><li>Enables multi-agent teams (all agents read from the same source of truth)</li></ul><p><strong>Rule</strong>: If an agent needs to know something to do its job, that information must be in a file in the repo.</p><hr><h2 id="lesson-1-8-the-agent-loop" tabindex="-1">Lesson 1.8: The Agent Loop <a class="header-anchor" href="#lesson-1-8-the-agent-loop" aria-label="Permalink to "Lesson 1.8: The Agent Loop""></a></h2><h3 id="the-universal-pattern" tabindex="-1">The Universal Pattern <a class="header-anchor" href="#the-universal-pattern" aria-label="Permalink to "The Universal Pattern""></a></h3><p>Every agent, regardless of complexity, follows this loop:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>while not done and iterations < MAX_ITERATIONS:</span></span>
|
||
<span class="line"><span> 1. THINK: LLM receives context + tool list → decides what to do</span></span>
|
||
<span class="line"><span> 2. ACT: Tool executes (read file, run command, query DB, etc.)</span></span>
|
||
<span class="line"><span> 3. OBSERVE: Result comes back as a message</span></span>
|
||
<span class="line"><span> 4. REPEAT or DONE: LLM decides whether to continue or finish</span></span></code></pre></div><h3 id="pseudocode" tabindex="-1">Pseudocode <a class="header-anchor" href="#pseudocode" aria-label="Permalink to "Pseudocode""></a></h3><div class="language-python vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">python</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">messages </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> [system_prompt, user_request]</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">while</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> True</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">:</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> response </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> llm.invoke(messages, </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">tools</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">tool_definitions)</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> response.is_final_answer:</span></span>
|
||
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> print</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(response.content)</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> break</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> tool_name </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> response.tool_call.name</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> tool_args </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> response.tool_call.args</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> result </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> execute_tool(tool_name, tool_args)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> messages.append({</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"role"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"assistant"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"content"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: response.content})</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> messages.append({</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"role"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"tool"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"content"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">str</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(result)})</span></span></code></pre></div><hr><h2 id="lesson-1-8-tool-calling-deep-dive" tabindex="-1">Lesson 1.8: Tool Calling Deep Dive <a class="header-anchor" href="#lesson-1-8-tool-calling-deep-dive" aria-label="Permalink to "Lesson 1.8: Tool Calling Deep Dive""></a></h2><h3 id="tool-definition-anatomy" tabindex="-1">Tool Definition Anatomy <a class="header-anchor" href="#tool-definition-anatomy" aria-label="Permalink to "Tool Definition Anatomy""></a></h3><p>Every tool needs four things:</p><div class="language-python vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">python</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">tools </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> [{</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "name"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"search_web"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "description"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Search the web for current information"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "input_schema"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: {</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "type"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"object"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "properties"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: {</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "query"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: {</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"type"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"string"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"description"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"The search query"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">},</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "max_results"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: {</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"type"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"integer"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"default"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">5</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> },</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "required"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: [</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"query"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">]</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}]</span></span></code></pre></div><h3 id="the-reasoning-parameter" tabindex="-1">The Reasoning Parameter <a class="header-anchor" href="#the-reasoning-parameter" aria-label="Permalink to "The Reasoning Parameter""></a></h3><p>Every tool call should include a <code>reasoning</code> field. This forces the LLM to explain WHY before it acts:</p><div class="language-python vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">python</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">def</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> search_web</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(query: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">str</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, reasoning: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">str</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, max_results: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">int</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 5</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">):</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> """Search the web. The 'reasoning' param explains why this call is needed."""</span></span>
|
||
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> ...</span></span></code></pre></div><p>This single pattern:</p><ul><li>Reduces hallucinated tool calls by ~40%</li><li>Makes agent decisions debuggable</li><li>Gives the LLM a "thinking slot" before acting</li><li>Creates an audit trail for every action</li></ul><h3 id="forced-tool-calls-vs-auto" tabindex="-1">Forced Tool Calls vs Auto <a class="header-anchor" href="#forced-tool-calls-vs-auto" aria-label="Permalink to "Forced Tool Calls vs Auto""></a></h3><table tabindex="0"><thead><tr><th>Mode</th><th>Behavior</th><th>Use When</th></tr></thead><tbody><tr><td><code>auto</code></td><td>LLM decides to call tool or respond</td><td>Simple tasks, human handoff</td></tr><tr><td><code>any</code> / <code>required</code></td><td>LLM MUST call a tool</td><td>Agent loops where each turn = action</td></tr><tr><td>Specific tool</td><td>LLM must use exact tool</td><td>Debugging, testing, routing</td></tr></tbody></table><hr><h2 id="lesson-1-8-vibe-coding-vs-agentic-engineering" tabindex="-1">Lesson 1.8: Vibe Coding vs Agentic Engineering <a class="header-anchor" href="#lesson-1-8-vibe-coding-vs-agentic-engineering" aria-label="Permalink to "Lesson 1.8: Vibe Coding vs Agentic Engineering""></a></h2><h3 id="the-five-hard-rules" tabindex="-1">The Five Hard Rules <a class="header-anchor" href="#the-five-hard-rules" aria-label="Permalink to "The Five Hard Rules""></a></h3><ol><li><p><strong>Risk compounds with runtime</strong> — A 1% per-turn failure rate = 63% chance of disaster over 100 turns. Long-running agents aren't safer, they're more exposed.</p></li><li><p><strong>If your agent can write AND execute code, you're back at L1 security</strong> — The marquee break: agent writes <code>cleanup.py</code>, runs <code>python cleanup.py</code>, your production data is gone.</p></li><li><p><strong>Every turn is a roll of the dice</strong> — Modern models refuse well 99% of the time. That last 1% grows with every feature release. Engineer the harness for the 1%, not the 99%.</p></li><li><p><strong>Token costs scale with loop depth, not task complexity</strong> — A simple task with a bad loop costs 10x more than a complex task with a clean loop. Optimize the loop first.</p></li><li><p><strong>What you can't measure, you can't improve</strong> — Every agent system needs: cost per task, success rate, loop efficiency, failure mode tracking.</p></li></ol><hr><h2 id="lab-1-9-your-first-agent" tabindex="-1">Lab 1.9: Your First Agent <a class="header-anchor" href="#lab-1-9-your-first-agent" aria-label="Permalink to "Lab 1.9: Your First Agent""></a></h2><p><strong>Objective</strong>: Build a single-tool agent from scratch in under 50 lines.</p><p><strong>Starter code</strong>: <code>course/labs/L1-first-agent/starter.py</code></p><div class="language-python vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">python</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">TODO</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">: Fill in the agent loop</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># 1. Define a tool (search_web or file_read)</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># 2. Define the tool schema</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># 3. Implement the agent loop</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># 4. Handle tool results</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># 5. Print the final answer</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> json</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># Your code here...</span></span></code></pre></div><p><strong>Checkpoints</strong>:</p><ol><li>Tool call is made correctly (schema matches)</li><li>Tool result is fed back to the LLM</li><li>LLM produces final answer using tool result</li><li>Loop terminates (doesn't run forever)</li></ol><p><strong>Solution</strong>: <code>course/labs/L1-first-agent/solution.py</code></p><hr><h2 id="quiz-m1" tabindex="-1">Quiz M1 <a class="header-anchor" href="#quiz-m1" aria-label="Permalink to "Quiz M1""></a></h2><ol><li>What three components make an AI agent? (Multiple choice)</li><li>True/False: The model quality matters more than the harness design</li><li>When should you NOT use an agent? (Scenario-based)</li><li>What does the <code>reasoning</code> parameter do?</li><li>Calculate: If an agent has a 2% failure rate per turn and runs 50 turns, what's the probability of at least one failure?</li></ol></div></div></main><footer class="VPDocFooter" data-v-e6f2a212 data-v-1bcd8184><!--[--><!--]--><div class="edit-info" data-v-1bcd8184><!----><div class="last-updated" data-v-1bcd8184><p class="VPLastUpdated" data-v-1bcd8184 data-v-1bb0c8a8>Last updated: <time datetime="2026-06-03T12:04:06.000Z" data-v-1bb0c8a8></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-1bcd8184><span class="visually-hidden" id="doc-footer-aria-label" data-v-1bcd8184>Pager</span><div class="pager" data-v-1bcd8184><!----></div><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link next" href="/labs/l1-first-agent" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Next page</span><span class="title" data-v-1bcd8184>Lab 1.9: First Agent</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-d8b57b2d data-v-566314d4><div class="container" data-v-566314d4><p class="message" data-v-566314d4>FDSA Agency — Agentic Engineering Course. Part of the fdsa.ai orchestration platform.</p><p class="copyright" data-v-566314d4>Copyright 2026</p></div></footer><!--[--><!--]--></div></div></div>
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