Why Coding Agents Keep Making Your Codebase Worse

<p>HumanLayer CEO Dexter Horthy, who coined &quot;context engineering&quot;, on why AI agents degrade codebases over time. He breaks down a benchmark that measures AI code quality across features, and how his team ships with agents without drowning in slop.</p><p>In this video, we cover:</p><ul><li>SlopCodeBench, SWE-bench and which coding benchmarks to trust</li><li>Token maxing, dark factories and the &quot;Instagram phase&quot; of AI engineering</li><li>Why 2-4x productivity beats chasing 100x</li><li>Pull requests, design docs and how engineers build taste now</li><li>Dex&#39;s agentic engineering workflow: one-shots, overnight janitor bots and research-design-plan</li></ul><p>For engineers and engineering leaders adopting AI coding agents who want to know what&#39;s real and what works in teams at scale.</p><p>Timestamps:<br>00:00:00 - The Man Who Coined the Term: Context Engineering<br>00:00:54 - SlopCodeBench: Proof AI Makes Codebases Worse Over Time<br>00:05:49 - Background Agents and the Enterprise Friction Problem<br>00:08:13 - Why You&#39;ll Never One-Shot a Big Feature<br>00:11:18 - Scaling Agentic Engineering to 1,000 Engineers<br>00:16:19 - Dark Factories, Fake Hype and Token Maxing<br>00:19:55 - Why 2-4x Faster Beats Chasing 100x<br>00:21:31 - Should Teams Stop Doing Pull Requests?<br>00:24:20 - Can Deterministic Tools Replace Code Review?<br>00:27:37 - How to Build Engineering Taste When AI Writes Code<br>00:33:05 - Dex&#39;s Agentic Workflow: One-Shots and Janitor Bots<br>00:35:18 - Research, Design, Plan: Shipping Big Features With Agents<br>00:38:35 - Why Overnight Agents and Heavy Parallelism Backfire<br>00:40:10 - Subscription Maxing vs Paying Per Token<br>00:42:40 - Parallelize Like Poker, Not a Slot Machine</p><p>Dex Horthy: <a href="https://x.com/dexhorthy" target="_blank" rel="noopener noreferer nofollow">https://x.com/dexhorthy</a><br>Dex&#39;s talks and deep dives: <a href="https://aithatworks.bold.video" target="_blank" rel="noopener noreferer nofollow">https://aithatworks.bold.video</a></p><p><a href="#AgenticEngineering">#AgenticEngineering</a> <a href="#AICoding">#AICoding</a> <a href="#SoftwareEngineering">#SoftwareEngineering</a></p>