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The cognitive impact of coding agents

Simon Willison's Blog / 4/4/2026

💬 OpinionSignals & Early TrendsIdeas & Deep Analysis
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Key Points

  • The note highlights the “cognitive cost” of using coding agents by contrasting how much effort can be squeezed into a 48-second clip versus an extended 1 hour 40 minute conversation.
  • It uses a real-world example of repackaging long-form discussion into short-form vertical video to illustrate differences in information density and perceived effort.
  • The post is framed as a short commentary rather than a technical guide, pointing readers toward deeper context in linked materials about agentic engineering.
  • It is published as a personal weblog note and is tagged under AI, generative AI, and LLMs, indicating the topic’s connection to agentic/cognitive implications of AI coding workflows.
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3rd April 2026

A fun thing about recording a podcast with a professional like Lenny Rachitsky is that his team know how to slice the resulting video up into TikTok-sized short form vertical videos. Here's one he shared on Twitter today which ended up attracting over 1.1m views!

That was 48 seconds. Our full conversation lasted 1 hour 40 minutes.

Posted 3rd April 2026 at 11:57 pm

This is a note by Simon Willison, posted on 3rd April 2026.

ai 1947 generative-ai 1728 llms 1694 podcast-appearances 38 ai-ethics 286 coding-agents 189 cognitive-debt 10 agentic-engineering 38

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