Skills for AI Agents

Chapter 1. The Closed Gap

A Note for Early Release Readers

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The gap between knowing how to do something and getting it done has been the central bottleneck of human productivity for centuries, and it just closed (sort of).¹ Let me explain.

When I started teaching at O’Reilly, updating one of my live courses looked like this: a producer would email me asking for refreshed materials. I’d pull up my notes from the last run of the course. I’d open the post-course feedback sheet — students flagging what worked, what didn’t, what to fix. I’d turn all of that into a task list: update these notebooks, re-render those slides, swap out this asset, rewrite that exercise. Then I’d spend the next week actually doing it — editing files, testing code, re-rendering slides, testing again. Four or five hours a day, five days in a row. Call it twenty-five hours of work.

Today, the same job takes between twenty and forty minutes.

The email still arrives. I still open the notes and the feedback sheet. But now I point Claude Code (AI agent tool ...