The usual way to steer a coding agent is one big instructions file: how to ship to Apple, how to write tests, how to update a price list.

For me that held up until roughly the third app. The file grew past what the agent keeps in focus, rules started to contradict each other, and the agent offered me an Android deploy while I was editing a website.

The failure isn't that the agent forgets. It's that it was told everything at once, whether or not it applied.

This is part two of a series on running AI agents across several repos. It covers what replaced the giant file: App Factory , an open-source library of Claude Code skills that works as a production line. It takes a repo with an app's code and carries it all the way to a live app on the App Store and Google Play.

A skill is instructions plus the tool

In Claude Code, a skill is an instructions document that the agent loads only when its description matches what you asked for .…