Upgrading dependencies is one of those chores everyone knows they have to do and almost nobody wants to. Read the changelog, figure out what breaks, check whether it affects your project, adjust the code, run the tests. Repeat for every package. This post tells how I turned that annoyance into a personal tool and, step by step, into an AI agent skill that now does the job end to end: breaking-changes-analyzer . The goal here is not to teach you how to use the skill (the README does that...