Most agent setups start with a pile of useful local skills.
That pile usually makes sense to the person who built it. There is a skill for GitHub, one for writing, one for reminders, one for privacy filtering, one for making diagrams, one for checking session logs, one for working with canvases, one for creating new skills, and so on.
The problem shows up later, when a future agent has to decide what to do.
A local skill library answers the question, “What can this environment do?”
An AGENTS.md file should answer a different question:
