arch-index

Produces one artifact: .arch/index.json, a commit-pinned map from each architectural component of a repository to the real directories and files that implement it. Every claimed path is verified to exist by a script with an exit code, not by a promise in a prompt.

Guiding principle — Paths or it does not exist. The protocol that consumers follow is team:architecture.md. This file is the producer.

What this skill is for, and what it is not for

It is for answering, mechanically: which files implement this component, and has that stopped being true.