arch-indexlisted

# 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. It is not a design tool. The index is **reverse-only** — it describes code that exists on disk at a known commit. There is no mode for specifying a system that has not been built, because the central check is that every path resolves. Forward design work belongs in `/team think`, the `SI-*-Design` councils, or `/util:create-architecture-documentation`. It is not a codebase-mapping tool either, and it should not act like one. When `.planning/codebase/` exists, `gsd-map-codebase` has already produced seven structured documents covering the stack, integrations, architecture, structure, conventions, testing, and concerns. This skill **reads those and skips crawling entirely.** Crawling a repository that has already been mapped is the exact waste this skill was designed to avoid, and duplicating `gsd-map-codebase` would make it a worse version of a tool that already exists. It is not a work-allocation mechan