arch-index SKILL.md skillA
arch-index from coco-research/coco is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add coco-research/coco/arch-index@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- coco-research/coco
- Path
skills/arch-index/SKILL.md- Versions recorded
- 2
- Latest version
- v1.0.0, committed Sep 18, 2026
- First version recorded
- Aug 2, 2026
- Size
- 11,221 bytes
- Repository stars
- 629
- License
- Apache-2.0
Build and validate .arch/index.json — a committed map from each architectural component of this repository to the real directories and files that implement it, pinned to a git commit, with every path verified to exist. Also detects structural drift between that index and the current code. Use when asked to map a codebase, produce a component or code-ownership index, find which files implement a component, check whether architecture docs are stale, or detect architecture drift after a refactor.…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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, …
Read the whole file at its exact version.
How to install
mdr add coco-research/coco/arch-index@sha256:a4cffa8596436a02The line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_tuvnlezo3vq5h45x)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Aug 2, 2026 and Sep 18, 2026, about one every 47 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-09-18 | 5330276 | 11,221 B | A | view · diff |
| v1.0.0 | 2026-08-02 | cdfdbc2 | 11,201 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11221 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
coco-research/coco · 629 stars · license Apache-2.0 · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_tuvnlezo3vq5h45x GET https://markdownregistry.com/api/v1/resolve?ref=coco-research/coco/arch-index GET https://markdownregistry.com/api/v1/blob/a4cffa8596436a0227c884af7762b50eac6ac4b63410802baa79667e7b0bc4bb
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.