codebase-design SKILL.md skillA

This file is byte-identical to the first copy the registry indexed, one of 15 indexed copies. Same content hash, so the same checks give both the same grade.

codebase-design from kunolu/640-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add kunolu/640-skills/codebase-design@git:20260827.561ec6a

Pins git:20260827.561ec6a in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

kunolu/640-skills

Path

sbtd-workflow-onboard/assets/external-skills/stable/skills/codebase-design/SKILL.md

Versions recorded

2

Latest version

git:20260827.561ec6a, committed Aug 27, 2026

First version recorded

Jul 18, 2026

Size

6,446 bytes

Repository stars

557

License

Apache-2.0

Shared vocabulary for designing deep modules. Use when the user wants to design or improve a module's interface, find deepening opportunities, decide where a seam goes, make code more testable or AI-navigable, or when another skill needs the deep-module vocabulary.

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

# Codebase Design

Design **deep modules**: a lot of behaviour behind a small interface, placed at a clean seam, testable through that interface. Use this language and these principles wherever code is being designed or restructured. The aim is leverage for callers, locality for maintainers, and testability for everyone.

## Glossary

Use these terms exactly: don't substitute "component," "service," "API," or "boundary." Consistent language is the whole point.

**Module**: anything with an interface and an implementation. Deliberately scale-agnostic: a function, class, package, or tier-spanning slice. _Avoid_: unit, component, service.

**Interface**: everything a caller must know to use the module correctly: the type signature, but also invariants, ordering constraints, error modes, required configuration, and performance characteristics. _Avoid_: API, signature (too narrow, they refer only to the type-level surface).
…

Read the whole file at its exact version.

How to install

mdr add kunolu/640-skills/codebase-design@sha256:2c20617f87ec8af6

[![mdr](https://markdownregistry.com/badge/art_rezrrlcjdoonytmn.svg)](https://markdownregistry.com/a/art_rezrrlcjdoonytmn)

Versions

The registry has recorded 2 versions of this file, between Jul 18, 2026 and Aug 27, 2026, about one every 40 days.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_rezrrlcjdoonytmn
GET https://markdownregistry.com/api/v1/resolve?ref=kunolu/640-skills/codebase-design
GET https://markdownregistry.com/api/v1/blob/2c20617f87ec8af6a434859f381b2f061a69b530444e74eb39e78bb016a6d1e2

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.

More from kunolu/640-skills

Every file in kunolu/640-skills

Other files named codebase-design

Browse by kind, by grade A, or by owner.