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codebase-design SKILL.md skillA

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

Install it, pinned

mdr add transitive-bullshit/skills/codebase-design@git:20261011.ef64499

Pins git:20261011.ef64499 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: transitive-bullshit/skills
Path: skills/codebase-design/SKILL.md
Versions recorded: 2
Latest version: git:20261011.ef64499, committed Oct 11, 2026
First version recorded: Oct 2, 2026
Size: 6,452 bytes
Repository stars: 4
License: MIT

Design or improve module boundaries and public interfaces. Use for architecture, testability, or shared deep-module concepts.

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 concepts to clarify the design while preserving the project’s established glossary. Translate module/interface terminology to component, service, API, or boundary when that is clearer in context.

**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

The exact contents, by fingerprint

mdr add transitive-bullshit/skills/codebase-design@sha256:6feff4d41f186855

The line at the top of this page pins the label git:20261011.ef64499, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_baqg7yqbhppvmbbc.svg)](https://markdownregistry.com/a/art_baqg7yqbhppvmbbc)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, between Oct 2, 2026 and Oct 11, 2026, about one every 9 days.

version	committed	commit	size	audit
git:20261011.ef64499 latest	2026-10-11	ef64499	6,452 B	A	view · diff
git:20261002.164a2bc	2026-10-02	164a2bc	6,427 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (6452 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

GitHub

transitive-bullshit/skills · 4 stars · license MIT · pushed 2026-10-21 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_baqg7yqbhppvmbbc
GET https://markdownregistry.com/api/v1/resolve?ref=transitive-bullshit/skills/codebase-design
GET https://markdownregistry.com/api/v1/blob/6feff4d41f186855dfeb9179f1f2d531644445b5ce1a486aaeb7cd4b9ebb151a

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 transitive-bullshit/skills

AGENTS.md AGENTS.md file

transitive-bullshit/skills · AGENTS.md

git:20261012.cfd478c · audit A · 4 stars

resolving-merge-conflicts SKILL.md skill

transitive-bullshit/skills · provenance/history/2026-10-11-removed/resolving-merge-conflicts/SKILL.md · Use when you need to resolve an in-progress git merge/rebase conflict.