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codebase-design SKILL.md skillA

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

Install it, pinned

mdr add dayfinggg/openai-codex-agent-skills/codebase-design@git:20261029.276ae81

Pins git:20261029.276ae81 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: dayfinggg/openai-codex-agent-skills
Path: codex/skills/codebase-design/SKILL.md
Versions recorded: 4
Latest version: git:20261029.276ae81, committed Oct 29, 2026
First version recorded: Jul 26, 2026
Size: 6,484 bytes
Repository stars: 8
License: MIT

Design or improve a module interface, dependency seam, or test boundary for the requested change without speculative abstraction.

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

Read [local host integration](../.shared/host-integration.md) before applying this imported workflow.

# 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 this vocabulary to reason consistently, while preserving the repository's established domain language. The terms below are design concepts rather than mandatory renaming rules.

**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 dayfinggg/openai-codex-agent-skills/codebase-design@sha256:016e72e0f3f83ccd

The line at the top of this page pins the label git:20261029.276ae81, 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_yr34hbmu7uhdphuw.svg)](https://markdownregistry.com/a/art_yr34hbmu7uhdphuw)

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

Versions

The registry has recorded 4 versions of this file, between Jul 26, 2026 and Oct 29, 2026, about one every 32 days.

version	committed	commit	size	audit
git:20261029.276ae81 latest	2026-10-29	276ae81	6,484 B	A	view · diff
git:20260801.8234b5f	2026-08-01	8234b5f	6,023 B	A	view · diff
git:20260727.971ea79	2026-07-27	971ea79	6,133 B	A	view · diff
git:20260726.812376b	2026-07-26	812376b	5,872 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 (6484 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

dayfinggg/openai-codex-agent-skills · 8 stars · license MIT · pushed 2026-11-01 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_yr34hbmu7uhdphuw
GET https://markdownregistry.com/api/v1/resolve?ref=dayfinggg/openai-codex-agent-skills/codebase-design
GET https://markdownregistry.com/api/v1/blob/016e72e0f3f83ccdbd2743704f9252b3fda62d73b61d495e3d7713838ad859f2

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.

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