Home / dayfinggg / openai-codex-agent-skills · GitHub

design SKILL.md skillA

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/design@git:20261105.39988c5

Pins git:20261105.39988c5 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/design/SKILL.md
Versions recorded: 3
Latest version: git:20261105.39988c5, committed Nov 5, 2026
First version recorded: Aug 27, 2026
Size: 2,822 bytes
Repository stars: 8
License: MIT

Designs module interfaces, dependency seams, and test boundaries when asked how to structure a module or make code testable. Does not perform a diff review or prescribe speculative abstractions.

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

1. Start from a concrete caller's task and the current dependency path. Identify what callers must know today, which knowledge is duplicated, and which change or test is obstructed. Treat the interface as signatures plus invariants, ordering, errors, ownership, configuration, and relevant performance obligations. Keep the repository's domain vocabulary.

2. Choose the smallest interface that owns the required behavior and hides decisions callers should not repeat. Judge depth by useful behavior behind the interface, not implementation length or method counts. Apply the deletion test. If removing a wrapper removes only forwarding, prefer the existing dependency. If it pushes policy back into callers, locate that policy in one owner.

3. Place a dependency seam where behavior must actually vary or an effect must be controlled in a real test. Keep implementation-only seams private. A production dependency and a justified test substitute can warrant injection without multiple production implementations. Prefer an existing function or constructor parameter over a new port hierarchy. Separate deterministic decisions from effects where that preserves the required semantics.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add dayfinggg/openai-codex-agent-skills/design@sha256:a80c75f520c0c5a2

The line at the top of this page pins the label git:20261105.39988c5, 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_aqdaa7tba74l5wj5.svg)](https://markdownregistry.com/a/art_aqdaa7tba74l5wj5)

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

Versions

The registry has recorded 3 versions of this file, between Aug 27, 2026 and Nov 5, 2026, about one every 35 days.

version	committed	commit	size	audit
git:20261105.39988c5 latest	2026-11-05	39988c5	2,822 B	A	view · diff
git:20260828.11fcd39	2026-08-28	11fcd39	7,763 B	A	view · diff
git:20260827.f961daa	2026-08-27	f961daa	9,124 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 (2822 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 2026-11-05 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_aqdaa7tba74l5wj5
GET https://markdownregistry.com/api/v1/resolve?ref=dayfinggg/openai-codex-agent-skills/design
GET https://markdownregistry.com/api/v1/blob/a80c75f520c0c5a296016cdc507f708bce7f11847a7ce599e1e2d3ea9ed0d880

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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