duo-lint SKILL.md skillA
duo-lint from kimeur/duology is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add kimeur/duology/duo-lint@git:20261018.dfcd3c5Pins git:20261018.dfcd3c5 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- kimeur/duology
- Path
plugins/duology-ship/skills/duo-lint/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261018.dfcd3c5, committed Oct 18, 2026
- Size
- 12,519 bytes
- Repository stars
- 13
- License
- MIT
The fold linter for iPhone Duo, Apple's foldable with an outer display and an inner display. Run it to find code Apple says to remove before an app runs on the foldable; it reports each finding with the fix for its rule. Catches UIScreen.main and UIScreen.screens, UIDevice.current.orientation, statusBarOrientation, the deprecated interfaceOrientation properties and effectiveGeometry.interfaceOrientation, userInterfaceIdiom == .pad, horizontalSizeClass == .regular treated as iPad, hard-coded…
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
# duo-lint duo-lint scans Swift (and optionally Objective-C) code, `Info.plist` files and build settings for patterns that break on iPhone Duo. Each finding names the rule, the code, a fix and the Apple page behind it. It is one Python 3 file with no dependencies. It runs locally and sends nothing anywhere. Most rules come from Step 2 of Apple's [Three steps to make your app shine on iPhone Duo](https://developer.apple.com/iphone-duo/prepare/). Xcode 27.1 also ships an App Resizability agent skill that looks for the same patterns ([prepare page](https://developer.apple.com/iphone-duo/prepare/)). duo-lint doesn't replace it. Use duo-lint where you need a repeatable check: CI, the lint hook, or another coding agent. duo-lint reads code. It can't see the screen. For a full iPhone Duo audit, run `/duo-audit` (in the `duology-ship` plugin): it runs duo-lint, then the 15-point `duo-design-review` checklist on screenshots from the Duo simulator, and ranks everything in one list. Without Claude Code, run duo-lint, then follow the `duo-design-review` skill. …
Read the whole file at its exact version.
How to install
mdr add kimeur/duology/duo-lint@sha256:a02eda70b672ef6eThe line at the top of this page pins the label git:20261018.dfcd3c5, 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_zisbsm5emvyvotxh)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 18, 2026.
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 (12519 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
kimeur/duology · 13 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zisbsm5emvyvotxh GET https://markdownregistry.com/api/v1/resolve?ref=kimeur/duology/duo-lint GET https://markdownregistry.com/api/v1/blob/a02eda70b672ef6e2bb12bf61bc03596d7d1d21c5307361ea3e61df1b4b2f2da
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.