Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add FloWritesCode/fwc-swiftui-skills --skill swiftui-iphone-duogit clone --depth 1 https://github.com/FloWritesCode/fwc-swiftui-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/flowritescode/fwc-swiftui-skills/swiftui-iphone-duo)<a href="https://agentmods.dev/skills/flowritescode/fwc-swiftui-skills/swiftui-iphone-duo"><img src="https://agentmods.dev/badge/skills/flowritescode/fwc-swiftui-skills/swiftui-iphone-duo/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/flowritescode/fwc-swiftui-skills/swiftui-iphone-duo"><img src="https://agentmods.dev/badge/skills/flowritescode/fwc-swiftui-skills/swiftui-iphone-duo.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00127 | $0.03451 |
| Opus 5.5 | $0.00051 | $0.01380 |
| Sonnet 5.5 | $0.00025 | $0.00690 |
| Haiku 4.5 | $0.00013 | $0.00345 |
Grade A, and why
swiftui-iphone-duo scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 23d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 298 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SwiftUI iPhone Duo
Do not design a separate “Duo version” of the app.
Start with an adaptive SwiftUI interface that works across continuously changing widths and heights. Add Duo-specific behavior only when the fold, hinge, second display, or vertical system bars materially improve the experience.
The target is not “Make this app support iPhone Duo.” The target is:
Make this app excellent at every size, then use Duo's unique hardware where it creates additional value.
Before reviewing or changing layout, read the full rulebook: reference.md.
When to use
- User asks to support iPhone Duo, a foldable iPhone, hinge, fold, or two displays.
- User asks for adaptive SwiftUI layout across compact → wide, including multitasking.
- Code uses
UIDevice,UIScreen.main(bounds or scale), idiom, orientation,isDuo, orisFoldedfor layout. - Work involves vertical bars, toolbar item ordering/overflow, sheet placement,
ArrangementView, reserved regions,onHingeChange/UIHingeInteraction, orCameraCaptureAccessory. - The project moves to the iOS 27.1 SDK (that build is what turns on full-screen layout and vertical bars).
Related skills
| Skill | When to load |
|---|---|
| swiftui-liquid-glass (this repo) | System bars and glass chrome on iOS 26+ |
| App Resizability (Apple, Xcode 27.1) | First-pass scan for resizing and Duo issues. Export for other agents with xcrun agent skills export |
Optimization order
- Adaptive layout
- Adaptive navigation
- Adaptive toolbars and tabs
- Fold-safe positioning
- Duo-specific arrangements
- Hinge-driven interactions
- Second-display experiences
Progressive API tiers
Classify every change before writing code. Always complete Tier 1 before proposing Tier 2 or Tier 3.
Tier 1 — Universal adaptive improvements (do these first):
NavigationSplitView
adaptive TabView
adaptive grids
ViewThatFits
AnyLayout
size classes
container-relative sizing
system toolbars
safe-area correctness
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 23d ago Changed · +29 lines · +42 tokens per session f0eafc60de6d
- 1mo ago First seen · 269 lines · 85 tokens per session scan A 689224e5779f
swiftui-iphone-duo is a skill published in the GitHub repository FloWritesCode/fwc-swiftui-skills (449 stars, last pushed 23d ago), licensed MIT. It adds 127 tokens to every session and 3,451 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-11.
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