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 Xopoko/build-swift-apps --skill app-icon-studiogit clone --depth 1 https://github.com/Xopoko/build-swift-appsWrote 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/xopoko/build-swift-apps/app-icon-studio)<a href="https://agentmods.dev/skills/xopoko/build-swift-apps/app-icon-studio"><img src="https://agentmods.dev/badge/skills/xopoko/build-swift-apps/app-icon-studio/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/xopoko/build-swift-apps/app-icon-studio"><img src="https://agentmods.dev/badge/skills/xopoko/build-swift-apps/app-icon-studio.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 29 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 44 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00040 | $0.01030 |
| Opus 5 | $0.00020 | $0.00515 |
| Sonnet 5 | $0.00008 | $0.00206 |
| Haiku 4.5 | $0.00004 | $0.00103 |
Grade A, and why
app-icon-studio 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 10d 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 — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.
App Icon Studio
Create Apple-platform app icons from product context, generate polished candidates, test small-size recognition, and install valid iOS or macOS icon assets.
Workflow
- Inspect product reality: README, app name, screenshots, onboarding, paywall, core screens, audience, competitors if useful, and the target platform.
- Write the strategy:
This icon should make <target user> remember <app name> as the app for <core job/emotion>, using <simple visual metaphor>. - Generate 3-5 distinct directions with
$imagegenunless the repo has a native vector/logo system that should be edited directly. - Evaluate at practical sizes: about
60px for iOS home-screen recognition, and64,32, and16px for macOS Dock/Finder stress checks. - Refine one square
1024x1024PNG master. Prefer no alpha for shared iOS/macOS assets and App Store readiness. Avoid text, screenshots, tiny details, and baked iOS rounded corners. - Locate existing assets and preserve configured names:
rg --files | rg 'Assets\.xcassets|AppIcon\.appiconset|\.icns$|Info\.plist|Contents\.json' rg 'ASSETCATALOG_COMPILER_APPICON_NAME|CFBundleIconFile|CFBundleIconName|AppIcon' - Generate or replace the platform asset:
# iOS asset catalog python3 <skill-dir>/scripts/generate_appiconset.py master-icon.png path/to/AppIcon.appiconset --platform ios --replace # macOS asset catalog python3 <skill-dir>/scripts/generate_appiconset.py master-icon.png path/to/AppIcon.appiconset --platform macos --replace # macOS bundle icon python3 <skill-dir>/scripts/generate_appiconset.py master-icon.png path/to/AppIcon.icns --platform macos --format icns --replace - Build/run and inspect the installed icon: simulator/home screen for iOS, or
the built
.appbundle, Dock, Finder, andInfo.plistfor macOS. Clear icon caches or reinstall when the old icon is cached.
ImageGen Prompt Contract
Use $imagegen for raster artwork. Ask for an Apple-platform app icon, square
1024x1024 master artwork, one main symbol/metaphor, centered composition,
strong contrast, 2-4 colors, no text/watermark/UI screenshot/flags/tiny
details/baked iOS mask/transparent background unless a macOS transparent icon
silhouette is explicitly desired.
What ships with it
5 files 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.
- 10d ago First seen · 100 lines · 40 tokens per session scan A f951f30ffdd9
app-icon-studio is a skill published in the GitHub repository Xopoko/build-swift-apps (45 stars, last pushed 13d ago), licensed MIT. It adds 40 tokens to every session and 1,030 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
Other skills, from other repositories
mobile-rn-screen
Polish an existing React Native screen to feel intentional, native, and human-crafted. Use for "this screen looks off", "feels clunky on iOS", "Android version looks wrong", "jank when scrolling", "button is unreachable", or any RN-specific UX polish pass.
apple-hig-sf-symbols
Use when choosing, reviewing, or implementing SF Symbols in an Apple-platform app — picking meaningful symbols, keeping the same concept on the same symbol everywhere, and handling variants, rendering modes, and accessibility.
apple-hig-toolbars
Use when designing, reviewing, or implementing Apple-platform toolbars — current-screen actions vs sidebar navigation, one primary action per screen, overflow menus, protected destructive actions, and keyboard shortcuts.
apple-hig-typography
Use when designing, reviewing, or implementing typography in Apple-platform apps — SwiftUI text styles, hierarchy, readable sizes, monospaced data, custom fonts, labels, captions, and accessibility.
Audit Apple-platform UI work against Human Interface Guidelines with HIG Doctor
Run a repeatable HIG compliance audit over app code before shipping UI changes, then use the findings to guide remediation.
apple-hig-empty-states
Use when designing or implementing empty, first-run, no-result, offline, error, or waiting states in Apple-platform apps — every empty state explains what is missing, why it matters, and what to do next.