Icon sets for Apple platforms

Turns one source image into a complete, HIG-correct set of app icons for iOS, iPadOS, macOS, visionOS and Tauri. It checks the image first, then writes the asset catalogs, .icns and Tauri icon files, with nothing to install on a Mac beyond Xcode's command line tools.

Agent-agnostic: nothing here depends on a specific coding agent — only on a shell. Commands write <skill-dir> for this skill's directory; resolve it to wherever your agent installed the skill (Claude Code exposes it as ${CLAUDE_SKILL_DIR}; otherwise it is the directory containing this SKILL.md). The working directory is the user's project.

Requirements — check the platform first. The native toolchain is macOS: sips, iconutil, swift from Xcode Command Line Tools, no installs. Run uname -s (or equivalent) before promising anything, and on anything other than macOS tell the user up front, in plain terms, what works on their machine and what doesn't — then proceed with what does:

• macOS → everything below, natively.
• Linux / Windows (WSL or Git Bash) → Tauri projects keep full support: tauri icon is Rust and cross-platform, .icns included, and the margin fix routes through it (references/tauri.md). Asset-catalog PNGs and Contents.json files need ImageMagick 7 — command equivalents are in the "Non-macOS fallbacks" section of references/platform-recipes.md. A bare .icns outside a Tauri project is the one thing that genuinely needs png2icns, a Mac, or CI — say so rather than approximating.

Never discover a missing sips mid-run: state the limitation before generating, and never silently drop the macOS margin treatment because the native tool is absent.

Step 0 — establish source and targets

• Source: the image path from the arguments or conversation. No path → ask for one; never invent or generate artwork unless the user asks.
• Targets: --platform wins. Otherwise detect: src-tauri/tauri.conf.json → tauri; an .xcodeproj/Assets.xcassets → the Xcode platforms it targets; neither → ask, defaulting to all written under ./AppIcons/<platform>/. --out overrides the destination. ipados is the ios recipe (universal appiconset).

Step 1 — validate, then look at it (gate)