Swift FormatStyle Agent Skill

An agent skill that helps AI coding agents like Claude Code, Codex, Cursor, and Gemini write modern Swift formatting code using `FormatStyle` and `.formatted()` APIs instead of legacy `Formatter` subclasses and C-style `String(format:)`.

It uses the [Agent Skills](https://agentskills.io/home) format, so it works smoothly with Claude Code, Codex, Gemini, Cursor, and more.

What It Covers

• Number, Percent, Currency - precision, rounding, sign, notation, scale, grouping, locale
• Date/Time - compositing, presets, ISO 8601, relative, anchored relative, verbatim, HTTP
• Date Ranges - interval and components styles
• Duration - time patterns (HH:MM:SS) and units (human-readable)
• Measurement - locale-aware unit conversion for length, mass, temperature, speed, etc.
• List - array-to-text with "and"/"or" joining
• Person Name - locale-aware name ordering
• Byte Count - file/memory size display
• URL - component-level formatting and parsing
• Custom FormatStyle - creating your own
• Anti-patterns - catches String(format:), DateFormatter, NumberFormatter, and other legacy code

Installing

You can install this skill into Claude Code, Codex, Gemini, Cursor, and more by using `npx`:

npx skills add https://github.com/n0an/Swift-FormatStyle-Agent-Skill --skill swift-format-style

If you get the error `npx: command not found`, it means you don't currently have Node installed. You need to run this command to in