Is the Programming Swift skill free?

Yes. The skill itself is free from kylehughes/the-unofficial-swift-programming-language-skill. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Programming Swift SkillProof Score?

8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.

How do I install Programming Swift?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Programming Swift with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Programming Swift

Apple's full Swift book (6.4 beta) as an offline language-reference skill

by kylehughes · kylehughes/the-unofficial-swift-programming-language-skill

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 8.8/10
Tested: Jul 17, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 07c23cc

Compiled a typed-throws demo both ways on Swift 6.0.3: the no-skill baseline already got every rule right, so on mainstream syntax the book verifies rather than corrects. Where it earns its keep is currency and precision — the bundled 6.4-beta text carries file-level `using @MainActor` / `using nonisolated` isolation defaults and formal grammar productions that model memory cannot reliably reproduce. All 41 chapter files ship in the repo and the copy-install worked verbatim from a bare HOME. Honest packaging of Apple's TSPL book, auto-updated nightly.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 7/10
Docs & honesty 5/5

What Programming Swift does

Ships the complete text of The Swift Programming Language (6.4 beta) — 41 chapters across Guided Tour, Language Guide, and the formal Reference Manual — as a Claude skill. Triggers when you need to verify Swift syntax, resolve compiler errors, or consult the authoritative grammar, and it is auto-regenerated nightly from Apple's upstream swift-book repo.

How to install Programming Swift

git clone https://github.com/kylehughes/the-unofficial-swift-programming-language-skill
mkdir -p ~/.claude/skills
cp -r the-unofficial-swift-programming-language-skill/programming-swift ~/.claude/skills/programming-swift

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Programming Swift

/programming-swift Apple's full Swift book (6.4 beta) as an offline language-reference skill

It also activates on plain-language prompts like these:

What's the correct syntax for typed throws in Swift 6?
Check this Swift code against the official language grammar
How does nonisolated interact with MainActor in Swift 6.4?

Frequently asked questions

Is the Programming Swift skill free?: Yes. The skill itself is free from kylehughes/the-unofficial-swift-programming-language-skill. SkillProof publishes the install command and an independent test verdict at no cost.
Does Programming Swift work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 17, 2026. Verdict: Tested · Works. Compiled a typed-throws demo both ways on Swift 6.0.3: the no-skill baseline already got every rule right, so on mainstream syntax the book verifies rather than corrects. Where it earns its keep is currency and precision — the bundled 6.4-beta text carries file-level `using @MainActor` / `using nonisolated` isolation defaults and formal grammar productions that model memory cannot reliably reproduce. All 41 chapter files ship in the repo and the copy-install worked verbatim from a bare HOME. Honest packaging of Apple's TSPL book, auto-updated nightly.
What is the Programming Swift SkillProof Score?: 8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.
How do I install Programming Swift?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Programming Swift with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.