Agent skill

Swift Style

by johnrogers in johnrogers/claude-swift-engineering

Swift code style conventions for clean, readable code. An agent skill from johnrogers/claude-swift-engineering.

MITAuto-check passedMobile

Install Swift Style

skills CLI

$ npx skills add johnrogers/claude-swift-engineering --skill swift-style -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install johnrogers/claude-swift-engineering swift-style --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/johnrogers/claude-swift-engineering.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/swift-engineering/skills/swift-style .claude/skills/swift-style && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "swift-style" agent skill from https://github.com/johnrogers/claude-swift-engineering/tree/main/plugins/swift-engineering/skills/swift-style into .claude/skills/swift-style/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-style", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/johnrogers/claude-swift-engineering/tree/main/plugins/swift-engineering/skills/swift-style

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add johnrogers/claude-swift-engineering --skill swift-style -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install johnrogers/claude-swift-engineering swift-style --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/johnrogers/claude-swift-engineering.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/swift-engineering/skills/swift-style .agents/skills/swift-style && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "swift-style" agent skill from https://github.com/johnrogers/claude-swift-engineering/tree/main/plugins/swift-engineering/skills/swift-style into .agents/skills/swift-style/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-style", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add johnrogers/claude-swift-engineering --skill swift-style -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install johnrogers/claude-swift-engineering swift-style --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/johnrogers/claude-swift-engineering.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/swift-engineering/skills/swift-style .cursor/skills/swift-style && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "swift-style" agent skill from https://github.com/johnrogers/claude-swift-engineering/tree/main/plugins/swift-engineering/skills/swift-style into .cursor/skills/swift-style/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-style", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/johnrogers/claude-swift-engineering.git --path plugins/swift-engineering/skills/swift-style

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add johnrogers/claude-swift-engineering --skill swift-style -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install johnrogers/claude-swift-engineering swift-style --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/johnrogers/claude-swift-engineering.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/swift-engineering/skills/swift-style .gemini/skills/swift-style && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "swift-style" agent skill from https://github.com/johnrogers/claude-swift-engineering/tree/main/plugins/swift-engineering/skills/swift-style into .gemini/skills/swift-style/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-style", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install johnrogers/claude-swift-engineering swift-style

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add johnrogers/claude-swift-engineering --skill swift-style -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/johnrogers/claude-swift-engineering.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/swift-engineering/skills/swift-style .github/skills/swift-style && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "swift-style" agent skill from https://github.com/johnrogers/claude-swift-engineering/tree/main/plugins/swift-engineering/skills/swift-style into .github/skills/swift-style/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-style", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add johnrogers/claude-swift-engineering --skill swift-style -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install johnrogers/claude-swift-engineering swift-style --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/johnrogers/claude-swift-engineering.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/swift-engineering/skills/swift-style .opencode/skills/swift-style && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "swift-style" agent skill from https://github.com/johnrogers/claude-swift-engineering/tree/main/plugins/swift-engineering/skills/swift-style into .opencode/skills/swift-style/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-style", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: swift-style
GitHub stars: 231
Token cost: ~828 tokens
SKILL.md length: 268 words
Files: 1
Skills in repo: 17
Repo updated: Jan 18, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Swift code style conventions for clean, readable code. An agent skill from johnrogers/claude-swift-engineering.

Works in 5 steps: Abbreviations beyond URL, ID, UUID —… → Nested guard/if statements — Deep… → Inconsistent self usage — Either always… → …
Writing Swift code to ensure consistent formatting
SKILL.md covers Core Principles, Naming, Golden Path and Code Organization, plus 11 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Swift Style is an agent skill from johnrogers/claude-swift-engineering. Swift code style conventions for clean, readable code. Use when writing Swift code to ensure consistent formatting, naming, organization, and idiomatic patterns.

Its SKILL.md is about 830 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Mobile, covering iOS development. The repository describes itself as: A collection of agents and skills to aid in the planning, implementation, documentation and testing of Swift/TCA code. The licence is MIT.

When your agent uses it

Writing Swift code to ensure consistent formatting
Idiomatic patterns

Example prompts

“/swift-style”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

Abbreviations beyond URL, ID, UUID — Abbreviations like cfg, mgr, ctx, desc hurt readability. Spell them out: configuration, manager…
Nested guard/if statements — Deep nesting makes code hard to follow. Use early returns and guards to keep the happy path left-aligned.
Inconsistent self usage — Either always omit self (preferred) or always use it. Mixing makes code scanning harder and confuses capture…
Overly generic type names — Manager, Handler, Helper, Coordinator are too vague. Names should explain responsibility: PaymentProcessor…
Implied access control — Don't skip access control. Explicit private, public helps future maintainers understand module boundaries…

What it can do on your machine

Read from SKILL.md and the folder at commit 1dc2cf4. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are swift).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Swift Style loads about 828 tokens when it runs. Until then it costs about 43 tokens; SKILL.md has 268 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~43
When it runs · the whole SKILL.md, loaded when a task matches: ~828

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from johnrogers/claude-swift-engineering at commit 1dc2cf4, republished under its MIT licence (© johnrogers). 268 words, ~828 tokens.

Download SKILL.mdSave it as .claude/skills/swift-style/SKILL.md (or your agent's skills folder).

name: swift-style
description: Swift code style conventions for clean, readable code. Use when writing Swift code to ensure consistent formatting, naming, organization, and idiomatic patterns.

Swift Style Guide

Code style conventions for clean, readable Swift code.

Core Principles

Clarity > Brevity > Consistency

Code should compile without warnings.

Naming

UpperCamelCase — Types, protocols
lowerCamelCase — Everything else
Clarity at call site
No abbreviations except universal (URL, ID)

swift

// Preferred
let maximumWidgetCount = 100
func fetchUser(byID id: String) -> User

Golden Path

Left-hand margin is the happy path. Don't nest if statements.

swift

// Preferred
func process(value: Int?) throws -> Result {
    guard let value = value else {
        throw ProcessError.nilValue
    }
    guard value > 0 else {
        throw ProcessError.invalidValue
    }
    return compute(value)
}

Code Organization

Use extensions and MARK comments:

swift

class MyViewController: UIViewController {
    // Core implementation
}

// MARK: - UITableViewDataSource
extension MyViewController: UITableViewDataSource { }

Spacing

Braces open on same line, close on new line
One blank line between methods
Colon: no space before, one space after

Self

Avoid self unless required by compiler.

swift

// Preferred
func configure() {
    backgroundColor = .systemBackground
}

Computed Properties

Omit get for read-only:

swift

var diameter: Double {
    radius * 2
}

Closures

Trailing closure only for single closure parameter.

Type Inference

Let compiler infer when clear. For empty collections, use type annotation:

swift

var names: [String] = []

Syntactic Sugar

swift

// Preferred
var items: [String]
var cache: [String: Int]
var name: String?

Access Control

private over fileprivate
Don't add internal (it's the default)
Access control as leading specifier

Memory Management

swift

resource.request().onComplete { [weak self] response in
    guard let self else { return }
    self.updateModel(response)
}

Comments

Explain why, not what
Use // or ///, avoid /* */
Keep up-to-date or delete

Constants

Use case-less enum for namespacing:

swift

enum Math {
    static let pi = 3.14159
}

Common Mistakes

Abbreviations beyond URL, ID, UUID — Abbreviations like cfg, mgr, ctx, desc hurt readability. Spell them out: configuration, manager, context, description. The three exceptions are URL, ID, UUID.
Nested guard/if statements — Deep nesting makes code hard to follow. Use early returns and guards to keep the happy path left-aligned.
Inconsistent self usage — Either always omit self (preferred) or always use it. Mixing makes code scanning harder and confuses capture semantics.
Overly generic type names — Manager, Handler, Helper, Coordinator are too vague. Names should explain responsibility: PaymentProcessor, EventDispatcher, ImageCache, NavigationCoordinator.
Implied access control — Don't skip access control. Explicit private, public helps future maintainers understand module boundaries. internal is default, so omit it.

Files

Just SKILL.md in plugins/swift-engineering/skills/swift-style of johnrogers/claude-swift-engineering.

Open the folder on GitHubat commit 1dc2cf4

Compare with similar skills

Swift Style next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Swift Style compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Swift Style this skilljohnrogers/claude-swift-engineering	231	—	~828	Automated safety check: Pass	MIT	8 mo ago
Swiftui Protwostraws/SwiftUI-Agent-Skill	5.2k	2 repos	~1.5k	Automated safety check: Pass	MIT	2 days ago
Swiftui UI PatternsAFK-surf/OpenBridge	430	4 repos	~887	Automated safety check: Pass	MIT	4 mo ago
Swiftui Performance Auditharperreed/dotfiles	334	8 repos	~1.4k	Automated safety check: Pass	None	6 days ago
Swift Testing ExpertAvdLee/Swift-Testing-Agent-Skill	470	1 repos	~1.2k	Automated safety check: Pass	MIT	25 days ago
Hig Project Contextraintree-technology/hig-doctor	143	5 repos	~1.2k	Automated safety check: Pass	MIT	28 days ago

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Questions about Swift Style

What does Swift Style do?

Swift code style conventions for clean, readable code. An agent skill from johnrogers/claude-swift-engineering. Swift Style is an agent skill from johnrogers/claude-swift-engineering. Swift code style conventions for clean, readable code.

When should I use Swift Style?

Swift Style fits situations like: writing Swift code to ensure consistent formatting; idiomatic patterns.

How do I install Swift Style in Claude Code?

Run `npx skills add johnrogers/claude-swift-engineering --skill swift-style -a claude-code`. Or copy the skill folder (plugins/swift-engineering/skills/swift-style in johnrogers/claude-swift-engineering) into .claude/skills/swift-style in your project. Claude Code loads it when a task matches its description.

How do I install Swift Style in Codex?

Run `npx skills add johnrogers/claude-swift-engineering --skill swift-style -a codex`. Or copy the skill folder (plugins/swift-engineering/skills/swift-style in johnrogers/claude-swift-engineering) into .agents/skills/swift-style in your project. Codex loads it when a task matches its description.

Can I use Swift Style in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add johnrogers/claude-swift-engineering --skill swift-style -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/swift-style, .gemini/skills/swift-style, .github/skills/swift-style and .opencode/skills/swift-style in your project.

What does Swift Style need to run?

SKILL.md names no scripts, command-line tools or credentials: Swift Style is instructions for the agent only.

Does Swift Style access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Swift Style safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Swift Style use?

Swift Style is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Swift Style use?

About 828 tokens (SKILL.md is roughly 3.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Swift Style?

Skills that share tags, products or a category with Swift Style: Swiftui Pro (twostraws/SwiftUI-Agent-Skill, 5.2k stars), Swiftui UI Patterns (AFK-surf/OpenBridge, 430 stars), Swiftui Performance Audit (harperreed/dotfiles, 334 stars) and Swift Testing Expert (AvdLee/Swift-Testing-Agent-Skill, 470 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Swift Style?

johnrogers (a GitHub user) maintains it in johnrogers/claude-swift-engineering, which has 231 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on January 18, 2026.

Source: johnrogers/claude-swift-engineering on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Swift Style

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Swift Style Guide

Core Principles

Naming

Golden Path

Code Organization

Spacing

Self

Computed Properties

Closures

Type Inference

Syntactic Sugar

Access Control

Memory Management

Comments

Constants

Common Mistakes

Files

Compare with similar skills

Similar skills

More from johnrogers/claude-swift-engineering

Related

Questions about Swift Style