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Agent skill

Swift Best Practices

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Apply Guard, Value Types, Immutability, and Naming conventions in Swift.

MITAuto-check passedMobile

Install Swift Best Practices

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill swift-best-practices -a claude-code

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

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard swift-best-practices --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/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/swift/swift-best-practices .claude/skills/swift-best-practices && 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/

Facts

Skill name
swift-best-practices
GitHub stars
572
Token cost
~725 tokens
SKILL.md length
283 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Apply Guard, Value Types, Immutability, and Naming conventions in Swift.

  • Writing idiomatic Swift with guard
  • SKILL.md covers Priority: P0 (CRITICAL), Implementation Guidelines, Anti-Patterns and References
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Naming conventions—not Swift concurrency/actor-isolation

What it does

Swift Best Practices is an agent skill from HoangNguyen0403/agent-skills-standard. Apply Guard, Value Types, Immutability, and Naming conventions in Swift. Use when writing idiomatic Swift with guard, value types, immutability, or naming conventions—not Swift concurrency/actor-isolation, persistence, linting, or release tooling.

Its SKILL.md is about 730 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/implementation.md`).

It sits in Mobile, covering iOS development. It works with Swift. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Writing idiomatic Swift with guard
  • Naming conventions—not Swift concurrency/actor-isolation
  • Release tooling

Example prompts

  • “/swift-best-practices”

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. 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.

    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 Best Practices loads about 725 tokens when it runs, and up to ~1.1k if it reads all its reference files. Until then it costs about 67 tokens; SKILL.md has 283 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~67
When it runs · the whole SKILL.md, loaded when a task matches
~725
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.1k

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 HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 283 words, ~725 tokens.

Download SKILL.mdSave it as .claude/skills/swift-best-practices/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
swift-best-practices
description
Apply Guard, Value Types, Immutability, and Naming conventions in Swift. Use when writing idiomatic Swift with guard, value types, immutability, or naming conventions—not Swift concurrency/actor-isolation, persistence, linting, or release tooling.

Swift Best Practices

Priority: P0 (CRITICAL)

Implementation Guidelines

Control Flow (Guard over If)
  • Guard for Early Exit: Use guard let over nested if statements for better readability and to unwrap optionals early.
  • Nested Checks: Use guard for precondition checks at top of function to reduce nested depth.
  • Switch Exhaustiveness: Always handle all cases; use @unknown default for freezing enums (enums from frameworks).
  • if-case: Use if case .success(let value) = result for simple enum pattern matching.
Value Types & Immutability
  • Prefer Structs: Default to struct for value semantics and thread safety. Use class only when reference identity or inheritance required.
  • Immutability: Always default to let for all properties and constants. Use var only when change required.
  • Modifiers: Use final for all classes that not intended to subclassed to improve performance (static dispatch).
  • Static Dispatch: Favor methods in structs and final classes.
Naming & Style
  • Clear Intent: Prefix booleans with is, has, or can. Example: isValid, hasErrors, canEdit. Makes boolean state clear.
  • API Guidelines: Follow official Swift API Design Guidelines. Use camelCase for clear names and PascalCase for types.
  • Protocols: Name protocols with -able, -ible, or -ing suffixes (e.g., Codable, Identifiable).
  • Opaque Types: Use some View or some Collection for return types where underlying type internal.
Collection Performance
  • Sequence API: Use compactMap, filter, and reduce instead of explicit for-where loops for data transformations.
  • Lazy Collections: Use .lazy for large sequences when result consumed partially.
  • Dictionaries: Use default values in dictionary access to avoid double optional unwrapping.

Anti-Patterns

  • No Pyramid of Doom: Use guard for early exits.
  • No force unwrap: Never use ! on optionals. Use ?? (nil-coalescing) or if let.
  • No global var: Avoid mutable global state. Use Singletons (accessed via static let shared) or DI.

References

© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/swift/swift-best-practices of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/implementation.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

Swift Best Practices 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 Best Practices compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Swift Best Practices this skillHoangNguyen0403/agent-skills-standard572—~725Automated safety check: PassMIT
Swift Concurrencydpearson2699/swift-ios-skills1.2k—~5kAutomated safety check: PassCustom licence
Memorygustavscirulis/snapgrid1161 repos~3kAutomated safety check: PassCustom licence
macOS Spm App PackagingDimillian/Skills4k5 repos~1.2kAutomated safety check: PassMIT
Swift Concurrency Protwostraws/Swift-Concurrency-Agent-Skill566—~1.4kAutomated safety check: PassMIT
Swiftui Expert SkillAFK-surf/OpenBridge4302 repos~3.9kAutomated safety check: PassMIT

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Works with

Categories

Questions about Swift Best Practices

What does Swift Best Practices do?

Apply Guard, Value Types, Immutability, and Naming conventions in Swift. Swift Best Practices is an agent skill from HoangNguyen0403/agent-skills-standard. Apply Guard, Value Types, Immutability, and Naming conventions in Swift.

When should I use Swift Best Practices?

Swift Best Practices fits situations like: writing idiomatic Swift with guard; naming conventions—not Swift concurrency/actor-isolation; release tooling.

How do I install Swift Best Practices in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill swift-best-practices -a claude-code`. Or copy the skill folder (skills/swift/swift-best-practices in HoangNguyen0403/agent-skills-standard) into .claude/skills/swift-best-practices in your project. Claude Code loads it when a task matches its description.

How do I install Swift Best Practices in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill swift-best-practices -a codex`. Or copy the skill folder (skills/swift/swift-best-practices in HoangNguyen0403/agent-skills-standard) into .agents/skills/swift-best-practices in your project. Codex loads it when a task matches its description.

Can I use Swift Best Practices 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 HoangNguyen0403/agent-skills-standard --skill swift-best-practices -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-best-practices, .gemini/skills/swift-best-practices, .github/skills/swift-best-practices and .opencode/skills/swift-best-practices in your project.

What does Swift Best Practices need to run?

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

Does Swift Best Practices 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 Best Practices 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 Best Practices use?

Swift Best Practices 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 Best Practices use?

About 725 tokens (SKILL.md is roughly 2.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 409 tokens, read only when the agent opens those files.

What are the alternatives to Swift Best Practices?

Skills that share tags, products or a category with Swift Best Practices: Swift Concurrency (dpearson2699/swift-ios-skills, 1.2k stars), Memory (gustavscirulis/snapgrid, 116 stars), macOS Spm App Packaging (Dimillian/Skills, 4k stars) and Swift Concurrency Pro (twostraws/Swift-Concurrency-Agent-Skill, 566 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Swift Best Practices?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.