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Agent skill

Swift Language

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Apply Optionals, Protocols, Extensions, and Type Safety patterns in Swift.

MITAuto-check passedDevelopment

Install Swift Language

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

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

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard swift-language --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-language .claude/skills/swift-language && 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-language
GitHub stars
572
Token cost
~557 tokens
SKILL.md length
216 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Apply Optionals, Protocols, Extensions, and Type Safety patterns in Swift.

  • Working with Swift Optionals
  • SKILL.md covers Priority: P0 (CRITICAL), Implementation Guidelines, Anti-Patterns and References, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Tasks that involve Type safety

What it does

Swift Language is an agent skill from HoangNguyen0403/agent-skills-standard. Apply Optionals, Protocols, Extensions, and Type Safety patterns in Swift. Use when working with Swift Optionals, Protocols, Extensions, or type-safe APIs.

Its SKILL.md is about 560 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 Development, covering Type safety and 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

  • Working with Swift Optionals
  • Tasks that involve Type safety
  • Tasks that involve iOS development

Example prompts

  • “/swift-language”

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 Language loads about 557 tokens when it runs, and up to ~917 if it reads all its reference files. Until then it costs about 43 tokens; SKILL.md has 216 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
~557
With references · SKILL.md plus every file in references/, read only if the agent opens them
~917

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). 216 words, ~557 tokens.

Download SKILL.mdSave it as .claude/skills/swift-language/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
swift-language
description
Apply Optionals, Protocols, Extensions, and Type Safety patterns in Swift. Use when working with Swift Optionals, Protocols, Extensions, or type-safe APIs.

Swift Language Standards

Priority: P0 (CRITICAL)

Implementation Guidelines

Optionals & Safety
  • Never Force Unwrap: Use guard let, if let, or nil coalescing (??) to safely unwrap.
  • Nil Comparison: Use value != nil instead of if let _ = value.
  • Implicitly Unwrapped: Avoid Type!. Use proper Type?.
Protocols & Extensions
  • Protocols as Blueprints: Protocols define blueprint; classes inherit implementation.
  • Composition over Inheritance: Prefer protocol composition with structs for better decoupling and performance.
  • Extensions: Implement conformance in extension: extension MyType: MyProtocol { ... }. Use extensions for clean code organization, not storage ( not use extensions for stored properties).
  • Protocol Witnesses: Explicitly implement all required members to satisfy witness table.
Type Safety
  • Avoid Any: Use generics or associated types instead for compile-time safety.
  • Enums: Prefer enums with associated values over multiple Optionals. Extract values via switch statement (e.g., case .success(let value):).
  • Value Types: Default to struct for value semantics and thread safety. Use class only when reference identity necessary or for inheritance. Structs copied; classes shared.

Anti-Patterns

  • No ! operator: Use safe unwrapping.
  • No -1 for failure: Use Optional.
  • No force cast (as!): Use conditional cast (as?).

References

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • Default to struct

  • Never force unwrap

  • associated values

  • value types

  • Additional task-grounded exact anchors: extension MyType: MyProtocol; conformance

© 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-language 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 Language 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 Language compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Swift Language this skillHoangNguyen0403/agent-skills-standard572—~557Automated safety check: PassMIT
Swift Concurrencyhenrypldev/react-native-nitro-mlx1003 repos~3.1kAutomated safety check: PassMIT
Core Data ExpertAvdLee/Core-Data-Agent-Skill315—~1.2kAutomated safety check: PassMIT
Swift Concurrencynimblehq/ios-templates110—~1.7kAutomated safety check: PassMIT
Swift Concurrencyjamesrochabrun/skills216—~1.9kAutomated safety check: PassMIT
Concurrency Patternsgustavscirulis/snapgrid1161 repos~1.2kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about Swift Language

What does Swift Language do?

Apply Optionals, Protocols, Extensions, and Type Safety patterns in Swift. Swift Language is an agent skill from HoangNguyen0403/agent-skills-standard. Apply Optionals, Protocols, Extensions, and Type Safety patterns in Swift.

When should I use Swift Language?

Swift Language fits situations like: working with Swift Optionals; tasks that involve Type safety; tasks that involve iOS development.

How do I install Swift Language in Claude Code?

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

How do I install Swift Language in Codex?

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

Can I use Swift Language 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-language -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-language, .gemini/skills/swift-language, .github/skills/swift-language and .opencode/skills/swift-language in your project.

What does Swift Language need to run?

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

Does Swift Language 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 Language 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 Language use?

Swift Language 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 Language use?

About 557 tokens (SKILL.md is roughly 2.2k 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 360 tokens, read only when the agent opens those files.

What are the alternatives to Swift Language?

Skills that share tags, products or a category with Swift Language: Swift Concurrency (henrypldev/react-native-nitro-mlx, 100 stars), Core Data Expert (AvdLee/Core-Data-Agent-Skill, 315 stars), Swift Concurrency (nimblehq/ios-templates, 110 stars) and Swift Concurrency (jamesrochabrun/skills, 216 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Swift Language?

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.