Swiftui Pro
twostraws/SwiftUI-Agent-Skill
Comprehensively reviews SwiftUI code for best practices on modern APIs, maintainability, and performance.
Enforce complexity and size limits on Swift code with SwiftLint threshold rules — cyclomatic complexity, function/type/file length, parameter count — adopted via a violations baseline so existing…
Install Code Size
$ npx skills add rshankras/claude-code-apple-skills --skill code-size -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install rshankras/claude-code-apple-skills code-size --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/rshankras/claude-code-apple-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/swift/code-size .claude/skills/code-size && rm -rf skills-srcUse ~/.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/
Install the "code-size" agent skill from https://github.com/rshankras/claude-code-apple-skills/tree/main/skills/swift/code-size into .claude/skills/code-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-size", 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 install https://github.com/rshankras/claude-code-apple-skills/tree/main/skills/swift/code-sizeType 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.
$ npx skills add rshankras/claude-code-apple-skills --skill code-size -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install rshankras/claude-code-apple-skills code-size --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/rshankras/claude-code-apple-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/swift/code-size .agents/skills/code-size && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "code-size" agent skill from https://github.com/rshankras/claude-code-apple-skills/tree/main/skills/swift/code-size into .agents/skills/code-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-size", 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.
$ npx skills add rshankras/claude-code-apple-skills --skill code-size -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install rshankras/claude-code-apple-skills code-size --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/rshankras/claude-code-apple-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/swift/code-size .cursor/skills/code-size && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "code-size" agent skill from https://github.com/rshankras/claude-code-apple-skills/tree/main/skills/swift/code-size into .cursor/skills/code-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-size", 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 https://github.com/rshankras/claude-code-apple-skills.git --path skills/swift/code-size--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add rshankras/claude-code-apple-skills --skill code-size -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install rshankras/claude-code-apple-skills code-size --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/rshankras/claude-code-apple-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/swift/code-size .gemini/skills/code-size && rm -rf skills-srcUse ~/.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/
Install the "code-size" agent skill from https://github.com/rshankras/claude-code-apple-skills/tree/main/skills/swift/code-size into .gemini/skills/code-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-size", 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.
$ gh skill install rshankras/claude-code-apple-skills code-sizeInstalls 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).
$ npx skills add rshankras/claude-code-apple-skills --skill code-size -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/rshankras/claude-code-apple-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/swift/code-size .github/skills/code-size && rm -rf skills-srcUse ~/.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/
Install the "code-size" agent skill from https://github.com/rshankras/claude-code-apple-skills/tree/main/skills/swift/code-size into .github/skills/code-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-size", 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.
$ npx skills add rshankras/claude-code-apple-skills --skill code-size -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install rshankras/claude-code-apple-skills code-size --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/rshankras/claude-code-apple-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/swift/code-size .opencode/skills/code-size && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "code-size" agent skill from https://github.com/rshankras/claude-code-apple-skills/tree/main/skills/swift/code-size into .opencode/skills/code-size/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-size", 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
code-size- GitHub stars
- 783
- Token cost
- ~1.1k tokens
- SKILL.md length
- 441 words
- Files
- 2
- Skills in repo
- 41
- Repo updated
- First seen
- Licence
- MIT
At a glance
Enforce complexity and size limits on Swift code with SwiftLint threshold rules — cyclomatic complexity, function/type/file length, parameter count — adopted via a violations baseline so existing…
- Agent-written code needs deterministic size constraints
- SKILL.md covers When This Skill Activates, The Rules, Brownfield Adoption: Baseline,… and When a Rule Fires, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Tasks that involve iOS development
What it does
Code Size is an agent skill from rshankras/claude-code-apple-skills. Enforce complexity and size limits on Swift code with SwiftLint threshold rules — cyclomatic complexity, function/type/file length, parameter count — adopted via a violations baseline so existing code never blocks. Use when agent-written code needs deterministic size constraints.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `rules/swiftlint.yml`).
It sits in Mobile, covering iOS development. The repository describes itself as: Claude Code skills for Apple platform development (iOS, macOS, iPadOS) — product validation, code generation, App Store optimization, and more. The licence is MIT.
When your agent uses it
- Agent-written code needs deterministic size constraints
- Tasks that involve iOS development
Example prompts
- “/code-size”
Requirements
- Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep, Bash
What it can do on your machine
Read from SKILL.md and the folder at commit 9ffb831. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadWriteEditGlobGrepBash
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 bash).
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
Code Size loads about 1.1k tokens when it runs. Until then it costs about 73 tokens; SKILL.md has 441 words of instructions outside code blocks.
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: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Read, Write, Edit, Glob, Grep, Bash
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 rshankras/claude-code-apple-skills at commit 9ffb831, republished under its MIT licence (© rshankras). 441 words, ~1,082 tokens.
Download SKILL.mdSave it as
.claude/skills/code-size/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- code-size
- description
- Enforce complexity and size limits on Swift code with SwiftLint threshold rules — cyclomatic complexity, function/type/file length, parameter count — adopted via a violations baseline so existing code never blocks. Use when agent-written code needs deterministic size constraints.
- allowed-tools
- Read, Write, Edit, Glob, Grep, Bash
- last_verified
- 2026-07-24
- review_by
- 2027-07-01
Code Size & Complexity Limits
Complexity is the strongest single predictor of defect density, and code written by agents balloons fastest — an agent under pressure adds one more branch to an existing function far more readily than it extracts a new one. These five SwiftLint threshold rules are the deterministic cap: they keep functions small enough that tests can actually cover their branches, and they keep agents from wrangling with their own tangles.
When This Skill Activates
Use this skill when:
- Setting up quality gates for a project where agents write most of the code
- A review keeps flagging "this function is too long/branchy" by hand
- Functions have grown past what their tests plausibly cover
- Adopting the deterministic gauntlet (see
testing/fitness-functions/)
The Rules
The fragment at rules/swiftlint.yml configures five built-in SwiftLint rules (all enabled by default in SwiftLint — this fragment sets the thresholds):
| Rule | Warning | Error | What it caps |
|---|---|---|---|
cyclomatic_complexity | 10 | 20 | Independent paths through one function |
function_body_length | 50 | 100 | Lines per function body |
type_body_length | 300 | 500 | Lines per type body |
file_length | 500 | 1000 | Lines per file |
function_parameter_count | 5 | 8 | Parameters per function |
Merge the fragment into the project's .swiftlint.yml (alongside any opt_in_rules/custom_rules fragments already adopted).
Brownfield Adoption: Baseline, Never Mass-Refactor
Turning these rules on in an existing codebase must not trigger a refactoring spree — bulk rewrites to satisfy a linter are how working code gets broken. Freeze today's violations and gate only new ones:
# One-time: record existing violations (SwiftLint 0.55+)
swiftlint lint --write-baseline .swiftlint-baseline.json
# The gate from then on — fails only on NEW violations
swiftlint lint --strict --baseline .swiftlint-baseline.jsonCommit .swiftlint-baseline.json. Shrink it opportunistically: when touching a baselined function for other reasons, fix its violation and regenerate the baseline in the same commit.
Fallback for older SwiftLint (before 0.55, no baseline support): record the violation count instead —
swiftlint lint --quiet | wc -l > .swiftlint-count
# Gate: current count must not exceed the committed countShow full SKILL.md (169 more words)Show less
When a Rule Fires
The fix is structural, not suppressive:
cyclomatic_complexity/function_body_length→ extract the branches into named functions, or replace the branch ladder with a table/enum dispatchtype_body_length/file_length→ split by responsibility (extensions in separate files count separately)function_parameter_count→ introduce a parameter struct
// swiftlint:disable is not a fix. The rare legitimate exemption (a generated file, a big-but-flat data table) belongs in .swiftlint.yml's excluded: list with a comment — visible in one place, not scattered through source.
Common Pitfalls
| Pitfall | Problem | Solution |
|---|---|---|
| Enabling without a baseline | Day-one wall of violations, gate ignored | --write-baseline first, gate on new only |
| Mass-refactoring to satisfy thresholds | Working code broken for a number | Freeze old violations; fix opportunistically |
Inline swiftlint:disable comments | Exemptions scattered and invisible | excluded: list in config, with reasons |
| Thresholds loosened per-project | Cap quietly stops capping | Change thresholds only with a written reason |
References
testing/fitness-functions/— set/count invariants a per-line rule can't expresstesting/coverage-ratchet/— the coverage half of the metrics gauntletios/coding-best-practices/— iOS-specific lint fragment (style/API rules)generators/ci-cd-setup/— base.swiftlint.ymltemplate these fragments merge into
© rshankras, 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 1 other file in skills/swift/code-size of rshankras/claude-code-apple-skills.
- SKILL.md
- rules/swiftlint.yml
Open the folder on GitHubat commit 9ffb831
Compare with similar skills
Code Size 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Code Size this skillrshankras/claude-code-apple-skills | 783 | — | ~1.1k | Automated safety check: Notes | MIT | |
| Swiftui Protwostraws/SwiftUI-Agent-Skill | 5.1k | 2 repos | ~1.5k | Automated safety check: Pass | MIT | |
| Swiftui UI PatternsAFK-surf/OpenBridge | 430 | 4 repos | ~887 | Automated safety check: Pass | MIT | |
| Swiftui Performance Auditharperreed/dotfiles | 334 | 8 repos | ~1.4k | Automated safety check: Pass | None | |
| Swift Testing ExpertAvdLee/Swift-Testing-Agent-Skill | 469 | 1 repos | ~1.2k | Automated safety check: Pass | MIT | |
| Hig Project Contextraintree-technology/hig-doctor | 143 | 5 repos | ~1.2k | Automated safety check: Pass | MIT |
Similar skills
Swiftui UI Patterns
AFK-surf/OpenBridge
Best practices and example-driven guidance for building SwiftUI views and components.
Swiftui Performance Audit
harperreed/dotfiles
Audit and improve SwiftUI runtime performance from code review and architecture.
Swift Testing Expert
AvdLee/Swift-Testing-Agent-Skill
Expert guidance for Swift Testing: test structure, expect/require macros, traits and tags, parameterized tests, test plans, parallel execution, async waiting patterns, and XCTest migration.
Hig Project Context
raintree-technology/hig-doctor
Create or update a shared Apple design context document that other HIG skills use to tailor guidance.
Swift Testing Pro
twostraws/Swift-Testing-Agent-Skill
Writes, reviews, and improves Swift Testing code using modern APIs and best practices.
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Questions about Code Size
What does Code Size do?
Enforce complexity and size limits on Swift code with SwiftLint threshold rules — cyclomatic complexity, function/type/file length, parameter count — adopted via a violations baseline so existing…. Code Size is an agent skill from rshankras/claude-code-apple-skills. Enforce complexity and size limits on Swift code with SwiftLint threshold rules — cyclomatic complexity, function/type/file length, parameter count — adopted via a violations baseline so existing code never blocks.
When should I use Code Size?
Code Size fits situations like: agent-written code needs deterministic size constraints; tasks that involve iOS development.
How do I install Code Size in Claude Code?
Run `npx skills add rshankras/claude-code-apple-skills --skill code-size -a claude-code`. Or copy the skill folder (skills/swift/code-size in rshankras/claude-code-apple-skills) into .claude/skills/code-size in your project. Claude Code loads it when a task matches its description.
How do I install Code Size in Codex?
Run `npx skills add rshankras/claude-code-apple-skills --skill code-size -a codex`. Or copy the skill folder (skills/swift/code-size in rshankras/claude-code-apple-skills) into .agents/skills/code-size in your project. Codex loads it when a task matches its description.
Can I use Code Size 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 rshankras/claude-code-apple-skills --skill code-size -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/code-size, .gemini/skills/code-size, .github/skills/code-size and .opencode/skills/code-size in your project.
What does Code Size need to run?
SKILL.md names no scripts, command-line tools or credentials: Code Size is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write, Edit, Glob, Grep, Bash.
Does Code Size 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 Code Size safe to install?
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.
What licence does Code Size use?
Code Size 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 Code Size use?
About 1.1k tokens (SKILL.md is roughly 4.3k 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 Code Size?
Skills that share tags, products or a category with Code Size: Swiftui Pro (twostraws/SwiftUI-Agent-Skill, 5.1k 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, 469 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Code Size?
rshankras (a GitHub user) maintains it in rshankras/claude-code-apple-skills, which has 783 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on July 24, 2026.
Source: rshankras/claude-code-apple-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.