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Agent skill

Mobile Principles

by AThevon in AThevon/genjutsu

Mobile-specific UX principles - touch targets, hover-less doctrine, thumb zones, safe areas, gestures, mobile perf budgets.

Custom licenceAuto-check passedMobile

Install Mobile Principles

skills CLI
$ npx skills add AThevon/genjutsu --skill mobile-principles -a claude-code

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

GitHub CLI
$ gh skill install AThevon/genjutsu mobile-principles --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/AThevon/genjutsu.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/_jutsu/mobile-principles .claude/skills/mobile-principles && 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
mobile-principles
GitHub stars
424
Used in
1 other repo
Token cost
~2.8k tokens
SKILL.md length
836 words
Files
3 (incl. references)
Skills in repo
20
Repo updated
First seen
Licence
Custom licence

At a glance

Mobile-specific UX principles - touch targets, hover-less doctrine, thumb zones, safe areas, gestures, mobile perf budgets.

  • Works in 3 steps: Hover as the only reveal → Sub-minimum touch targets → Ignoring safe area insets
  • Tasks that involve Mobile UI design
  • SKILL.md covers Touch Targets, No-Hover Doctrine, Thumb Zones (Hoober) and Safe Areas, plus 6 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Mobile Principles is an agent skill from AThevon/genjutsu. Mobile-specific UX principles - touch targets, hover-less doctrine, thumb zones, safe areas, gestures, mobile perf budgets. Cross-platform (web mobile, iOS, Android).

Its SKILL.md is about 2.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/accessibility-mobile.md` and `references/gestures-deep.md`).

It sits in Mobile, covering Mobile UI design. It works with iOS and Android. The repository describes itself as: Creative coding skills for Claude Code, claude.ai and Cowork. Motion, micro-interactions and design systems across Web (GSAP, Motion, Three.js, CSS), Android (Jetpack Compose)…

When your agent uses it

  • Tasks that involve Mobile UI design

Example prompts

  • “/mobile-principles”

Workflow steps

3 steps, taken from the step headings in SKILL.md.

  1. Hover as the only reveal
  2. Sub-minimum touch targets
  3. Ignoring safe area insets

What it can do on your machine

Read from SKILL.md and the folder at commit 1f518a7. 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, kotlin, css and html).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • w3.org
    • uxmatters.com
    • developer.apple.com
    • m3.material.io

    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

Mobile Principles loads about 2.8k tokens when it runs, and up to ~6.5k if it reads all its reference files. Until then it costs about 46 tokens; SKILL.md has 836 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~2.8k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~6.5k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 836 words (~2,824 tokens).

“Rule of thumb: any tap target smaller than the platform minimum is a usability bug, period. The hit area can extend beyond the visible glyph (use padding, hitSlop, or a transparent inner spacer), but the interactive surface must reach the…”

— opening of SKILL.md by AThevon, Custom licence
name
mobile-principles
metadata.internal
true

Read the full SKILL.md on GitHub

Files

SKILL.md and 2 other files (references) in skills/_jutsu/mobile-principles of AThevon/genjutsu.

  • SKILL.md
  • references/accessibility-mobile.md
  • references/gestures-deep.md

Open the folder on GitHubat commit 1f518a7

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in AThevon/genjutsu, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Mobile Principles 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.

Mobile Principles compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Mobile Principles this skillAThevon/genjutsu4241 repos~2.8kAutomated safety check: PassCustom licence
Mobile AccessibilityCommunity-Access/accessibility-agents422—~1.1kAutomated safety check: PassMIT
Kb Mobile AccessibilityCommunity-Access/accessibility-agents422—~3.8kAutomated safety check: PassMIT
App Store Screenshots GeneratorParthJadhav/app-store-screenshots7.2k—~14kAutomated safety check: PassMIT
Accessible Mobile DeveloperFerroxLabs/wayland608—~3.6kAutomated safety check: PassApache-2.0
Building Native UICherryHQ/cherry-studio-app4k8 repos~2.6kAutomated safety check: PassMIT

Similar skills

  • Mobile Accessibility

    Community-Access/accessibility-agents

    React Native, Expo, iOS and Android: labels, roles and touch targets.

    422 GitHub stars~1.1k tokensUpdated 14 days ago
    MobileAuto-check passed

  • Kb Mobile Accessibility

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    Reference data, not a reviewer. An agent skill from Community-Access/accessibility-agents.

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    7.2k GitHub stars~14k tokensUpdated today
    MobileAuto-check passed

  • Accessible Mobile Developer

    FerroxLabs/wayland

    Mobile accessibility development expertise covering iOS VoiceOver and Android TalkBack integration, accessibility APIs for SwiftUI and Jetpack Compose, touch target sizing, gesture alternatives…

    608 GitHub stars~3.6k tokensUpdated 2 days ago
    MobileAuto-check passed

  • Building Native UI

    CherryHQ/cherry-studio-app

    Complete guide for building beautiful apps with Expo Router.

    4k GitHub starsUsed in 8 repos~2.6k tokens
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  • Phoneagent

    rounak/PhoneAgent

    Control a connected iPhone, iOS simulator, Android emulator, or Android device from macOS through PhoneAgent's JSON-RPC bridge.

    798 GitHub stars~2.2k tokensUpdated 1 mo ago
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Works with

Categories

Questions about Mobile Principles

What does Mobile Principles do?

Mobile-specific UX principles - touch targets, hover-less doctrine, thumb zones, safe areas, gestures, mobile perf budgets. Mobile Principles is an agent skill from AThevon/genjutsu. Mobile-specific UX principles - touch targets, hover-less doctrine, thumb zones, safe areas, gestures, mobile perf budgets.

When should I use Mobile Principles?

Mobile Principles fits situations like: tasks that involve Mobile UI design.

How do I install Mobile Principles in Claude Code?

Run `npx skills add AThevon/genjutsu --skill mobile-principles -a claude-code`. Or copy the skill folder (skills/_jutsu/mobile-principles in AThevon/genjutsu) into .claude/skills/mobile-principles in your project. Claude Code loads it when a task matches its description.

How do I install Mobile Principles in Codex?

Run `npx skills add AThevon/genjutsu --skill mobile-principles -a codex`. Or copy the skill folder (skills/_jutsu/mobile-principles in AThevon/genjutsu) into .agents/skills/mobile-principles in your project. Codex loads it when a task matches its description.

Can I use Mobile Principles 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 AThevon/genjutsu --skill mobile-principles -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mobile-principles, .gemini/skills/mobile-principles, .github/skills/mobile-principles and .opencode/skills/mobile-principles in your project.

What does Mobile Principles need to run?

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

Does Mobile Principles access the network?

SKILL.md names 4 domains. As links in the text: w3.org, uxmatters.com, developer.apple.com and m3.material.io. This is read from the text; nothing was executed.

Is Mobile Principles 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 Mobile Principles use?

Mobile Principles has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Mobile Principles use?

About 2.8k tokens (SKILL.md is roughly 11k 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 3.6k tokens, read only when the agent opens those files.

What are the alternatives to Mobile Principles?

Skills that share tags, products or a category with Mobile Principles: Mobile Accessibility (Community-Access/accessibility-agents, 422 stars), Kb Mobile Accessibility (Community-Access/accessibility-agents, 422 stars), App Store Screenshots Generator (ParthJadhav/app-store-screenshots, 7.2k stars) and Accessible Mobile Developer (FerroxLabs/wayland, 608 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Mobile Principles?

AThevon (a GitHub user) maintains it in AThevon/genjutsu, which has 424 GitHub stars. The repository holds 20 skills in this directory. The repository was last updated on October 5, 2026.

Source: AThevon/genjutsu on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.