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Agent skill

Motion Principles

by AThevon in AThevon/genjutsu

Motion design foundation - timing, easing, enter/exit patterns, accessibility, performance.

Custom licenceAuto-check passedFrontend & Design

Install Motion Principles

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

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

GitHub CLI
$ gh skill install AThevon/genjutsu motion-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/motion-principles .claude/skills/motion-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
motion-principles
GitHub stars
424
Used in
1 other repo
Token cost
~2.3k tokens
SKILL.md length
559 words
Files
4 (incl. references)
Skills in repo
20
Repo updated
First seen
Licence
Custom licence

At a glance

Motion design foundation - timing, easing, enter/exit patterns, accessibility, performance.

  • Works in 5 steps: Never animate width/height/top/left → Never scale to 0 → Never ease-in on an entry → …
  • Tasks that involve Accessibility
  • SKILL.md covers Timing Rules, Easing Cheat Sheet, Accessibility (Non-Negotiable) and Universal "Do Not" Rules, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Motion Principles is an agent skill from AThevon/genjutsu. Motion design foundation - timing, easing, enter/exit patterns, accessibility, performance.

Its SKILL.md is about 2.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `references/designers.md`, `references/easing-guide.md` and `references/enter-exit-recipes.md`).

It sits in Frontend & Design, covering Accessibility, Motion graphics and Web animation and motion. 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 Accessibility
  • Tasks that involve Motion graphics
  • Tasks that involve Web animation and motion

Example prompts

  • “/motion-principles”

Workflow steps

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

  1. Never animate width/height/top/left
  2. Never scale to 0
  3. Never ease-in on an entry
  4. Never exceed 500ms on a UI interaction
  5. Never skip prefers-reduced-motion

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 css, swift, kotlin and javascript).

    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

Motion Principles loads about 2.3k tokens when it runs, and up to ~8.4k if it reads all its reference files. Until then it costs about 27 tokens; SKILL.md has 559 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~27
When it runs · the whole SKILL.md, loaded when a task matches
~2.3k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~8.4k

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 559 words (~2,276 tokens).

“Frequency rule: The more often an animation plays, the shorter and subtler it must be. A button hover (1000x/day) = 100ms opacity. An onboarding reveal (1x ever) = 600ms+ full choreography.”

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

Read the full SKILL.md on GitHub

Files

SKILL.md and 3 other files (references) in skills/_jutsu/motion-principles of AThevon/genjutsu.

  • SKILL.md
  • references/designers.md
  • references/easing-guide.md
  • references/enter-exit-recipes.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

Motion 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.

Motion Principles compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Motion Principles this skillAThevon/genjutsu4241 repos~2.3kAutomated safety check: PassCustom licence
Oma Designfirst-fluke/oh-my-agent1.3k—~2.9kAutomated safety check: PassMIT
Animation Motion Designyonatangross/orchestkit289—~2kAutomated safety check: PassMIT
Web Animation DesignbaptisteArno/typebot.io11k2 repos~2.7kAutomated safety check: PassCustom licence
Baseline UIibelick/ui-skills9.5k8 repos~855Automated safety check: PassMIT
Motion DesignLottieFiles/motion-design-skill2k1 repos~3.1kAutomated safety check: PassMIT

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  • Oma Design

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Categories

Questions about Motion Principles

What does Motion Principles do?

Motion design foundation - timing, easing, enter/exit patterns, accessibility, performance. Motion Principles is an agent skill from AThevon/genjutsu. Motion design foundation - timing, easing, enter/exit patterns, accessibility, performance.

When should I use Motion Principles?

Motion Principles fits situations like: tasks that involve Accessibility; tasks that involve Motion graphics; tasks that involve Web animation and motion.

How do I install Motion Principles in Claude Code?

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

How do I install Motion Principles in Codex?

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

Can I use Motion 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 motion-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/motion-principles, .gemini/skills/motion-principles, .github/skills/motion-principles and .opencode/skills/motion-principles in your project.

What does Motion Principles need to run?

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

Does Motion Principles 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 Motion 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 Motion Principles use?

Motion 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 Motion Principles use?

About 2.3k tokens (SKILL.md is roughly 9.1k 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 6.1k tokens, read only when the agent opens those files.

What are the alternatives to Motion Principles?

Skills that share tags, products or a category with Motion Principles: Oma Design (first-fluke/oh-my-agent, 1.3k stars), Animation Motion Design (yonatangross/orchestkit, 289 stars), Web Animation Design (baptisteArno/typebot.io, 11k stars) and Baseline UI (ibelick/ui-skills, 9.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Motion 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.