Agent skill

Cast

Cast genjutsu on a UI - creative coding for motion, micro-interactions, and wow-factor.

Custom licenceAuto-check: notesFrontend & Design

Install Cast

skills CLI

$ npx skills add AThevon/genjutsu --skill cast -a claude-code

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

GitHub CLI

$ gh skill install AThevon/genjutsu cast --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/cast .claude/skills/cast && 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/

Paste into Claude Code

Install the "cast" agent skill from https://github.com/AThevon/genjutsu/tree/main/skills/cast into .claude/skills/cast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cast", 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

$skill-installer install https://github.com/AThevon/genjutsu/tree/main/skills/cast

Type 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.

skills CLI

$ npx skills add AThevon/genjutsu --skill cast -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install AThevon/genjutsu cast --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AThevon/genjutsu.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/cast .agents/skills/cast && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "cast" agent skill from https://github.com/AThevon/genjutsu/tree/main/skills/cast into .agents/skills/cast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cast", 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.

skills CLI

$ npx skills add AThevon/genjutsu --skill cast -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install AThevon/genjutsu cast --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AThevon/genjutsu.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/cast .cursor/skills/cast && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "cast" agent skill from https://github.com/AThevon/genjutsu/tree/main/skills/cast into .cursor/skills/cast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cast", 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

$ gemini skills install https://github.com/AThevon/genjutsu.git --path skills/cast

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add AThevon/genjutsu --skill cast -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install AThevon/genjutsu cast --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AThevon/genjutsu.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/cast .gemini/skills/cast && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "cast" agent skill from https://github.com/AThevon/genjutsu/tree/main/skills/cast into .gemini/skills/cast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cast", 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.

GitHub CLI

$ gh skill install AThevon/genjutsu cast

Installs 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).

skills CLI

$ npx skills add AThevon/genjutsu --skill cast -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/AThevon/genjutsu.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/cast .github/skills/cast && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "cast" agent skill from https://github.com/AThevon/genjutsu/tree/main/skills/cast into .github/skills/cast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cast", 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.

skills CLI

$ npx skills add AThevon/genjutsu --skill cast -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install AThevon/genjutsu cast --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AThevon/genjutsu.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/cast .opencode/skills/cast && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "cast" agent skill from https://github.com/AThevon/genjutsu/tree/main/skills/cast into .opencode/skills/cast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cast", 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: cast
GitHub stars: 424
Used in: 1 other repo
Token cost: ~11k tokens
SKILL.md length: 5,297 words
Files: 1
Skills in repo: 20
Repo updated: Oct 5, 2026
First seen: Oct 7, 2026
Licence: Custom licence

At a glance

Cast genjutsu on a UI - creative coding for motion, micro-interactions, and wow-factor.

Works in 7 steps: SCAN - Detect the stack → DISCOVER - Understand the intent (when… → SCOPE - Evaluate the request → …
Tasks that involve Web animation and motion
SKILL.md covers Voice, Iron Rules, Showing Your Work - The… and When nobody is answering, plus 3 more sections
Calls python3 and git; reaches genjutsu.athevon.dev

What it does

Cast is an agent skill from AThevon/genjutsu. Cast genjutsu on a UI - creative coding for motion, micro-interactions, and wow-factor. Scans the stack, proposes an interaction thesis, loads the right sub-skills, implements the illusion. Adapts to Web, Android (Compose), Apple (SwiftUI).

Its SKILL.md is about 11k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering Web animation and motion, Essays and academic help and Generative and creative coding. It works with SwiftUI, Android and GSAP. 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 Web animation and motion
Tasks that involve Essays and academic help
Tasks that involve Generative and creative coding

Example prompts

“/cast”

Requirements

Pre-approved tools (allowed-tools): Bash, Read, Edit, Write, Grep, Glob, WebSearch, Artifact

Workflow steps

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

SCAN - Detect the stack
DISCOVER - Understand the intent (when needed)
SCOPE - Evaluate the request
THESIS - One sentence before coding
LOAD - Load the relevant sub-skills
IMPLEMENT - Code while respecting the loaded principles
AUDIT - Verification before delivery

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 these tools, so the agent can use them without asking each time:
- Bash
- Read
- Edit
- Write
- Grep
- Glob
- WebSearch
- Artifact
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- python3
- git
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- genjutsu.athevon.dev
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

Cast loads about 11k tokens when it runs. Until then it costs about 61 tokens; SKILL.md has 5,297 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~61
When it runs · the whole SKILL.md, loaded when a task matches: ~11k

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: Bash, Read, Edit, Write, Grep, Glob, WebSearch, Artifact

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 5,297 words (~11,498 tokens).

“You are a creative coding expert. You cast genjutsu on basic UIs and turn them into something alive. You adapt to the scope and the stack.”

— opening of SKILL.md by AThevon, Custom licence

name: cast
allowed-tools: Bash, Read, Edit, Write, Grep, Glob, WebSearch, Artifact

Outline of SKILL.md

Cast - The Illusionist
Voice
Iron Rules
Showing Your Work - The Preview Gate
When nobody is answering
Pipeline
1. SCAN - Detect the stack
2. DISCOVER - Understand the intent (when needed)
3. SCOPE - Evaluate the request
4. THESIS - One sentence before coding
5. LOAD - Load the relevant sub-skills
6. IMPLEMENT - Code while respecting the loaded principles
7. AUDIT - Verification before delivery
Checked here, with evidence
You must run these - not verified here
Red Flags - You're About to Violate This Skill
Quick decision tree

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/cast of AThevon/genjutsu.

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.

Jwuthri/Tracely-ai.agents/skills/cast

Compare with similar skills

Cast 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.

Cast compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Cast this skillAThevon/genjutsu	424	1 repos	~11k	Automated safety check: Notes	Custom licence	2 days ago
Awwwards-Level React AnimationsHainrixz/editor-pro-max	261	—	~4.4k	Automated safety check: Pass	Custom licence	6 mo ago
UI Review TahoeKartikLabhshetwar/better-shot	2.4k	2 repos	~1.7k	Automated safety check: Pass	Custom licence	7 days ago
Frontend UI StandardsMaxHan7/frontend-ui-standards-skill	106	—	~2.4k	Automated safety check: Pass	MIT	3 mo ago
Frontend Designavibebuilder/claude-prime	120	—	~2.1k	Automated safety check: Pass	MIT	4 mo ago
macOS Golden Gate Designgithub/awesome-copilot	40k	—	~2.1k	Automated safety check: Pass	MIT	today

Similar skills

Awwwards-Level React Animations
Hainrixz/editor-pro-max
Guides React animation work with GSAP, Motion, Anime.js and Lenis for scroll effects, page transitions, text effects and generative visuals, with a library decision table.
261 GitHub stars~4.4k tokensUpdated 6 mo ago
Frontend & DesignAuto-check passed
UI Review Tahoe
KartikLabhshetwar/better-shot
Comprehensive UI/UX review for macOS Tahoe apps. An agent skill from KartikLabhshetwar/better-shot.
2.4k GitHub starsUsed in 2 repos~1.7k tokens
Frontend & DesignAuto-check passed
Frontend UI Standards
MaxHan7/frontend-ui-standards-skill
A skill your agent uses when implementing, refactoring, or reviewing frontend UI across SwiftUI, React, React Native, Flutter, web, or mobile apps.
106 GitHub stars~2.4k tokensUpdated 3 mo ago
Frontend & DesignAuto-check passed
Frontend Design
avibebuilder/claude-prime
Builds distinctive, production-grade UIs that avoid generic AI aesthetics.
120 GitHub stars~2.1k tokensUpdated 4 mo ago
Frontend & DesignAuto-check passed
macOS Golden Gate Design
github/awesome-copilot
Official
Design, implement, review, or refactor native macOS 27 Golden Gate interfaces in SwiftUI or AppKit.
40k GitHub stars~2.1k tokensUpdated today
Frontend & DesignAuto-check passed
Design System
WrongStack/WrongStack
Use this skill BEFORE writing or restyling ANY user-facing interface.
370 GitHub stars~3.9k tokensUpdated yesterday
Frontend & DesignAuto-check passed

Questions about Cast

What does Cast do?

Cast genjutsu on a UI - creative coding for motion, micro-interactions, and wow-factor. Cast is an agent skill from AThevon/genjutsu. Cast genjutsu on a UI - creative coding for motion, micro-interactions, and wow-factor.

When should I use Cast?

Cast fits situations like: tasks that involve Web animation and motion; tasks that involve Essays and academic help; tasks that involve Generative and creative coding.

How do I install Cast in Claude Code?

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

How do I install Cast in Codex?

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

Can I use Cast 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 cast -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cast, .gemini/skills/cast, .github/skills/cast and .opencode/skills/cast in your project.

What does Cast need to run?

Going by SKILL.md and its folder, Cast needs the command-line tools its instructions call (python3 and git). Its frontmatter pre-approves these tools: Bash, Read, Edit, Write, Grep, Glob, WebSearch, Artifact.

Does Cast access the network?

SKILL.md names 1 domain. In commands or code: genjutsu.athevon.dev; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Cast 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 Cast use?

Cast 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 Cast use?

About 11k tokens (SKILL.md is roughly 46k 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 Cast?

Skills that share tags, products or a category with Cast: Awwwards-Level React Animations (Hainrixz/editor-pro-max, 261 stars), UI Review Tahoe (KartikLabhshetwar/better-shot, 2.4k stars), Frontend UI Standards (MaxHan7/frontend-ui-standards-skill, 106 stars) and Frontend Design (avibebuilder/claude-prime, 120 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cast?

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.

Cast

Install Cast

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Used in 1 other repository

Compare with similar skills

Similar skills

Awwwards-Level React Animations

UI Review Tahoe

Frontend UI Standards

Frontend Design

macOS Golden Gate Design

Design System

More from AThevon/genjutsu

Orchestration

Swiftui Graphics

Design Audit

UI UX Pro Max

Canvas Generative

Compose Motion

Questions about Cast

Install Cast

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Used in 1 other repository

Compare with similar skills

Similar skills

More from AThevon/genjutsu

Related

Questions about Cast