Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add AThevon/genjutsu --skill castgit clone --depth 1 https://github.com/AThevon/genjutsuWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/athevon/genjutsu/cast)<a href="https://agentmods.dev/skills/athevon/genjutsu/cast"><img src="https://agentmods.dev/badge/skills/athevon/genjutsu/cast/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/athevon/genjutsu/cast"><img src="https://agentmods.dev/badge/skills/athevon/genjutsu/cast.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00059 | $0.11802 |
| Opus 5.5 | $0.00024 | $0.04721 |
| Sonnet 5.5 | $0.00012 | $0.02360 |
| Haiku 4.5 | $0.00006 | $0.01180 |
Grade C, and why
cast scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 23d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
SKILL_BASE="$(find "$HOME/.claude/plugins/cache" -maxdepth 6 -type d -path '*/genjutsu/[0-9]*/skills/_jutsu' 2>/dev/null | sort -V -r | genjutsu_first_jutsu)" Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
|| [ -n "$(find /sessions -maxdepth 6 -type d -path '*/.claude/skills' 2>/dev/null | head -1)" ]; then Copies of this mod
1 near-identical copy found in the catalogue:
- cast — 100% identical
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 23d ago Changed · +22 lines 8c5e760d930f
- 28d ago Changed · +61 lines deb9d48b5d4f
- 29d ago Changed · +148 lines d06d05eff5a0
- 1mo ago Changed · +50 lines f6bed52c5690
- 1mo ago First seen · 479 lines · 59 tokens per session scan C d8379ae158b0
cast is a skill published in the GitHub repository AThevon/genjutsu (694 stars, last pushed 22d ago), with no licence file. It adds 59 tokens to every session and 11,802 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it C with 2 findings (reads agent configuration directories, enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
design-dna
Extract, define, and apply design DNA across three dimensions: design system (tokens), design style (qualitative feel), and visual effects (Canvas, WebGL, 3D, particles, shaders, scroll effects, etc.). Use this skill when: (1) a user wants to see the full 3-dimension design structure/schema, (2) a user provides…
component-family-consistency
Buttons, inputs, badges and pills share radius, colour logic, shadow, border and spacing. Use when building or reviewing a component library.
extract-design
Extract colours, typography, spacing, components and W3C design tokens from a live website with Dembrandt. Use when you need a site's real tokens or want to seed a design system from it.
modular-scale-typography
Ratio-based type scale where every size relates to the others. Use when defining font sizes or type tokens, or when typography feels arbitrary.
data-display-and-selection
View modes, row selection, mass actions, sorting, filters, search and table patterns. Use when designing data tables, listings, file browsers or any collection.
information-architecture
Naming, navigation, a UI that mirrors the data model, confirms for irreversible changes. Use when structuring a large application or naming its entities.