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CRUX: Skill for Claude Code

.agents/skills/web-design-guidelines/SKILL.md

web-design-guidelines is a skill for Claude Code, Codex from JustineDevs/CRUX. It costs 44 tokens per session (268 once invoked), scanned A, original, no licence file.

A review skill for checking web interface code against common interface and accessibility guidelines. Accessibility means making a site usable by people with different abilities and assistive technologies.

In plain words
What is it for?
Reviewing UI code, auditing accessibility and user experience, and checking a website against interface best practices.
Why use it?
It helps reveal usability and accessibility problems that may not be obvious while writing or visually testing the interface.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is JustineDevs/CRUX's own configuration. It tells Claude Code and Codex how to work on CRUX itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything CRUX configures →

not rated 1repo 2mo ago A scan 44 tokens no licence
View source ↗ JustineDevs/CRUX cruxbeta.vercel.app
Reuse

Borrowing it

Nothing to install: this file belongs to JustineDevs/CRUX. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/JustineDevs/CRUX/main/.agents/skills/web-design-guidelines/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/JustineDevs/CRUX

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for web-design-guidelines

README.md
[![agentmods](https://agentmods.dev/badge/skills/justinedevs/crux/web-design-guidelines/github.svg)](https://agentmods.dev/skills/justinedevs/crux/web-design-guidelines)
Your own site
<a href="https://agentmods.dev/skills/justinedevs/crux/web-design-guidelines"><img src="https://agentmods.dev/badge/skills/justinedevs/crux/web-design-guidelines/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.

agentmods 80×15 button for web-design-guidelines

Your own site · 80×15
<a href="https://agentmods.dev/skills/justinedevs/crux/web-design-guidelines"><img src="https://agentmods.dev/badge/skills/justinedevs/crux/web-design-guidelines.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 268 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00044 $0.00268
Opus 5.5 $0.00018 $0.00107
Sonnet 5.5 $0.00009 $0.00054
Haiku 4.5 $0.00004 $0.00027

Measured 2mo ago against content hash 65d7dbaf180a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

web-design-guidelines scanned grade A with 0 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 2mo 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/web-design-guidelines/SKILL.md · 41 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 2mo ago First seen · 41 lines · 44 tokens per session scan A 65d7dbaf180a

Subscribe to this mod's changes

web-design-guidelines is a skill published in the GitHub repository JustineDevs/CRUX (1 stars, last pushed 2mo ago), with no licence file. It adds 44 tokens to every session and 268 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Design and UXFrontendcrux-mcpmcpmcp-servermcp-toolsopenaiopenai-compatible
Related

web-design-guidelines compared with skills from other repositories

web-design-guidelines next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
web-design-guidelinesJustineDevs/CRUXSkill12mo agononeA44Claude Code, Codex
interactive-uisaidsef/mcp-github-pr-issue-analyserSkill62d agoApache-2.0A18Claude Code, Codex
screenshotsxAmirHamza77/ReverseOps-SkillSkill53mo agoMITA52Claude Code, Codex
atelieranshrajore/atelier-mcpSkill02mo agoMITA34Claude Code, Codex
diagram-generatorxAmirHamza77/ReverseOps-SkillSkill53mo agoMITA118Codex
html-artifactslangchain-ai/open-sweSkill11kyesterdayMITA52Claude Code, Codex
visualizevellum-ai/vellum-assistantSkill1.5k2d agoMITA57Claude Code, Codex