Agent skill

Frontend

by romiluz13 in romiluz13/cc10x

Two-mode frontend skill: (1) authoring — accessibility, responsive layout, loading/error states, performance, DESIGN.md authoring, visual direction; (2) critique — READ-only scored review of built…

MITAuto-check: notesFrontend & Design

Install Frontend

skills CLI
$ npx skills add romiluz13/cc10x --skill frontend -a claude-code

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

GitHub CLI
$ gh skill install romiluz13/cc10x frontend --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/romiluz13/cc10x.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/cc10x/skills/frontend .claude/skills/frontend && 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
frontend
GitHub stars
164
Token cost
~2k tokens
SKILL.md length
928 words
Files
6 (incl. references)
Skills in repo
22
Repo updated
First seen
Licence
MIT

At a glance

Two-mode frontend skill: (1) authoring — accessibility, responsive layout, loading/error states, performance, DESIGN.md authoring, visual direction; (2) critique — READ-only scored review of built…

  • Works in 2 steps: First-order: Could you guess the… → Second-order: Could you guess it from…
  • Tasks that involve Quizzes and assessments
  • SKILL.md covers Reference Files, Shared Visual Direction Rules, Mode: AUTHORING and Mode: CRITIQUE
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Frontend is an agent skill from romiluz13/cc10x. Two-mode frontend skill: (1) authoring — accessibility, responsive layout, loading/error states, performance, DESIGN.md authoring, visual direction; (2) critique — READ-only scored review of built UI against anchored rubric, AI-slop detection, two isolated assessments. Router invokes mode via context.

Its SKILL.md is about 2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `references/accessibility-and-forms.md`, `references/design-md-authoring.md` and `references/design-md-inspiration-index.md`).

It sits in Frontend & Design, covering Quizzes and assessments, Design tokens and Responsive design. The repository describes itself as: The Loop Engine for Claude Code — engineer the loop, not the prompt. 1 router · 9 agents · 16 skills · 4 workflows. Fail-closed gates, test honesty, anti-anchored review. The licence is MIT.

When your agent uses it

  • Tasks that involve Quizzes and assessments
  • Tasks that involve Design tokens
  • Tasks that involve Responsive design

Example prompts

  • “/frontend”

Requirements

  • Node.js
  • Pre-approved tools (allowed-tools): Read, Grep, Glob, Bash, LSP

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

  1. First-order: Could you guess the theme/palette from the category alone? ("Fintech → blue + sans-serif.") If yes → generic. Reject.
  2. Second-order: Could you guess it from category + anti-references? Once everyone "avoids the purple gradient," the avoidance becomes a…

What it can do on your machine

Read from SKILL.md and the folder at commit f346ebe. 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:

    • Read
    • Grep
    • Glob
    • Bash
    • LSP

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    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

Frontend loads about 2k tokens when it runs, and up to ~5.4k if it reads all its reference files. Until then it costs about 78 tokens; SKILL.md has 928 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~78
When it runs · the whole SKILL.md, loaded when a task matches
~2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~5.4k

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: 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: Read, Grep, Glob, Bash, LSP

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

The full file from romiluz13/cc10x at commit f346ebe, republished under its MIT licence (© romiluz13). 928 words, ~2,027 tokens.

Download SKILL.mdSave it as .claude/skills/frontend/SKILL.md (or your agent's skills folder). This skill also uses 5 other files; get the full folder from GitHub.
name
frontend
description
Two-mode frontend skill: (1) authoring — accessibility, responsive layout, loading/error states, performance, DESIGN.md authoring, visual direction; (2) critique — READ-only scored review of built UI against anchored rubric, AI-slop detection, two isolated assessments. Router invokes mode via context.
allowed-tools
Read, Grep, Glob, Bash, LSP
user-invocable
false

Frontend (Authoring + Critique)

Two modes: authoring (build UI with patterns) and critique (score built UI). Both share the visual-direction rules below.

Reference Files

Read only what's needed:

  • references/ui-state-and-feedback.md — loading/error/empty/success ordering, skeleton vs spinner
  • references/accessibility-and-forms.md — WCAG, keyboard/focus, labels, form patterns, mobile
  • references/performance-and-layout.md — responsive, motion, overflow, URL state, light/dark mode
  • references/design-md-authoring.md — creating/updating DESIGN.md from screenshots, existing UI, preferences
  • references/design-md-inspiration-index.md — style references when user asks for direction

Shared Visual Direction Rules

Two-Altitude Reflex Check

Before committing a visual direction, run both tests:

  1. First-order: Could you guess the theme/palette from the category alone? ("Fintech → blue + sans-serif.") If yes → generic. Reject.
  2. Second-order: Could you guess it from category + anti-references? Once everyone "avoids the purple gradient," the avoidance becomes a reflex — fintech dodging blue lands on the same off-black + lime. If predictable given what people flee toward → still generic. Reject.

The cure: derive direction from the specific product, audience, and content — not from the category or what the category is fleeing.

Reflex-Reject Lists (maintained, pruned as families saturate)
Reflex-reject fontsReflex-reject aesthetic lanes
Inter, Roboto, Arial, system-ui defaultsPurple/violet gradient on white (AI-tool reflex #1)
Geist / Geist Mono (over-saturated)Off-black + acid-lime "anti-corporate" (reflex #2)
Space Grotesk as default "modern" pickWarm-beige + serif "anti-AI" editorial (reflex #2)
Generic Google-Fonts pairing of the monthGlassmorphism cards on gradient mesh

Prune a lane out once it stops being a reflex; add new families as they saturate. A stale blocklist becomes its own reflex.

Anti-patterns Blocklist
Anti-patternFix
user-scalable=no, maximum-scale=1Remove — blocks accessibility zoom
transition: allList properties explicitly
outline-none without replacementAdd focus-visible:ring-*
<div onClick>Use <button> or <a>
Images without width/heightAdd dimensions (prevents CLS)
Form inputs without labelsAdd <label> or aria-label
Icon buttons without aria-labelAdd aria-label
Emoji as UI icons (🚀 ✨)Use SVG icons (Heroicons, Lucide)
Hardcoded date/number formatsUse Intl.DateTimeFormat
autoFocus everywhereUse sparingly, desktop only
Motion Rules

Animate transform/opacity only — never width/height/top/left. No layout-shifting hover effects. List transition properties explicitly. 150-300ms for micro-interactions. Honor prefers-reduced-motion. Allow animation cancellation — motion must not block user action.


Mode: AUTHORING

Design for user success, not aesthetic preference. Map user flow before writing UI. State order: Error → Loading (no data) → Empty → Success.

Mock-Fidelity Inventory (No Silent Loss)

A build can pass every test and still quietly omit the hero or signature motif. Once a design/mock is approved, before coding, INVENTORY its major visible ingredients:

IngredientImplementation path
Hero / focal momentBuild now / phase 2 (explicit) / cut (approved)
Signature motifsBuild now / approximate / cut (approved)
SectionsBuild now / phase 2 (explicit) / cut (approved)
InteractionsBuild now / static fallback / cut (approved)
States (empty/loading/error)Build now (states are not optional)

Every ingredient gets exactly one path. "Cut" and "phase 2" are legitimate, but only when explicitly named — never reached by omission. Treat any silently-dropped major ingredient as a P0 fidelity defect.

Design-System Drift Classifier

When a feature deviates from the design system, classify the root cause:

Root causeFix
Missing token — system has no value for this needAdd the token to the system, then use it
One-off impl — token/component exists, but feature reimplemented locallySwap to shared component/token; delete the one-off
Conceptual misalignment — feature's interaction model fights the system'sRework the flow — patching pixels won't fix it

Flow-shape match: a feature's flow shape must match its neighbors. Modal vs full-page, save-on-blur vs explicit submit — inconsistency reads as broken even when every pixel is on-system. Treat unexplained flow-shape mismatch as conceptual-misalignment.


Show full SKILL.md (367 more words)Show less

Mode: CRITIQUE

READ-only. Scores and flags; caller decides what to fix. A design self-graded by the head that built it is not reviewed — it is rationalized.

Two Isolated Assessments + Synthesis

Assessment A — design-director qualitative review. Read the UI as a senior design director would: hierarchy, rhythm, restraint, intentionality. Score the rubric. A forms its opinion WITHOUT running the ban-list scan.

Assessment B — AI-slop / pattern scan. SEPARATE pass walking the ban-list. B must NOT see A's conclusions — give it the artifact, not A's writeup.

Synthesis — reconcile only after both commit. Where A and B independently agree → high confidence. Where B caught what A's eye glossed → keep it. Where B's match is a false positive → drop with one-line reason.

If only one head: run B first (mechanical, no narrative), record it, THEN run A — never the reverse. A's narrative contaminates B; B's list barely colors A.

Anchored 0-4 Rubric

Heuristics: visual hierarchy, visual rhythm & spacing, restraint & intentionality, consistency & system fit, feedback & state legibility, distinctiveness.

ScoreCriteria
0Broken or actively confusing
1Works but generic and fragile. Template defaults, AI-slop tells
2Solid, competent, unremarkable. Most real interfaces live here
3Good. Intentional hierarchy, consistent system, distinctive
4Genuinely excellent. Every element earns its place. Rare
Band (avg)ActionSeverity
0Do not shipP0
1Rework before shipP1
2Ship with noted follow-upsP2
3-4ShipP3 (polish only)

Most real interfaces score 2; anti-grade-inflation is the job.

AI-Slop Ban-List
Slop patternDefault verdict
Side-stripe / left-accent-border cardsRefuse
Gradient text headingsRefuse
Glassmorphism by defaultRefuse
Hero-metric template (stat row)Refuse
Identical card grids (no hierarchy)Refuse
Modal as first-thought containerRefuse
Cream + serif + terracotta "editorial" paletteRefuse
Black + acid-lime/green accentRefuse

A ban-list match is a finding, not an automatic 0 — let synthesis decide severity against A's read.

Optional Deterministic Detector

If an npx slop-detector is configured/available, run it in Assessment B. If not, the ban-list scan runs by hand. Never block on a missing tool, never invent a tool call.

RTL / Hebrew-Aware Notes

When UI is RTL: check mirroring correctness (layout, icon direction, progress/flow), logical properties (margin-inline-start over hard-coded left/right), mixed-direction runs (Latin tokens in RTL text), and typography (missing intentional Hebrew face = distinctiveness gap).

© romiluz13, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 5 other files (references) in plugins/cc10x/skills/frontend of romiluz13/cc10x.

  • SKILL.md
  • references/accessibility-and-forms.md
  • references/design-md-authoring.md
  • references/design-md-inspiration-index.md
  • references/performance-and-layout.md
  • references/ui-state-and-feedback.md

Open the folder on GitHubat commit f346ebe

Compare with similar skills

Frontend 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.

Frontend compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Frontend this skillromiluz13/cc10x164—~2kAutomated safety check: NotesMIT
Material Design 3 UI/UX Guideskydashnet/material-design-3-ui-skill130—~3kAutomated safety check: PassMIT
UI Design Systemtry-works/role-model118—~5kAutomated safety check: PassMIT
Design Handoff Specgetcrew44/crew44356—~680Automated safety check: PassMIT
OpenClaw Design Auditopenclaw/clawhub9.5k—~498Automated safety check: PassMIT
Bmad UXaj-geddes/claude-code-bmad-skills487—~2kAutomated safety check: NotesCustom licence

Similar skills

  • Material Design 3 UI/UX Guide

    skydashnet/material-design-3-ui-skill

    Guides designing, reviewing or implementing interfaces that follow Google's Material Design 3 system: semantic tokens, component states, adaptive layout and accessibility.

    130 GitHub stars~3k tokensUpdated 7 days ago
    Frontend & DesignAuto-check passed
  • UI Design System

    try-works/role-model

    React UI component systems with TailwindCSS + Radix + shadcn/ui.

    118 GitHub stars~5k tokensUpdated today
    Frontend & DesignAuto-check passed
  • Design Handoff Spec

    getcrew44/crew44

    Produces an implementation-ready spec from a finished design, covering layout, tokens, states, responsive behavior, edge cases, motion and accessibility, so engineers do not have to guess.

    356 GitHub stars~680 tokensUpdated 3 mo ago
    Frontend & DesignAuto-check passed
  • OpenClaw Design Audit

    openclaw/clawhub

    Audits OpenClaw frontend code and rendered pages for token misuse, reimplemented primitives, accessibility and responsive defects and off-brand copy, with an evidence-based report.

    9.5k GitHub stars~498 tokensUpdated today
    Frontend & DesignAuto-check passed
  • Bmad UX

    aj-geddes/claude-code-bmad-skills

    Solutioning-phase UX planning skill (optional; activate when the project has a UI).

    487 GitHub stars~2k tokensUpdated 3 mo ago
    Frontend & DesignAuto-check: notes
  • Design Auditor

    borghei/Claude-Skills

    Audit UI/UX designs for quality, AI-generated slop, and accessibility.

    881 GitHub stars~1.4k tokensUpdated yesterday
    Frontend & DesignAuto-check passed

More from romiluz13/cc10x

All 22 skills in this repo
  • Building

    romiluz13/cc10x

    A skill your agent uses when writing production code test-first: the RED-GREEN-REFACTOR cycle, false-RED detection, vertical slicing, scope escalation, test process discipline, and code generation…

    164 GitHub stars~2.7k tokensUpdated today
    Auto-check: notes
  • Diff Driven Docs

    romiluz13/cc10x

    A skill your agent uses when a BUILD phase completes, a commit is staged, or a PR is about to be created, and the diff has not yet been reflected in documentation.

    164 GitHub stars~2.7k tokensUpdated today
    Auto-check: notes
  • Planning

    romiluz13/cc10x

    A skill your agent uses when writing an execution plan or a decision RFC: task decomposition, context references, validation levels, risk-based testing, ADR format, plan completeness gate, and…

    164 GitHub stars~2.1k tokensUpdated today
    Auto-check passed
  • Verification

    romiluz13/cc10x

    A skill your agent uses when judging whether a task reached its goal, not just finished: the gate function, self-critique gate, validation levels, evidence array protocol, and goal-backward lens.

    164 GitHub stars~1.9k tokensUpdated today
    Auto-check: notes
  • Agent Common

    romiluz13/cc10x

    A skill your agent uses when a cc10x agent starts a task: the shared preamble for the memory protocol, the contract format, and the output rules.

    164 GitHub stars~2k tokensUpdated today
    Auto-check passed
  • Cc10x Guide

    romiluz13/cc10x

    Answers questions about cc10x itself — what it is, how to install and configure it, how the router, workflows, memory, and hooks operate, and how to troubleshoot.

    164 GitHub stars~2.2k tokensUpdated today
    Auto-check passed

Questions about Frontend

What does Frontend do?

Two-mode frontend skill: (1) authoring — accessibility, responsive layout, loading/error states, performance, DESIGN.md authoring, visual direction; (2) critique — READ-only scored review of built…. Frontend is an agent skill from romiluz13/cc10x.md authoring, visual direction; (2) critique — READ-only scored review of built UI against anchored rubric, AI-slop detection, two isolated assessments.

When should I use Frontend?

Frontend fits situations like: tasks that involve Quizzes and assessments; tasks that involve Design tokens; tasks that involve Responsive design.

How do I install Frontend in Claude Code?

Run `npx skills add romiluz13/cc10x --skill frontend -a claude-code`. Or copy the skill folder (plugins/cc10x/skills/frontend in romiluz13/cc10x) into .claude/skills/frontend in your project. Claude Code loads it when a task matches its description.

How do I install Frontend in Codex?

Run `npx skills add romiluz13/cc10x --skill frontend -a codex`. Or copy the skill folder (plugins/cc10x/skills/frontend in romiluz13/cc10x) into .agents/skills/frontend in your project. Codex loads it when a task matches its description.

Can I use Frontend 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 romiluz13/cc10x --skill frontend -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/frontend, .gemini/skills/frontend, .github/skills/frontend and .opencode/skills/frontend in your project.

What does Frontend need to run?

SKILL.md names no scripts, command-line tools or credentials: Frontend is instructions for the agent only. Our summary lists: Node.js. Its frontmatter pre-approves these tools: Read, Grep, Glob, Bash, LSP.

Does Frontend 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 Frontend 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 Frontend use?

Frontend is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Frontend use?

About 2k tokens (SKILL.md is roughly 8.1k 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 3.4k tokens, read only when the agent opens those files.

What are the alternatives to Frontend?

Skills that share tags, products or a category with Frontend: Material Design 3 UI/UX Guide (skydashnet/material-design-3-ui-skill, 130 stars), UI Design System (try-works/role-model, 118 stars), Design Handoff Spec (getcrew44/crew44, 356 stars) and OpenClaw Design Audit (openclaw/clawhub, 9.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Frontend?

romiluz13 (a GitHub user) maintains it in romiluz13/cc10x, which has 164 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 7, 2026.

Source: romiluz13/cc10x on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.