frontend

frontend is a skill for Claude Code from romiluz13/cc10x. It costs 63 tokens per session (1,912 once invoked), scanned A, original, MIT.

A frontend development guide with an authoring mode for building user interfaces and a read-only critique mode for reviewing them against set criteria.

In plain words
What is it for?
Use it to plan visual direction, create or update DESIGN.md files, handle loading and error states, improve responsive layouts and performance, or score an existing interface.
Why use it?
It helps avoid inaccessible, poorly adapted, slow, or generic-looking interfaces, and makes review findings more consistent.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the cc10x plugin — 22 skills, 14 agents, 10 hooks shipped together

Good fit Use it to plan visual direction, create or update DESIGN.md files, handle loading and error states, improve responsive layouts and performance, or score an existing interface.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/romiluz13/cc10x/frontend
Install

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.

Any agent
npx skills add romiluz13/cc10x --skill frontend
Clone the repo
git clone --depth 1 https://github.com/romiluz13/cc10x

Made for: Claude Code.

Or install cc10x, the plugin that ships this one along with the rest of its 22 skills, 14 agents, 10 hooks.

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 frontend

README.md
[![agentmods](https://agentmods.dev/badge/skills/romiluz13/cc10x/frontend/github.svg)](https://agentmods.dev/skills/romiluz13/cc10x/frontend)
Your own site
<a href="https://agentmods.dev/skills/romiluz13/cc10x/frontend"><img src="https://agentmods.dev/badge/skills/romiluz13/cc10x/frontend/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 frontend

Your own site · 80×15
<a href="https://agentmods.dev/skills/romiluz13/cc10x/frontend"><img src="https://agentmods.dev/badge/skills/romiluz13/cc10x/frontend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 63 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,912 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium MCP Rug Pull · line 153
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
How audits are shown
Origin original 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 $0.00063 $0.01912
Opus 5.5 $0.00025 $0.00765
Sonnet 5.5 $0.00013 $0.00382
Haiku 4.5 $0.00006 $0.00191

Measured 1mo ago against content hash b0a7e20c52f3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

frontend 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 1mo 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.

plugins/cc10x/skills/frontend/SKILL.md · 158 lines

How it starts

The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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 fonts Reflex-reject aesthetic lanes
Inter, Roboto, Arial, system-ui defaults Purple/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" pick Warm-beige + serif "anti-AI" editorial (reflex #2)
Generic Google-Fonts pairing of the month Glassmorphism 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.

Read the full file on GitHub · 158 lines

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 1mo ago First seen · 158 lines · 63 tokens per session scan A b0a7e20c52f3

Subscribe to this mod's changes

frontend is a skill published in the GitHub repository romiluz13/cc10x (165 stars, last pushed 12d ago), licensed MIT. It adds 63 tokens to every session and 1,912 once invoked, about $0.0003 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 2026-08-30.