frontend-developer

frontend-developer is a skill for Claude Code from Vinix24/vnx-orchestration. It costs 12 tokens per session (481 once invoked), scanned B, original, MIT.

A frontend development skill for building user interfaces: the screens, controls, and interactions people use in an application. It covers structure, accessibility, responsive layouts, browser support, and performance.

In plain words
What is it for?
Use it to create accessible pages and components, responsive navigation, forms, dashboards, and the JavaScript behavior behind them.
Why use it?
It gives coding agents a consistent way to turn interface requirements into usable production code. It also addresses mobile layouts, keyboard and assistive-technology access, and loading speed.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

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.

agentmods
npx agentmods add skills/vinix24/vnx-orchestration/frontend-developer
Any agent
npx skills add Vinix24/vnx-orchestration --skill frontend-developer
Clone the repo
git clone --depth 1 https://github.com/Vinix24/vnx-orchestration

Made for: Claude Code.

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-developer

README.md
[![agentmods](https://agentmods.dev/badge/skills/vinix24/vnx-orchestration/frontend-developer.svg)](https://agentmods.dev/skills/vinix24/vnx-orchestration/frontend-developer)
Your own site
<a href="https://agentmods.dev/skills/vinix24/vnx-orchestration/frontend-developer"><img src="https://agentmods.dev/badge/skills/vinix24/vnx-orchestration/frontend-developer.svg" alt="Measured on agentmods" height="20"></a>
Per session 12 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 481 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
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 $0.00012 $0.00481
Opus 5 $0.00006 $0.00241
Sonnet 5 $0.00002 $0.00096
Haiku 4.5 $0.00001 $0.00048

Measured 6d ago against content hash b3134701daf9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade B, and why

frontend-developer scanned grade B with 1 finding 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 6d 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.

Asks the agent to reveal its instructionsmediumSystem prompt leakage

Directions to print, repeat or translate the system prompt extract configuration the operator did not intend to expose.

## Output Instructions
.claude/skills/frontend-developer/SKILL.md · 81 lines

How it starts

The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Frontend Developer

Create distinctive, production-grade interfaces that avoid generic aesthetics.

Core Responsibilities

  • Create semantic HTML structure
  • Apply accessible ARIA attributes
  • Implement responsive CSS with modern features
  • Add progressive enhancement JavaScript
  • Test across browsers and devices
  • Optimize performance

Design Philosophy

Before coding, commit to a BOLD aesthetic direction:

  • Purpose: What problem does this solve? Who uses it?
  • Tone: Pick distinctive style (brutalist, minimal, retro-futuristic, organic)
  • Differentiation: What makes this UNFORGETTABLE?

Examples

  • "Build dashboard with real-time metrics"
  • "Create accessible form components"
  • "Implement mobile-first navigation"

Guidelines

Implementation Standards

  • Typography: Use distinctive fonts, avoid generic (Arial, Inter)
  • Color: Cohesive palette with CSS variables
  • Motion: Subtle animations for micro-interactions
  • Layout: Mobile-first responsive design
  • Performance: Bundle <500KB, LCP <2.5s

Quality Requirements

  • WCAG 2.1 AA compliance minimum
  • Lighthouse score >90
  • Cross-browser compatibility
  • Touch-friendly interactions
  • Keyboard navigation complete

Workflow

  1. Analyze design requirements
  2. Create component structure
  3. Style with distinctive aesthetics
  4. Add interactivity progressively
  5. Optimize performance
  6. Test accessibility

Constraints

  • PR includes component + tests
  • Follow existing design system
  • Document component API
  • Include usage examples
  • Mobile-first approach

Output Instructions

For report generation, see: @.claude/skills/frontend-developer/template.md

Intelligence Queries

For accessing proven patterns and solutions, see: @.claude/skills/frontend-developer/scripts/intelligence.sh


Skill Activation Announcement

MANDATORY — first line of every response after skill load:

Skill actief: frontend-developer

No exceptions. This must appear before any other content.

Read the full file on GitHub · 81 lines

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. 6d ago First seen · 81 lines · 12 tokens per session scan B b3134701daf9

Subscribe to this mod's changes

frontend-developer is a skill published in the GitHub repository Vinix24/vnx-orchestration (57 stars, last pushed today), licensed MIT. It adds 12 tokens to every session and 481 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (asks the agent to reveal its instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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