frontend-design

A guide for designing and implementing distinctive, responsive web interfaces with a consistent visual system, accessible behavior, and checks across screen sizes. It covers both new interfaces and major visual changes to existing ones.

In plain words
What is it for?
Use it to build or substantially redesign websites and front-end product screens, including their responsive layouts, interactions, motion, and visual verification.
Why use it?
It helps turn a product's audience and main task into clear layout, typography, color, interaction, and accessibility decisions instead of assembling unrelated interface parts.

Skill for Claude CodeCodex

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

Made for: Claude Code, Codex.

Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 546 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00062 $0.00546
Opus 5 $0.00031 $0.00273
Sonnet 5 $0.00012 $0.00109
Haiku 4.5 $0.00006 $0.00055

Measured 2d ago against content hash 7ac22882172f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

frontend-design 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 2d 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.

app/agent/builtin_skills/frontend-design/SKILL.md · 68 lines

How it starts

The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Design and build a frontend

Make the interface specific to its subject, audience, and primary job. Preserve existing product conventions when editing an established application; novelty must not break usability or brand coherence.

State machine

1. FRAME

Identify the primary user, page or flow job, content hierarchy, required states, platform constraints, existing design system, and supplied visual direction. Choose non-blocking details from context. Ask only when missing assets, brand rules, or incompatible interpretations would materially change the result.

2. DIRECT

Write a compact design contract before implementation:

  • 4–6 color tokens with semantic roles;
  • display, body, and utility type roles;
  • layout/grid behavior across desktop and mobile;
  • interaction and motion principles;
  • one subject-specific signature element;
  • accessibility requirements and reduced-motion behavior.

Reject choices that could be reused unchanged for any product. Structural devices, imagery, copy, and motion must communicate something true about the subject. Spend visual boldness in one place and keep surrounding elements disciplined.

3. BUILD

Use repository-native components, tokens, routing, state, and dependencies. Implement real content and all relevant loading, empty, error, disabled, hover, focus, and success states. Keep control labels action-oriented and consistent through the flow. Avoid decorative grids, gradients, cards, numbering, and animation unless they serve the hierarchy or interaction.

Preserve semantic HTML, keyboard navigation, visible focus, contrast, target sizes, responsive reflow, and reduced motion. Check CSS specificity and avoid local rules that silently cancel shared component behavior.

4. VERIFY

Run the repository's narrow checks, then inspect the rendered interface at representative desktop and mobile sizes. Exercise keyboard navigation and the main interaction path. Compare the render with the design contract and correct generic styling, clipping, overflow, unreadable density, broken states, and unnecessary decoration.

Read the full file on GitHub · 68 lines

Files

What ships with it

3 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. 2d ago First seen · 68 lines · 62 tokens per session scan A 7ac22882172f

Subscribe to this mod's changes

frontend-design is a skill published in the GitHub repository evoelsewhere/evoflux (5 stars, last pushed 6d ago), licensed Apache-2.0. It adds 62 tokens to every session and 546 once invoked, about $0.0003 per session on Opus 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.

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