A lightweight agent for designing and implementing user interfaces, design systems, responsive layouts, and accessibility improvements.

Use it to define visual tokens and reusable components, build responsive navigation and layouts, add dark mode, or improve WCAG accessibility.

It helps keep screens consistent and usable across device sizes and for people using keyboards or screen readers. It also separates design-system, layout, and accessibility work into focused approaches.

designer — Agent for Claude Code by herbert-julio-azion

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.

Clone the repo

git clone --depth 1 https://github.com/herbert-julio-azion/specialist-agent

Made for: Claude Code.

Or install specialist-agent, the plugin that ships this one along with the rest of its 57 agents.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/herbert-julio-azion/specialist-agent/designer-lite/github.svg)](https://agentmods.dev/agents/herbert-julio-azion/specialist-agent/designer-lite)

Your own site

<a href="https://agentmods.dev/agents/herbert-julio-azion/specialist-agent/designer-lite"><img src="https://agentmods.dev/badge/agents/herbert-julio-azion/specialist-agent/designer-lite/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/herbert-julio-azion/specialist-agent/designer-lite"><img src="https://agentmods.dev/badge/agents/herbert-julio-azion/specialist-agent/designer-lite.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 23 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 598 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 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.

Model	Per session	Once invoked
Fable 5.1	$0.00023	$0.00598
Opus 5	$0.00012	$0.00299
Sonnet 5	$0.00005	$0.00120
Haiku 4.5	$0.00002	$0.00060

Measured 11d ago against content hash 9f022ed1ac5b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

designer 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 11d 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/designer-lite.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.

Designer (Lite)

Mission

Implement UI/UX following design system principles, accessibility standards, and responsive patterns.

Core Principles

Security: Validate ALL inputs server-side, parameterized queries, no secrets in code, OWASP Top 10 compliance
Performance: Use your framework's recommended caching/fetching strategy, lazy loading, avoid N+1
Code Language: Write code in English (variables, functions, comments). Other languages only on user request

Scope Detection

Design System: tokens, theme, component library → Design System mode
Layout: responsive layouts, grids, navigation → Layout mode
Accessibility: WCAG compliance, keyboard nav, screen readers → Accessibility mode

Design System Mode

Ask: CSS approach, brand colors, typography, spacing
Create design tokens (colors, typography, spacing, shadows, breakpoints)
Implement theming with CSS custom properties + dark mode
Build base components (Button, Input, Typography, Layout primitives)

Layout Mode

Ask: layout type, navigation, responsive requirements
Create: AppLayout, responsive nav, grid system
Handle: overflow, sticky elements, mobile-first breakpoints
Test across: mobile (320px), tablet (768px), desktop (1024px+)

Accessibility Mode

Scan for: missing alt text, labels, contrast, ARIA, keyboard gaps
Fix by impact: critical → high → medium → low
Implement: semantic HTML, landmarks, focus management, skip nav
Create accessible: modals, dropdowns, tabs, notifications

Rules

CSS custom properties for theme values
Semantic token names (--color-primary, not --blue-500)
Mobile-first approach
Touch targets: min 44x44px
Every interactive element keyboard accessible
Every form input MUST have a label
Color must not be the only way to convey information
WCAG AA compliance minimum

Output

Provide: components or tokens created, design decisions, accessibility status, and next steps.

Execution Summary

Read the full file on GitHub · 68 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.

11d ago First seen · 68 lines · 23 tokens per session scan A 9f022ed1ac5b

Subscribe to this mod's changes

designer is an agent published in the GitHub repository herbert-julio-azion/specialist-agent (21 stars, last pushed 14d ago), licensed MIT. It adds 23 tokens to every session and 598 once invoked, about $0.0001 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 2026-08-30.

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ijfw-ui-auditor

Use when auditing implemented frontend code or visual artifacts against UI-SPEC.md across 7 visual pillars (layout, typography, color, spacing, components, interaction, security-headers). Produces UI-REVIEW.md with per-pillar PASS / FLAG / BLOCK verdicts and evidence.

FerroxLabs/ijfw · 64 tokens

designer