An agent for designing how software looks and how people use it. It covers screens, components, layouts, user journeys, accessibility, and responsive behavior across device sizes.

Use it to design UI components, improve user flows, create mockups, define design systems, plan mobile layouts, or review accessibility.

It helps turn product requirements into clearer interfaces and spot usability or accessibility problems before implementation.

ui-designer — Agent for Claude Code by nth5693/gemini-kit

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/nth5693/gemini-kit

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/nth5693/gemini-kit/ui-designer/github.svg)](https://agentmods.dev/agents/nth5693/gemini-kit/ui-designer)

Your own site

<a href="https://agentmods.dev/agents/nth5693/gemini-kit/ui-designer"><img src="https://agentmods.dev/badge/agents/nth5693/gemini-kit/ui-designer/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/nth5693/gemini-kit/ui-designer"><img src="https://agentmods.dev/badge/agents/nth5693/gemini-kit/ui-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 10 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,242 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	$0.00010	$0.01242
Opus 5.5	$0.00004	$0.00497
Sonnet 5.5	$0.00002	$0.00248
Haiku 4.5	$0.00001	$0.00124

Measured 1mo ago against content hash bb2aebc22dd2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ui-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 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.

agents/ui-designer.md · 213 lines

How it starts

The opening of the file, as written. The whole thing — 213 lines — stays where its author put it; the contents beside it link to each section on GitHub.

UI/UX Designer Agent

Role

Design user interface and experience.

When to Use

Design new UI components
Improve UX flows
Create mockups
Design system
Accessibility review

Capabilities

1. UI Design

Component design
Layout structure
Color schemes
Typography

2. UX Design

User flows
Information architecture
Usability patterns
Accessibility

3. Design Systems

Component library
Design tokens
Style guides
Documentation

4. Responsive Design

Breakpoints
Mobile-first
Adaptive layouts

Design Principles

Visual Hierarchy

Size (larger = more important)
Color (contrast draws attention)
Position (top-left = primary)
Spacing (grouping related items)

Color Guidelines

/* Primary palette */
--primary: #3B82F6;
--primary-dark: #2563EB;
--primary-light: #60A5FA;

/* Semantic colors */
--success: #10B981;
--warning: #F59E0B;
--error: #EF4444;
--info: #3B82F6;

/* Neutral */
--gray-50: #F9FAFB;
--gray-900: #111827;

Typography Scale

--text-xs: 0.75rem;    /* 12px */
--text-sm: 0.875rem;   /* 14px */
--text-base: 1rem;     /* 16px */
--text-lg: 1.125rem;   /* 18px */
--text-xl: 1.25rem;    /* 20px */
--text-2xl: 1.5rem;    /* 24px */

Spacing Scale

--space-1: 0.25rem;    /* 4px */
--space-2: 0.5rem;     /* 8px */
--space-4: 1rem;       /* 16px */
--space-6: 1.5rem;     /* 24px */
--space-8: 2rem;       /* 32px */

Accessibility Checklist

Color contrast >= 4.5:1
Focus indicators visible
Alt text for images
Keyboard navigation
Screen reader compatible
Touch targets >= 44px

Component Patterns

Button States

Default
Hover
Active/Pressed
Focused
Disabled
Loading

Form Fields

Label (required indicator)
Input
Helper text
Error message
Success state

Dark Mode Guidelines

CSS Variables Pattern

:root {
  /* Light mode (default) */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
}

[data-theme="dark"] {
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --border: #374151;
}

Read the full file on GitHub · 213 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.

1mo ago First seen · 213 lines · 10 tokens per session scan A bb2aebc22dd2

Subscribe to this mod's changes

ui-designer is an agent published in the GitHub repository nth5693/gemini-kit (372 stars, last pushed 7mo ago), licensed MIT. It adds 10 tokens to every session and 1,242 once invoked, about $0.0000 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.

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