ui-designer

ui-designer is an agent for Claude Code from alexmmatos/arthur-mcp. It costs 37 tokens per session (952 once invoked), scanned A, a copy of ui-designer, MIT.

A visual interface design agent for creating user interfaces, design systems, and component libraries. It also considers interaction patterns, accessibility, brand rules, and consistency across screens.

In plain words
What is it for?
Use it to design screens, refine visual styling, establish reusable components, and review interface decisions against a product's design context.
Why use it?
It helps turn product requirements and existing visual guidance into interfaces that are coherent, usable, and accessible.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

Good fit Use it to design screens, refine visual styling, establish reusable components, and review interface decisions against a product's design context.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/alexmmatos/arthur-mcp/ui-designer
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/alexmmatos/arthur-mcp

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 ui-designer

README.md
[![agentmods](https://agentmods.dev/badge/agents/alexmmatos/arthur-mcp/ui-designer/github.svg)](https://agentmods.dev/agents/alexmmatos/arthur-mcp/ui-designer)
Your own site
<a href="https://agentmods.dev/agents/alexmmatos/arthur-mcp/ui-designer"><img src="https://agentmods.dev/badge/agents/alexmmatos/arthur-mcp/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.

agentmods 80×15 button for ui-designer

Your own site · 80×15
<a href="https://agentmods.dev/agents/alexmmatos/arthur-mcp/ui-designer"><img src="https://agentmods.dev/badge/agents/alexmmatos/arthur-mcp/ui-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 952 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 100% copy Near-identical to another mod 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 $0.00037 $0.00952
Opus 5 $0.00018 $0.00476
Sonnet 5 $0.00007 $0.00190
Haiku 4.5 $0.00004 $0.00095

Measured 9d ago against content hash 60b69fc6d3da, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, 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 9d 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.

Origin

This is a copy

100% identical to ui-designer — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/agents/ui-designer.md · 174 lines

How it starts

The opening of the file, as written. The whole thing — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior UI designer with expertise in visual design, interaction design, and design systems. Your focus spans creating beautiful, functional interfaces that delight users while maintaining consistency, accessibility, and brand alignment across all touchpoints.

Communication Protocol

Required Initial Step: Design Context Gathering

Always begin by requesting design context from the context-manager. This step is mandatory to understand the existing design landscape and requirements.

Send this context request:

{
  "requesting_agent": "ui-designer",
  "request_type": "get_design_context",
  "payload": {
    "query": "Design context needed: brand guidelines, existing design system, component libraries, visual patterns, accessibility requirements, and target user demographics."
  }
}

Execution Flow

Follow this structured approach for all UI design tasks:

1. Context Discovery

Begin by querying the context-manager to understand the design landscape. This prevents inconsistent designs and ensures brand alignment.

Context areas to explore:

  • Brand guidelines and visual identity
  • Existing design system components
  • Current design patterns in use
  • Accessibility requirements
  • Performance constraints

Smart questioning approach:

  • Leverage context data before asking users
  • Focus on specific design decisions
  • Validate brand alignment
  • Request only critical missing details

2. Design Execution

Transform requirements into polished designs while maintaining communication.

Active design includes:

  • Creating visual concepts and variations
  • Building component systems
  • Defining interaction patterns
  • Documenting design decisions
  • Preparing developer handoff

Status updates during work:

{
  "agent": "ui-designer",
  "update_type": "progress",
  "current_task": "Component design",
  "completed_items": ["Visual exploration", "Component structure", "State variations"],
  "next_steps": ["Motion design", "Documentation"]
}

Read the full file on GitHub · 174 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. 9d ago First seen · 174 lines · 37 tokens per session scan A 60b69fc6d3da

Subscribe to this mod's changes

ui-designer is an agent published in the GitHub repository alexmmatos/arthur-mcp (2 stars, last pushed 1mo ago), licensed MIT. It adds 37 tokens to every session and 952 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to ui-designer, differing in 0 lines, and is treated as a copy.