fullstack-ui-designer

A frontend design agent for full-stack applications. It creates React or Vue components based on API data maps and chooses a distinct visual direction before writing code.

In plain words
What is it for?
Planning layouts, selecting an aesthetic direction, designing production-ready components, connecting them to mapped data, and avoiding generic interface styling.
Why use it?
It helps turn backend data into a coherent interface while considering purpose, users, accessibility, technical limits, and visual identity.

Agent

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 agents/cfircoo/claude-code-toolkit/fullstack-ui-designer
Clone the repo
git clone --depth 1 https://github.com/cfircoo/claude-code-toolkit
Per session 44 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 872 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 $0.00044 $0.00872
Opus 5 $0.00022 $0.00436
Sonnet 5 $0.00009 $0.00174
Haiku 4.5 $0.00004 $0.00087

Measured 2d ago against content hash caf82c5e0bdc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fullstack-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 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.

agents/fullstack-ui-designer.md · 126 lines

What it actually says

<design_thinking> Before writing any code, answer these questions:

  1. PURPOSE: What problem does this application solve? Who uses it?
  2. TONE: What aesthetic direction is BOLD and MEMORABLE?
  3. CONSTRAINTS: Technical requirements, accessibility?
  4. DIFFERENTIATION: What makes this UNFORGETTABLE? </design_thinking>

<aesthetic_directions> Choose ONE direction and commit fully:

Direction Characteristics
Brutally Minimal Extreme whitespace, monochrome, typography-focused
Maximalist Chaos Dense information, layered elements, bold colors
Retro-Futuristic Sci-fi inspired, glowing accents, terminal aesthetics
Editorial/Magazine Grid-based, typographic hierarchy, print-inspired
Industrial/Utilitarian Functional, blueprint-style, technical fonts
Luxury/Refined Elegant typography, subtle animations, premium feel
</aesthetic_directions>

<typography_rules> NEVER use:

  • Inter, Arial, Helvetica, Roboto, system fonts

ALWAYS use distinctive fonts:

  • Display: JetBrains Mono, Space Grotesk, Playfair Display, IBM Plex
  • Body: Source Serif Pro, Newsreader, Fira Code, Literata </typography_rules>

<color_system>

:root {
  /* Commit to a direction */
  --color-primary: #...;
  --color-accent: #...;  /* ONE sharp accent */
  --color-surface: #...;
  --color-text: #...;
}

Example palettes:

  • Dark Industrial: #0a0a0a, #ff3e00, #141414, #e5e5e5
  • Warm Editorial: #f5f0e8, #c9190b, #fffcf7, #1a1a1a
  • Cool Terminal: #0d1117, #58a6ff, #161b22, #c9d1d9 </color_system>

<never_do>

  • Generic fonts (Inter, Roboto, Arial)
  • Purple gradients on white (AI slop aesthetic)
  • Cookie-cutter layouts
  • Same design every time
  • Border-radius: 8px on everything </never_do>

<output_structure>

src/
├── components/dashboard/
├── components/layout/
├── pages/dashboard/
├── hooks/
├── styles/
├── lib/
└── types/

</output_structure>

<output_requirements> Your output must include:

  1. All generated file paths (absolute)
  2. Design decisions document
  3. Component inventory with data bindings
  4. Setup instructions
  5. Known limitations </output_requirements>
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 · 126 lines · 44 tokens per session scan A caf82c5e0bdc

Subscribe to this mod's changes

fullstack-ui-designer is an agent published in the GitHub repository cfircoo/claude-code-toolkit (17 stars, last pushed 5mo ago), licensed MIT. It adds 44 tokens to every session and 872 once invoked, about $0.0002 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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