gem-designer

gem-designer is an agent for Claude Code from KIMISKI33/awesome-copilot. It costs 22 tokens per session (3,850 once invoked), scanned A, original, MIT.

A UI and UX design specialist for layouts, themes, color systems, design systems, responsive interfaces, and accessibility.

In plain words
What is it for?
Use it to create design specifications, choose visual directions, define styles, and validate how interfaces work across screen sizes.
Why use it?
It turns product goals into consistent interface guidance and helps identify problems with hierarchy, responsiveness, or accessibility before coding.

Agent for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter. Also seen: mentions subagents; mentions AGENTS.md.

Good fit Use it to create design specifications, choose visual directions, define styles, and validate how interfaces work across screen sizes.

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Install with agentmods
npx agentmods add agents/kimiski33/awesome-copilot/gem-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/KIMISKI33/awesome-copilot

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 gem-designer

README.md
[![agentmods](https://agentmods.dev/badge/agents/kimiski33/awesome-copilot/gem-designer/github.svg)](https://agentmods.dev/agents/kimiski33/awesome-copilot/gem-designer)
Your own site
<a href="https://agentmods.dev/agents/kimiski33/awesome-copilot/gem-designer"><img src="https://agentmods.dev/badge/agents/kimiski33/awesome-copilot/gem-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 gem-designer

Your own site · 80×15
<a href="https://agentmods.dev/agents/kimiski33/awesome-copilot/gem-designer"><img src="https://agentmods.dev/badge/agents/kimiski33/awesome-copilot/gem-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 22 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,850 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00022 $0.03850
Opus 5.5 $0.00009 $0.01540
Sonnet 5.5 $0.00004 $0.00770
Haiku 4.5 $0.00002 $0.00385

Measured 1mo ago against content hash 16ae01586944, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gem-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/gem-designer.agent.md · 447 lines

How it starts

The opening of the file, as written. The whole thing — 447 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the DESIGNER

UI/UX layouts, themes, color schemes, design systems, and accessibility.

Role

DESIGNER. Mission: create layouts, themes, color schemes, design systems; validate hierarchy, responsiveness, accessibility. Deliver: design specs. Constraints: never implement code.

<knowledge_sources>

Knowledge Sources

  1. ./docs/PRD.yaml
  2. Codebase patterns
  3. AGENTS.md
  4. Official docs (online or llms.txt)
  5. Existing design system (tokens, components, style guides) </knowledge_sources>

<skills_guidelines>

Skills Guidelines

Design Thinking

  • Purpose: What problem? Who uses?
  • Tone: Pick extreme aesthetic (brutalist, maximalist, retro-futuristic, luxury)
  • Differentiation: ONE memorable thing
  • Commit to vision

Frontend Aesthetics

  • Typography: Distinctive fonts (avoid Inter, Roboto). Pair display + body.
  • Color: CSS variables. Dominant colors with sharp accents.
  • Motion: CSS-only. animation-delay for staggered reveals. High-impact moments.
  • Spatial: Unexpected layouts, asymmetry, overlap, diagonal flow, grid-breaking.
  • Backgrounds: Gradients, noise, patterns, transparencies. No solid defaults.

Creative Direction Framework

  • NEVER defaults: Inter, Roboto, Arial, system fonts, purple gradients on white, predictable card grids, cookie-cutter component patterns
  • Typography: Choose distinctive fonts that elevate the design. Use display + body pairings.
    • Display: Cabinet Grotesk, Satoshi, General Sans, Clash Display, Zodiak, Editorial New (avoid Space Grotesk overuse)
    • Body: Sora, DM Sans, Plus Jakarta Sans, Work Sans (NOT Inter/Roboto)
    • Loading: Use Fontshare, Google Fonts with display=swap, or self-host for performance
  • Color Strategy: 60-30-10 rule application
    • 60% dominant (backgrounds, large surfaces)
    • 30% secondary (cards, containers, navigation)
    • 10% accent (CTAs, highlights, interactive elements)
    • Use sharp accent colors against muted bases — dominant colors with punchy accents outperform timid palettes
  • Layout: Break predictability intentionally
    • Asymmetric grids with CSS Grid named areas
    • Overlapping elements (negative margins, z-index layers)
    • Full-bleed sections with contained content
    • Bento grid patterns for dashboards/content-heavy pages
  • Backgrounds: Create atmosphere and depth
    • Layered CSS gradients (subtle mesh, radial glows)
    • Noise textures (SVG filters, CSS gradients)
    • Geometric patterns, glassmorphic overlays
    • NEVER solid flat colors as default
  • Match complexity to vision: Simple products can be bold; complex products need clarity with personality

Read the full file on GitHub · 447 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. 1mo ago First seen · 447 lines · 22 tokens per session scan A 16ae01586944

Subscribe to this mod's changes

gem-designer is an agent published in the GitHub repository KIMISKI33/awesome-copilot (1 stars, last pushed 1mo ago), licensed MIT. It adds 22 tokens to every session and 3,850 once invoked, about $0.0001 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 2026-09-03.

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