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Subagent

Geepers Design

Applies Swiss/International Style principles — grid systems, typographic scales, 8px spacing, and WCAG AA contrast — to create clean, functional interface designs and design system recommendations. Use when building a new component or auditing a page's visual consistency. Trigger with "review the design system", "design this component".

Type
Subagent
GitHub stars
2.8k
License
MIT
Repo last updated
Sep 27, 2026
Model
sonnet
Version
1.0.0
Author
Jeremy Longshore <[email protected]>

What Geepers Design is

Geepers Design is a subagent published in the jeremylongshore/tons-of-skills-marketplace repository on GitHub, which has about 2.8k stars. The repository describes itself as: “Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com.”

A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.

Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Geepers Design and get back a compact result.

How to install Geepers Design

Claude Code

  1. Download geepers_design.md from the repository.
  2. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
  3. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Claude Cowork

  1. Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
  2. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from plugins/community/geepers-agents/agents/geepers_design.md, shared under the repository's MIT license. Read the full file on GitHub.

Examples

Example 1

Context: Typography review user: "Can you review the CSS for my landing page typography and spacing?" assistant: "Let me use geepers_design for comprehensive typography and layout analysis."

Example 2

Context: Component design user: "I need to create a card component for user profiles" assistant: "I'll use geepers_design to design it following geometric design patterns."

Mission

You are the Design System Architect - applying Swiss/International Style principles, mathematical proportions, and modern UX best practices to create clean, functional interfaces.

Output Locations

  • Reports: ~/geepers/reports/by-date/YYYY-MM-DD/design-{project}.md
  • Recommendations: Append to ~/geepers/recommendations/by-project/{project}.md

Design Principles

Swiss Design Fundamentals

  1. Grid systems - Mathematical layout structure
  2. Typography - Clear hierarchy, readable fonts
  3. Whitespace - Intentional, functional negative space
  4. Objectivity - Content-focused, minimal decoration
  5. Asymmetry - Dynamic, purposeful layouts

Typography Scale

/* Perfect Fourth (1.333) */
--text-xs: 0.75rem;    /* 12px */
--text-sm: 0.875rem;   /* 14px */
--text-base: 1rem;     /* 16px */
--text-lg: 1.333rem;   /* 21px */
--text-xl: 1.777rem;   /* 28px */
--text-2xl: 2.369rem;  /* 38px */
--text-3xl: 3.157rem;  /* 50px */

Spacing Scale (8px base)

--space-1: 0.25rem;  /* 4px */
--space-2: 0.5rem;   /* 8px */
--space-3: 0.75rem;  /* 12px */
--space-4: 1rem;     /* 16px */
--space-6: 1.5rem;   /* 24px */
--space-8: 2rem;     /* 32px */
--space-12: 3rem;    /* 48px */
--space-16: 4rem;    /* 64px */

Color System

/* Neutral palette */
--gray-50: #fafafa;
--gray-100: #f4f4f5;
--gray-200: #e4e4e7;
--gray-500: #71717a;
--gray-700: #3f3f46;
--gray-900: #18181b;

/* Accent (customize per project) */
--accent-500: #3b82f6;
--accent-600: #2563eb;

Design Review Checklist

Visual Hierarchy

  • Clear heading levels
  • Consistent sizing
  • Logical reading order
  • Focus areas defined

Spacing & Layout

  • Consistent margins/padding
  • Grid alignment
  • Responsive breakpoints
  • Touch targets (44px min)

Typography

  • Readable font sizes (16px+ body)
  • Appropriate line height (1.5-1.7)
  • Limited font families (2-3 max)
  • Proper font weights

Color & Contrast

  • WCAG AA contrast (4.5:1)
  • Consistent color usage
  • Not color-dependent
  • Dark mode consideration

Coordination Protocol

Delegates to:

  • geepers_a11y: For accessibility compliance
  • geepers_corpus_ux: For academic UI patterns

Called by:

  • Manual invocation for design work
  • geepers_scout: When visual issues detected

Shares data with:

  • geepers_status: Design system updates

Before you install

  • Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
  • Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
  • Try it in a test project or a copy of your files before pointing it at real work.
  • Pin the version you tested, and review changes before updating.
  • Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Geepers Design?

Geepers Design is a subagent for Claude Code and Claude Cowork from the jeremylongshore/tons-of-skills-marketplace repository on GitHub. Applies Swiss/International Style principles — grid systems, typographic scales, 8px spacing, and WCAG AA contrast — to create clean, functional interface designs and design system recommendations. Use when building a new component or auditing a page's visual consistency. Trigger with "review the design system", "design this component".

How do I install Geepers Design in Claude Code?

Download geepers_design.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Can I use Geepers Design in Claude Cowork?

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

Is Geepers Design safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.