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
- Repository
- jeremylongshore/tons-of-skills-marketplace
- 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
- 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.
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.
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
- Grid systems - Mathematical layout structure
- Typography - Clear hierarchy, readable fonts
- Whitespace - Intentional, functional negative space
- Objectivity - Content-focused, minimal decoration
- 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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