Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill mobile-first-design- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads mobile-first-design automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Mobile-First Design
Table of Contents
Overview
Mobile-first design prioritizes small screens as the starting point, ensuring core functionality works on all devices while leveraging larger screens for enhanced experience.
When to Use
- Web application design
- Responsive website creation
- Feature prioritization
- Performance optimization
- Progressive enhancement
- Cross-device experience design
Quick Start
Minimal working example:
Mobile-First Approach:
Step 1: Design for Mobile (320px - 480px)
- Constrained space forces priorities
- Focus on essential content and actions
- Single column layout
- Touch-friendly interactive elements
Step 2: Enhance for Tablet (768px - 1024px)
- Add secondary content
- Multi-column layouts possible
- Optimize spacing and readability
- Take advantage of hover states
Step 3: Optimize for Desktop (1200px+)
- Full-featured experience
- Advanced layouts
- Rich interactions
- Multiple columns and sidebars
---
## Responsive Breakpoints:
Mobile: 320px - 480px
- iPhone SE, older phones
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Responsive Design Implementation | Responsive Design Implementation |
| Mobile Performance | Mobile Performance |
| Progressive Enhancement | Progressive Enhancement |
Best Practices
✅ DO
- Design for smallest screen first
- Test on real mobile devices
- Use responsive images
- Optimize for mobile performance
- Make touch targets 44x44px minimum
- Stack content vertically on mobile
- Use hamburger menu on mobile
- Hide non-essential content on mobile
- Test with slow networks
- Progressive enhancement approach
❌ DON'T
- Assume all mobile users have fast networks
- Use desktop-only patterns on mobile
- Ignore touch interaction needs
- Make buttons too small
- Forget about landscape orientation
- Over-complicate mobile layout
- Ignore mobile performance
- Assume no keyboard (iPad users)
- Skip mobile user testing
- Forget about notches and safe areas
FAQ
What does the mobile-first-design skill do?
Design for mobile devices first, then scale up to larger screens. Create responsive interfaces that work seamlessly across all device sizes.
How do I install mobile-first-design?
Run npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill mobile-first-design in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/mobile-first-design/ (personal) or .claude/skills/mobile-first-design/ (project).
Which AI agents can use mobile-first-design?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is mobile-first-design safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains mobile-first-design?
It is published by aj-geddes in aj-geddes/useful-ai-prompts. It has 857 recorded installs.
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