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Mobile First Design

Checked
aj-geddes·vlatest·frontend·MIT

Helps with mobile development, design as part of building frontend UIs and user experiences workflows.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add aj-geddes/useful-ai-prompts --skill mobile-first-design -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

aj-geddes

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned aj-geddes/useful-ai-prompts at 3f5182cfd7.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
3f5182cfd7
Manifest
skills/mobile-first-design/SKILL.md
Scanned
6 files, 307 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

The mobile-first design skill instructs AI agents to prioritize building responsive interfaces that start with small screens and scale up for larger displays. It ensures layouts adapt fluidly across devices while maintaining performance and accessibility standards.

When to use it

  • Creating new landing pages or marketing sites intended for broad device consumption.
  • Refactoring existing desktop-heavy codebases to ensure compatibility on tablets and smartphones.
  • Generating CSS media queries and flexbox/grid layouts that prevent horizontal scrolling.
  • Optimizing touch targets and navigation menus for finger interaction rather than mouse clicks.

Key capabilities

  • Generates responsive breakpoints for common screen sizes (mobile, tablet, desktop).
  • Produces mobile-optimized navigation patterns like hamburger menus.
  • Ensures font sizes and spacing remain legible on small displays.
  • Prioritizes core content visibility before expanding secondary features.

Example prompts

  • "Build a responsive hero section using CSS Grid that stacks vertically on mobile devices."
  • "Refactor this desktop-only HTML structure to be fully mobile-first with touch-friendly buttons."
  • "Create a media query strategy for an e-commerce product page to ensure images scale correctly on phones."

Tips & gotchas

Mobile-first design requires testing actual device dimensions rather than relying solely on browser developer tools. Avoid using fixed pixel widths in your base styles; instead, use relative units like rem or percentages to maintain flexibility as screen sizes change.