Agent skill

Responsive Images

by thedaviddias in thedaviddias/Front-End-Checklist

A skill your agent uses when reviewing article images, cards, galleries, or any component rendered at multiple sizes across breakpoints.

MITAuto-check passedFrontend & Design

Install Responsive Images

skills CLI
$ npx skills add thedaviddias/Front-End-Checklist --skill responsive-images -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist responsive-images --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/responsive-images .claude/skills/responsive-images && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
responsive-images
GitHub stars
74k
Token cost
~403 tokens
SKILL.md length
149 words
Files
2 (incl. references)
Skills in repo
390
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when reviewing article images, cards, galleries, or any component rendered at multiple sizes across breakpoints.

  • Reviewing article images
  • SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Any component rendered at multiple sizes across breakpoints

What it does

Responsive Images is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing article images, cards, galleries, or any component rendered at multiple sizes across breakpoints. Check both the markup and the CSS layout because an incorrect sizes attribute can negate a perfectly good srcset.

Its SKILL.md is about 400 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).

It sits in Frontend & Design, covering Responsive design. The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.

When your agent uses it

  • Reviewing article images
  • Any component rendered at multiple sizes across breakpoints

Example prompts

  • “/responsive-images”

What it can do on your machine

Read from SKILL.md and the folder at commit e8d14d0. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • frontendchecklist.io

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Responsive Images loads about 403 tokens when it runs, and up to ~1.6k if it reads all its reference files. Until then it costs about 63 tokens; SKILL.md has 149 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~63
When it runs · the whole SKILL.md, loaded when a task matches
~403
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 149 words, ~403 tokens.

Download SKILL.mdSave it as .claude/skills/responsive-images/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
responsive-images
description
Use when reviewing article images, cards, galleries, or any component rendered at multiple sizes across breakpoints. Check both the markup and the CSS layout because an incorrect `sizes` attribute can negate a perfectly good `srcset`.
metadata.category
images
metadata.priority
high
metadata.difficulty
intermediate
metadata.estimatedTime
20
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/images/responsive-images

Implement responsive images with srcset

Serving a 2000px image to a 400px phone screen wastes bandwidth and slows loading—srcset lets the browser download only the size it needs.

Quick Reference

  • Use srcset to provide multiple image sizes
  • Use sizes attribute to tell browser which size to download
  • Browser selects optimal size based on viewport and DPR
  • Can save 50-70% bandwidth on mobile devices

Check

Verify that images use srcset and sizes attributes for responsive delivery.

Fix

Implement responsive images with srcset for different screen sizes and resolutions.

Explain

Explain how responsive images deliver optimized versions based on device capabilities.

Code Review

Inspect image markup and component abstractions for srcset, sizes, and width/height handling. Flag pages that always ship desktop-sized assets to mobile, omit sizes, or generate variants that do not match the actual rendered layout.


For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/rules/images/responsive-images

© thedaviddias, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in skills/responsive-images of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Responsive Images next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Responsive Images compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Responsive Images this skillthedaviddias/Front-End-Checklist74k—~403Automated safety check: PassMIT
UI StylingOhh-889/skyroc79513 repos~2.5kAutomated safety check: PassMIT
Material 3hamen/material-3-skill1.5k2 repos~7.8kAutomated safety check: PassMIT
Trip Map Builderhiyeshu/trip-map-builder244—~1.7kAutomated safety check: PassNone
Antislop Layoutmobilemiqdadbadjuber/anti-slop5.7k—~4.1kAutomated safety check: PassMIT
Local Testinglobehub/lobe-ui2.2k—~2.1kAutomated safety check: PassMIT

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    795 GitHub starsUsed in 13 repos~2.5k tokens
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  • Content Freshness Signals

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Questions about Responsive Images

What does Responsive Images do?

A skill your agent uses when reviewing article images, cards, galleries, or any component rendered at multiple sizes across breakpoints. Responsive Images is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing article images, cards, galleries, or any component rendered at multiple sizes across breakpoints.

When should I use Responsive Images?

Responsive Images fits situations like: reviewing article images; any component rendered at multiple sizes across breakpoints.

How do I install Responsive Images in Claude Code?

Run `npx skills add thedaviddias/Front-End-Checklist --skill responsive-images -a claude-code`. Or copy the skill folder (skills/responsive-images in thedaviddias/Front-End-Checklist) into .claude/skills/responsive-images in your project. Claude Code loads it when a task matches its description.

How do I install Responsive Images in Codex?

Run `npx skills add thedaviddias/Front-End-Checklist --skill responsive-images -a codex`. Or copy the skill folder (skills/responsive-images in thedaviddias/Front-End-Checklist) into .agents/skills/responsive-images in your project. Codex loads it when a task matches its description.

Can I use Responsive Images in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add thedaviddias/Front-End-Checklist --skill responsive-images -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/responsive-images, .gemini/skills/responsive-images, .github/skills/responsive-images and .opencode/skills/responsive-images in your project.

What does Responsive Images need to run?

SKILL.md names no scripts, command-line tools or credentials: Responsive Images is instructions for the agent only.

Does Responsive Images access the network?

SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.

Is Responsive Images safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Responsive Images use?

Responsive Images is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Responsive Images use?

About 403 tokens (SKILL.md is roughly 1.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.2k tokens, read only when the agent opens those files.

What are the alternatives to Responsive Images?

Skills that share tags, products or a category with Responsive Images: UI Styling (Ohh-889/skyroc, 795 stars), Material 3 (hamen/material-3-skill, 1.5k stars), Trip Map Builder (hiyeshu/trip-map-builder, 244 stars) and Antislop Layoutmobile (miqdadbadjuber/anti-slop, 5.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Responsive Images?

thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.

Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.