Guide · Agent skill
How to use the CSS Grid Layout Checker agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The css-grid skill is a checklist-style guide that teaches an AI agent to review your stylesheets and component styles for layouts that use Flexbox, floats, or hacks to control both rows and columns, and to suggest converting them to CSS Grid. It is useful for front-end developers, designers and students who want to know when Grid is the better choice than Flexbox. After reading this guide you will know what the skill does, how to install it from a ZIP or the Claude apps, how to ask for a review in plain language, and what to check before trusting its suggestions.
CSS Grid Layout Checkerthedaviddias/Front-End-Checklist · MIT Download the skill Quick start
- 1Download the skill. Download the css-grid ZIP from this page. It contains SKILL.md and references/rule.md.
- 2Unzip into a skills folder. Unzip into ~/.claude/skills/ for personal use, or into your project's .claude/skills/ folder for one project.
- 3Or upload in the Claude apps. In the Claude apps, open Settings, go to Capabilities, then Skills, and upload the skill.
- 4Ask for a layout review. Name the stylesheet or component and describe the layout problem in plain language.
- 5Check across breakpoints. Ask the agent to review responsive behavior and interaction states, then verify the rendered layout yourself.
- 6Apply and test. Apply the suggested Grid changes one at a time and confirm each in the browser.
What does the css-grid skill make the agent do?
Agent skills are instruction packages that an AI agent loads when a request matches the skill's description. This one covers one web best practice: use CSS Grid for two-dimensional layouts, meaning layouts where you control both rows and columns at once.
When installed, the agent looks for float-based or Flexbox layouts that are trying to control both rows and columns. It can suggest converting them to CSS Grid using grid-template-columns, grid-template-rows and grid-template-areas. It can also explain Grid basics such as tracks, cells, areas, fr units, minmax(), and auto-fill versus auto-fit, and check how layouts behave across breakpoints and interaction states.
- Reviews stylesheets, component styles and responsive behavior
- Flags exact selectors, declarations or breakpoints that conflict with the rule in the rendered UI
- Explains Grid fundamentals and suggests responsive grids that need no media queries
How do you install the css-grid skill?
Download the ZIP of the skill from this page. The skill folder contains SKILL.md and references/rule.md. To install it for yourself across projects, unzip it into your personal skills folder at ~/.claude/skills/. To install it for a single project, unzip it into that project's .claude/skills/ folder.
You can also upload the skill in the Claude apps. Open Settings, go to Capabilities, then Skills, and upload the skill there.
- Personal install: ~/.claude/skills/
- Project install: .claude/skills/ inside your project
- Claude apps: Settings → Capabilities → Skills
How do you trigger the skill with a natural request?
You do not need a special command. The skill's description tells the agent to use it when you review stylesheets, component styles or responsive behavior related to CSS Grid. Mention your stylesheet and the layout problem in plain words, and ask the agent to check the layout across breakpoints if that matters to you.
Good requests name the file or component and the symptom. Vague requests get vague answers.
- "Review styles/card.css. Are any of these Flexbox or float layouts controlling both rows and columns? Suggest Grid where it fits."
- "Check the product grid in ProductList.module.css across mobile and desktop breakpoints before we change anything."
- "Explain the difference between auto-fill and auto-fit for my card grid."
What does a Grid conversion look like?
The skill's reference page gives a simple three-column card grid, and a responsive version that needs no media queries. The second version creates as many columns of at least 280px as fit the container, and the columns stretch to fill the space. The skill's reference notes that this is automatically responsive.
.card-grid {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
gap: 1.5rem;
}What does the skill need, and what are its safety limits?
The skill lists no required tools or packages. It does not run scripts and does not use the network, so it only reads the files and text you give the agent and reasons about them. Because it does not run code, it cannot measure the rendered page for you. Any check of the rendered layout across breakpoints has to be done by you or by the agent using tools you have already provided.
The skill is a guide, so review its suggestions before applying them. It is most useful for layouts that really are two-dimensional. It may suggest unnecessary rewrites for simple one-dimensional layouts where Flexbox is already the right tool.
- Requires: nothing listed
- Runs scripts: no
- Uses network: no
- Not for native mobile apps or projects that do not use CSS
What tips help you get better reviews?
Give the agent the stylesheet and, if you can, a screenshot or description of the rendered layout at each breakpoint. The skill's guidance on Grid basics is most useful when you say which behavior you want, such as cards that wrap or a fixed sidebar with a main area.
Treat the output as a checklist. Confirm each suggested change in the browser, and keep Flexbox where it already handles a single row or column well.
- Name the breakpoints you care about
- Ask for the reason behind each suggested change
- Test changes in the browser at each size before merging
What people use it for
- Converting a float-based card layout to a Grid with grid-template-columns
- Finding Flexbox layouts that are forcing both rows and columns with fixed widths
- Building a responsive card grid with repeat(auto-fill, minmax(280px, 1fr))
- Learning when Grid is a better choice than Flexbox for a page layout
- Reviewing component styles for responsive problems before a release
Frequently asked questions
How do I install the css-grid agent skill?
Download the ZIP from this page and unzip it into ~/.claude/skills/ for personal use, or into a project's .claude/skills/ folder. You can also upload it in the Claude apps under Settings, then Capabilities, then Skills.
Does the css-grid skill require anything else to run?
The skill lists no required tools. It does not run scripts and does not use the network, so it works from the files and text you provide.
Is the css-grid skill free?
The skill is published under the MIT licence. This guide does not state pricing beyond that, so check the source repository for any further terms.
When should I use Flexbox instead of CSS Grid?
Use Flexbox for one-dimensional layouts, where you control a single row or column. Use CSS Grid when you need to control both rows and columns at once, such as page layouts or card grids.
What is the difference between auto-fill and auto-fit?
The skill's guidance covers auto-fill and auto-fit as ways to create responsive grids without media queries. Ask the agent to explain the difference for your specific grid, and check the result in the browser.
Why did the agent suggest a rewrite I did not need?
The skill may suggest unnecessary rewrites for simple one-dimensional layouts where Flexbox already works well. Ask the agent why the change helps, and keep your current code if the benefit is unclear.
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Our verdict
Use this skill if you are cleaning up legacy CSS layouts, learning when Grid beats Flexbox, or running a responsive-layout review before release. Skip it if your project does not use CSS, such as a native mobile app, or if your layouts are simple single rows or columns where Flexbox already fits.
Download the skill