Guide · Agent skill
How to use the Nested Container Frames agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The nested-container-frames skill teaches an AI agent a specific web layout technique: an outer centered container with thin vertical boundary lines and corner markers, with inner blocks inset from its edges, each having its own background, border and rounded corners. This guide is for readers who have not used agent skills before. By the end you will know what the skill changes, how to install it, how to ask for a page that uses it, and where it is a poor fit.
Nested Container FramesMengTo/Skills · MIT Download the skill Quick start
- 1Download the ZIP. Get the nested-container-frames ZIP from this page and unzip it.
- 2Place the folder. Move the skill folder to ~/.claude/skills/ for personal use, or to .claude/skills/ inside a project.
- 3Or upload it in the apps. In the Claude apps, go to Settings → Capabilities → Skills and upload the skill.
- 4Describe the page. Ask for a page with an outer centered container, inset framed inner blocks, and visible boundary lines.
- 5Reference the demo. Optionally point the agent to demo/index.html and use the prompt in demo/PROMPT.md to match a specific look.
- 6Review the result. Check readability, frame line weight and responsive behaviour, and test accessibility yourself.
What the skill makes the agent do
Without the skill, an agent building a landing page usually produces a plain stack of sections or a set of separate cards. This skill changes the structure. The agent defines one outer centered container that sets the page width, adds visible vertical boundary lines and small corner markers to frame it, and then places inner containers inset from those edges using consistent padding.
Each inner level gets its own background, border, radius and spacing. The hero, features, proof and call-to-action sections are separated by these layered frames rather than by heavy stacked cards.
- Outer container: controls the global page width and bounds.
- Boundary lines and corner markers: make the frame visible.
- Inner containers: inset with padding, each with background, border and rounded corners.
- Guardrails: avoid nesting cards inside cards, and keep frame lines from overpowering text.
Install the skill from the ZIP
Download the ZIP for this skill from this page and unzip it. The skill folder contains SKILL.md, which holds the instructions the agent reads, plus a demo folder with demo/index.html, demo/PROMPT.md and demo/source.json.
For a personal install, place the unzipped skill folder in ~/.claude/skills/. For a single project, place it in that project's .claude/skills/ folder. Alternatively, upload the skill in the Claude apps under Settings → Capabilities → Skills.
- Personal: ~/.claude/skills/nested-container-frames/
- Project: .claude/skills/nested-container-frames/ inside your project
- Claude apps: Settings → Capabilities → Skills, then upload
Trigger the skill with a natural request
You do not need special syntax. Describe the page you want and mention the framed, bordered or container-in-container style. The demo prompt in the package starts with $nested-container-frames, which names the skill explicitly, so using that name in your request is a reliable way to make sure it is used.
The skill's own use case is a layout with visible outer bounds, inset inner frames and layered page structure. Ask for that kind of result in plain words.
- Use $nested-container-frames to build a responsive landing page with an outer framed container and inset feature blocks.
- Build a marketing page with visible vertical boundary lines and corner markers, with hero, features, proof and CTA separated by layered frames.
- Create a standalone HTML page in a technical, grid-like bordered style using nested container frames.
Use the included demo as a reference
The package includes a demo built around the concept "Squish — Turn Your Ideas Into Stunning Visuals". demo/PROMPT.md contains two prompts: a minimal prompt asking for a responsive standalone HTML design, and a longer prompt asking the agent to recreate the demo as a complete responsive HTML document, treating demo/index.html as the visual and interaction reference.
Use the longer prompt when you want the agent to match a specific look. Use the minimal prompt when you only want the general technique.
- demo/index.html: the reference page.
- demo/PROMPT.md: the two example prompts.
- demo/source.json: supporting data for the demo.
What the skill needs and safety notes
The skill lists no requirements. According to its listing, it does not run scripts and does not use the network. It is a set of written instructions for layout, so it does not install software or fetch data on your machine.
The skill covers visual styling only. It says nothing about accessibility checks, so if your page must meet accessibility standards, you need to test the output yourself.
- Requires: nothing listed.
- Runs scripts: no.
- Uses network: no.
- Accessibility: not covered; test the output yourself.
Tips for better results
Tell the agent what you do not want. The skill's guardrails already discourage boxing content in too many cards, but a request such as keep frame lines light helps keep text readable.
If your project has an established design system that must be followed exactly, say so. This technique may conflict with it, and the agent should know that before it starts.
- Name the sections you need (hero, features, proof, CTA) so the agent maps them to frame levels.
- Keep frame lines thin and secondary to text.
- Check the result on mobile widths, since the demo prompt asks for a responsive design but the skill itself does not describe testing.
What people use it for
- A developer building a marketing landing page with a bordered, grid-like look.
- A designer prototyping a technical or editorial layout to hand off to a front-end developer.
- Creating a standalone responsive HTML page where hero, features, proof and CTA are separated by layered frames.
- Producing a visual-first atmospheric hero section that uses inset framed levels.
Frequently asked questions
Is the nested container frames skill free?
The skill is licensed under MIT, as stated in its listing. Check the license file in the downloaded package for the full terms.
What do I need to use nested-container-frames?
The skill lists no requirements. It does not run scripts and does not use the network, so you only need an agent environment that supports skills, such as the Claude apps or Claude Code.
Where do I put the skill folder?
Use ~/.claude/skills/ for a personal install, or .claude/skills/ inside a project. You can also upload it in the Claude apps under Settings → Capabilities → Skills.
Does the skill make pages accessible?
No. The skill covers visual styling only and says nothing about accessibility checks, so test contrast, keyboard use and screen reader behaviour yourself.
Can I use it with an existing design system?
Be careful. This technique may conflict with an established design system that must be followed exactly, so it is best suited to projects without strict styling rules.
When should I pick a different approach?
Choose a plain layout for simple pages or apps where extra visual structure is not needed, since the skill adds framing that may not suit the project.
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Our verdict
Use this skill if you want a structured, framed, grid-like landing page or prototype and you are happy to check accessibility and design-system fit yourself. Skip it for simple pages, strict design systems, or projects that need accessibility-tested output out of the box.
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