Why Claude delivers generic design by default, the 5 skills that fix this in practice, and the step-by-step to build your own when none fit your brand.
You already know how to recognize it. Purple gradient on a white background, Inter font, soft shadow on the card, a lost emoji in the middle of the section. You look at it and think: Claude made this.
It's not the model's fault. It's its default behavior.
When you ask to "build a landing page" without any further instructions, the model won't go after the most interesting choice. It will go after the most probable one. And the most probable choice is the average of everything it saw during training: millions of safe, generic, forgettable pages. The result is design that looks like AI design because it is literally the statistical center of what exists on the web.
Anthropic has a name for this, they call it distributional convergence. In practice, it means one thing: without direction, Claude always falls into the commonplace.
A skill is how you take it out of that place.
What is a skill, quickly
Think of a markdown (text) file that Claude reads before starting to work. Instead of repeating your preferences, your design system, and your tone in every prompt, you write it once and it loads automatically. It's a job description you hand over before passing the task.
The difference in output is huge. Same prompt, same Claude, but with the right skill loaded, it stops being a generic designer and becomes a collaborator who knows your work.
I tested a bunch of them, with before and after on the same prompt to see what really moves the needle. We can separate 5 that really move the pointer for web design.
1. Frontend Design (the official one from Anthropic)
This is the most popular in the ecosystem, and for a good reason: it was released by Anthropic itself. It has passed 277,000 installations.
The secret to it isn't teaching Claude how to draw beautifully; it's teaching it what not to do. The file explicitly lists the clichés to avoid: overused fonts, the usual color schemes, that card shadow structure everyone recognizes. It's a short lesson in good taste embedded in the model.
In the before and after test, this becomes obvious. The same landing page that came out with a purple gradient and emoji turns into something editorial, with elegant serif and clean sans-serif pairing, scroll fade animations, and thoughtful hover states. From just one prompt.
When to use: Whenever you're starting a project from scratch and want to escape the default on the first try. It's your base.
And it doesn't lock you into its style. If you want the rest of the rules but only sans-serif fonts, just edit the markdown and tell it: "only use Geist, Google Sans, or DM Sans." Claude adjusts the file.
2. Impeccable (the toolbox)
Made by Paul Bakaus, this became one of the community's favorites, passing 45.9k stars on GitHub in a short time. And it's easy to see why.
The cool thing about it is the commands. There's the pure /impeccable, but it comes with about 20 subcommands you call depending on the context:
- /impeccable animate adds intro animations and movement cohesively, in a way that makes sense for the page
- /impeccable quieter runs a "noise" audit on the design (too many gradients, heavy font weight on every heading, scattered emojis) and trims the excess, bringing elegance instead of shouting
- /impeccable audit does a quality and accessibility check
- /impeccable document generates a design.md that captures your entire design system for any agent to read later
Underneath, it has 46 deterministic rules for slop detection—those that run without depending on the model guessing. It catches AI-generated patterns precisely.
When to use: To iterate on what you already have. Got a page ready and want to tame the exaggeration? quieter. Lacks life? animate. In two prompts, the site changes level.
Detail that goes beyond the tool: Impeccable has a "slop" tab that shows the patterns it teaches the AI to avoid. Look at this list yourself. Learning to recognize that an accent border on the side of a card has become an AI cliché makes you design better manually too.
3. UIUX Pro Max (the one that forces Claude to think)
This is a design database on steroids, and the most starred on the list: it passed 105k stars on GitHub. There are 67 UI styles, 161 color palettes, 57 font pairs, 99 UX guidelines, and 16 tech stacks so it knows how to implement in each framework.
The point of it isn't to give you code fast; it's the opposite. It forces Claude to reason before writing any line. It runs your layout through a search in five domains in parallel (product, style, color, landing, typography), applies reasoning rules, and only then returns a complete design system, with anti-patterns to avoid already marked.
https://x.com/nett0eth/status/2073490435066982554
The result is intentional sections, not decorative ones. In the test, it did things like a light-to-dark transition right in the KPI block, specifically to highlight the number that needs to jump out. It's the kind of decision you expect from a human, not a generator.
When to use: When you have clarity on the content and want design depth. And a tip worth gold: the more specific you are about what you want in each section, the better. A skill doesn't read your mind; it amplifies your direction. Sending "use the skill and do a more drastic redesign, explore the palettes and font pairs" completely changes what comes back.
4. Web Design Guidelines (the auditor, from Vercel Labs)
This one is for the end of the project, not the beginning. It comes from Vercel Labs, has 29k stars on GitHub, and audits your code against Vercel's list of web interface guidelines, over 100 rules: keyboard focus working, never disabling zoom, not blocking paste, loading indicator on buttons, heading hierarchy, ARIA, and so on.
And it has a trick I like: you can ask Claude to annotate problems directly on the preview screen. Instead of reading a list, you see on the site, in orange, where an aria-label is missing, where keyboard navigation breaks, where the CTA lacks focus. It becomes visual.
When to use: When the design is already good and you want to ensure it's accessible and won't embarrass anyone using a keyboard or screen reader. It's the QA before going live.
5. Astryx (the agent-ready design system, from Meta)
https://x.com/nett0eth/status/2073826299789889884
The fifth is in another category: it's not a taste skill, it's an entire design system. The 4 above teach Claude to design better, one screen at a time. Meta bet on the opposite path and opened Astryx, the design system that grew for 8 years in-house, became the largest and most used in the company, and runs in over 13,000 apps. Now it's open source and, the detail that matters here, agent ready.
The catch is this: instead of hoping the model has common sense for every component, you give it a system where everything is already born accessible and consistent. There are over 150 components, 7 ready-made themes, dark mode, and a CLI that both the person and the agent use the same way, reading the same doc. There's even a CLAUDE.md in the repository for Claude to understand the house before writing the first line.
It runs on React and StyleX, is in beta, and already has 8.2k stars.
When to use: When you want system consistency, not just a pretty screen. Skills refine the model's taste; Astryx ensures the foundation is already solid before any prompt. The two complement each other.
Where to find more skills
These 5 cover about 90% of what a web designer does in Claude. But if you want to explore, there are good directories:
- UI Skills is focused on design engineers but serves for web design too. It lists several of these 4 and has accessibility and Shadcn stuff.
- Type UI is my favorite for those who think visual first. You scroll and see a preview of each aesthetic (minimalist, neo-brutalism, sophisticated corporate) and call the one you want without writing a paragraph of instruction.
- MCP Market is a large community repository; go to Agent Skills > Categories > Design Tools and there's an endless list.
- skills.sh is where Vercel and others publish officially, good for getting it straight from the source.
How to create your own skill
When none of them fit your brand or your stack 100%. That's when you make your own.
In the Claude app or Claude Code, go to Customize > Skills > Create Skill > Create with Claude. It starts by asking you what the skill should do.
The part that separates a useful skill from a useless one is how specific you are here. Instead of "make pretty design," give reasoning rules. For example:
- Always identify the product type first (dashboard, landing, app), because the design changes with context.
- Always infer the screen's goal before drawing: what action matters most and what the user should notice first.
- Default to a contained palette, more neutral background and surface.
- A primary body font and, if needed, a display font for large headings.
Claude starts a conversation and asks about your stack (Tailwind tokens, for example), your spacing proportions, your layout limits. Be detailed; that's what makes the skill worth it. In the end, it packages everything into a .md with reference folders, and you access it via your own slash command.
But creating the skill is the easy part. The hard part is ensuring it doesn't break in the next session, and that's where the axis many people skip comes in. I've already broken down Matt Pocock's 8-step framework for writing skills that sustain themselves (trigger, structure, direction, pruning) in a separate article, and it's worth more than any design skill you install:
https://x.com/nett0eth/status/2075976597513830727
It's worth reading together; it's the same reasoning of "giving the right ruler to the model" applied one layer above. Anthropic's official guide, The Complete Guide to Building Skills for Claude, also breaks down the principles.
What remains
Claude is not an impressive designer by default. This is no news to anyone who has asked for a landing page and received the usual purple gradient.
Skill is how you close this gap. Not because the model got smarter, but because you gave it the ruler that a real designer carries in their head. The model matters less than the loop you build around it.
Configure it once. The jump in output is big enough that you won't want to work without it anymore.
The question remains: how many of your projects are still coming out with the usual purple gradient just because you never loaded a skill before asking? Save and share 👍
Sources / links:
- Frontend Design (Anthropic)
- Impeccable (Paul Bakaus)
- Web Design Guidelines (Vercel Labs)
- UIUX Pro Max
- Astryx (agent-ready design system, from Meta)
- The Complete Guide to Building Skills for Claude
- My last article (8-step framework for creating skills):
