Skills
96,770 packaged capabilities and playbooks for agents. Install any of them with one command.
Design & UI
Translates an image (or a set of image references — screenshots, mockups, Figma URLs, live websites) into two mirrored design-system artifacts: `docs/design.md` (YAML tokens + prose, following Google's open [design.md](https://github.com/google-labs-code/design.md) format, for the coding agent) and `docs/design.html` (a self-contained, token-driven style guide rendering every token and component live, for the human to read). Reads the imagery, asks targeted clarifying questions, derives the design tokens (colors, typography, spacing, rounded, components), and writes both files. Fully standalone — requires no other document or skill. Use when the founder says "create a design system", "design from image", "translate image to design", "create design.md", "image to design system", "extract design tokens", or shares an image with no other clear intent.
Direct-invocation specialist for polished, responsive, self-contained HTML mockups and interactive prototypes grounded in the user's conversation, product context, and design language. Use when the user explicitly invokes html-prototype or the broad html skill routes a mockup or prototype request here. Do not activate independently from a general request. Treat a mockup as a noninteractive fidelity mode within this skill, not as a separate skill.
UI/UX design intelligence. 50 styles, 21 palettes, 50 font pairings, 20 charts, 9 stacks (React, Next.js, Vue, Svelte, SwiftUI, React Native, Flutter, Tailwind, shadcn/ui). Actions: plan, build, create, design, implement, review, fix, improve, optimize, enhance, refactor, check UI/UX code. Projects: website, landing page, dashboard, admin panel, e-commerce, SaaS, portfolio, blog, mobile app, .html, .tsx, .vue, .svelte. Elements: button, modal, navbar, sidebar, card, table, form, chart. Styles: glassmorphism, claymorphism, minimalism, brutalism, neumorphism, bento grid, dark mode, responsive, skeuomorphism, flat design. Topics: color palette, accessibility, animation, layout, typography, font pairing, spacing, hover, shadow, gradient. Integrations: shadcn/ui MCP for component search and examples
Publish your own work to 21st.dev and manage it from the terminal with the `21st` CLI (`@21st-dev/cli`): publish a React component to a team library, publish a CSS theme or a template listing, edit / unpublish / delete your published items, list and reopen existing component work, and read/replace your public profile page (bento board). Triggers when the user says "publish/share/upload this to 21st", "залей в наш регистр", "опубликуй компонент/тему/темплейт", "share with team", "make this reusable", "unpublish/edit/delete my component", "change its visibility", "find/open my old component or draft", "найди/открой мой старый компонент или драфт", "add this to my 21st profile/bento", "update my profile page", "обнови мой профиль на 21st", "добавь блок в бенто", "add controls/knobs to my demo", "сделай демо с контролами". For finding and installing existing items use `21st-cli-use`; for turning a project's design tokens into a theme use `21st-design-sync`.
Direct-invocation specialist for low-fidelity, self-contained HTML wireframes that test information hierarchy, content, navigation, task flow, and responsive structure before visual design. Use when the user explicitly invokes html-wireframe or the broad html skill routes a wireframe request here. Do not activate independently from a general request. Do not use for polished mockups or production-like interaction; use html-prototype for those.
Design UIs in Pencil (.pen files) and generate production code from them. Use when working with .pen files, designing screens or components in Pencil, or generating code from Pencil designs. Triggers on tasks involving Pencil, .pen files, design-to-code workflows, or UI design with the Pencil MCP tools.
When the user wants to design, deploy, or measure Apple Custom Product Pages (CPP) — the alternate App Store product pages with different screenshots, preview videos, and promo text shown to users coming from specific URLs (typically ad campaigns or social posts). Use when the user mentions "Custom Product Page", "CPP", "alternate product page", "App Store URL variant", "ASA CPP", "campaign-specific landing page", "product page per audience", "App Store Connect CPP", "ppoUrl", "?cpp=" parameter, or "show different screenshots to different ad audiences". For App Store A/B tests on the default page, see ab-test-store-listing. For paid ad campaigns that route to CPPs, see apple-search-ads or ua-campaign.
Create banners using AI image generation. Discuss format/style, generate variations, iterate with user feedback, crop to target ratio. Use when user wants to create a banner, header, hero image, cover image, GitHub banner, Twitter header, or readme banner.
Semantic Design System Skill for Google Stitch. Generates agent-friendly DESIGN.md files that enforce premium, anti-generic UI standards — strict typography, calibrated color, asymmetric layouts, perpetual micro-motion, and hardware-accelerated performance.
Elite website image-to-code skill for Codex. For visually important web tasks, it must first generate the design image(s) itself, deeply analyze them, then implement the website to match them as closely as possible. In Codex, it must prefer large, readable, section-specific images instead of tiny compressed boards, generate fresh standalone images for sections or detail views instead of cropping old ones, avoid lazy under-generation, avoid cards-inside-cards-inside-cards UI, and keep the hero clean, spacious, readable, and visible on a small laptop.
Look at the current project's design (its shadcn / Tailwind CSS variables and color tokens) and publish it to the 21st.dev community as a shareable theme, using `21st publish-theme`. Use when the user says "publish my theme", "share our design as a 21st theme", "sync my design to 21st", "turn my globals.css into a theme", "залей наш дизайн темой", "опубликуй тему". This is the 21st equivalent of design-sync: it reads the project's design tokens and syncs them into the public theme library.
A template-driven skill for data visualization, PPT presentations, and full-page report generation. It can generate HTML charts strictly from the actual implementations in Lupi, Basics, Glance, Maps, and Interactive gallery; create HTML/PDF presentations with Presentation Mode; or generate full-page HTML reports from report templates. Mono is the fallback; it can automatically select built-in color presets based on data semantics and also supports user-provided custom palettes. Use maps only when explicitly requested, and do not mix color schemes within the same deliverable.
One book → one clear “viewfinder” concept image → one 2050 library card (PNG). The viewfinder captures the angle from which the author examines an issue and the image they see; the card includes the real cover, author portrait, and bibliographic details. The viewfinder block uses Feynman-style explanations to make the concept image clear and accurate; the illustration block uses AI image generation to depict it, with Jijang as the fixed protagonist (generated from a reference ink portrait and recognizable as him). Illustration style: picture-book feel in the style of Yoshida Seiji (everyday spaces in another world, warm slanting light, soothing yet refined). Light optical-glass card body, accent color dynamically extracted from the cover, adaptive aspect ratio. Close the book and remember this image, and the reading won’t be in vain. Use when the user says “取景框卡,” “图书馆卡,” “library card,” “书卡,” “铸书卡,” “一本书一句话一张卡,” “/ljg-library,” or provides a book title and wants it distilled into one collectible card. NOT FOR structural book analysis (use ljg-book), text-only quotes (use ljg-card -b), infographics (use ljg-card -i), or visual notes (use ljg-card -v).
Apply the Law of Proximity — spatial closeness groups elements more strongly than any other cue. Use when spacing alone must carry grouping. For grouping via containers use `law-of-common-region`; via shared appearance use `law-of-similarity`.
Test website responsiveness across viewport widths using browser automation. Resizes a single session through breakpoints, screenshots each width, and detects layout transitions (column changes, nav switches, overflow). Produces comparison reports showing exactly where layouts break. Trigger with 'responsiveness check', 'check responsive', 'breakpoint test', 'viewport test', 'responsive sweep', 'check breakpoints', or 'test at mobile'.
Help users define problems clearly before jumping to solutions. Use when someone is scoping a new feature, validating a product idea, struggling to articulate what they're building, or falling into the “shiny object trap” with new technology.
Guide a product discovery conversation and write product-brief.md with the problem, evidence, scope, decisions, and the next uncertainty to resolve. Use for product discovery, defining a product, or refreshing its brief. Supports existing products, client ideas, and own ideas.
Apply a refined Scandinavian visual system with a neutral black-and-white foundation, restrained sans-serif typography, purposeful product imagery, generous spacing, clear page chapters, and minimal decoration. Use when the user invokes /scandinavian-design or requests a Nordic, monochrome, calm, spacious, restrained, or minimalist interface.
Turn vague taste, screenshots, URLs, product notes, or "make it feel like this" references into a grounded DESIGN.md plus an implementation handoff. Use it before prototypes, decks, redesigns, or image remix work when the user needs a reusable visual direction rather than a one-off prompt.
Migrate Chakra UI projects from v2 to v3, covering package changes, codemods, provider setup, color mode, prop renaming, compound components, theming, recipes, and Next.js updates. Use this skill whenever a user is upgrading Chakra UI versions, encountering breaking changes after an upgrade, converting old v2 patterns (ColorModeScript, useColorModeValue, styleConfig, extendTheme, isDisabled, colorScheme, @chakra-ui/icons, framer-motion dependency), fixing compound component patterns, or asking about differences between Chakra UI v2 and v3 — even if they don't say “migrate” or “upgrade” explicitly.
UI/UX quality gate and build guide for every visual output — landing pages, dashboards, web apps, portfolios, and tools. ui-design remains the main entry point. Integration model: ui-design main trunk + taste-skill overlay. - ui-design owns engineering quality (track selection, component-library strategy, accessibility, responsiveness, theming, performance, preview delivery) - taste-skill is invoked inside the ui-design workflow for style decisions (Brief Inference, Design Dials, Anti-slop hard rules) MUST USE together with project-builder whenever a project produces visual HTML/CSS/JS.
Create a comprehensive brand standards document — covering logo usage, color, typography, voice, messaging, and application rules. Use when the user says "brand guidelines", "brand standards", "brand book", "style guide", "brand guide", "brand manual", "brand rules", "brand documentation", "brand toolkit", "onboarding designers or copywriters", "need a document for the team", "brand consistency across teams", or wants to codify all brand decisions into a reusable reference document.
Build web interfaces with genuine design quality, not AI slop. Use for any frontend work—landing pages, web apps, dashboards, admin panels, components, interactive experiences. Activates for both greenfield builds and modifications to existing applications. Detects existing design systems and respects them. Covers composition, typography, color, motion, and copy. Verifies results via screenshots before declaring done
Define how the system evolves — contribution model, versioning, deprecation, and change management. Use when multiple teams contribute. For driving uptake use `design-system-adoption` (designer-toolkit); for design file history use `version-control-strategy` (design-ops).
Inventory and prioritise accumulated design inconsistencies across a product. Use when drift has built up over time. For token coverage specifically use `design-token-audit` (designer-toolkit); for WCAG gaps use `accessibility-audit` (design-systems).
Design principles and creative direction for building HTML artifacts — pages, reports, plans, landing pages, demos, decks, and small tools. Use when creating or restyling any visual HTML deliverable and deciding its palette, type pairing, layout, theming, or overall register, or when the output must not look generically AI-generated.
Use when the user asks to build a brand or requests a task matching the examples below. Build a practical brand identity from any input — an idea, an existing website, a list of reference brands, product photos, or “I want to rebrand X.” Default to a fast quick-brand path for founder-kit users, and offer the full 14–16-page guidelines as an opt-in upgrade. Use when someone wants a brand identity but does NOT need a full commerce launch (no Shopify, no product listings, no social posting). Trigger phrases: “build me a brand,” “make me a brand,” “design a brand identity,” “brand guidelines for [X],” “I want a brand book,” “create a brand from scratch,” “brand for [idea],” “I want a brand that feels like [X] + [Y],” “rebrand my [thing],” “visual identity for [thing],” “build-a-brand.”
Define what content a product needs, how it is structured, and who owns it. Use when content itself is the problem. For the words in the interface use `ux-writing` (designer-toolkit); for structural hierarchy use `information-architecture`
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An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.