biggora
- 52 skills
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- 17 hours ago last updated
- ▌ Ecwid · biggora bundleThis skill should be used when the user asks to "create an Ecwid app", "Ecwid JavaScript SDK", "Ecwid REST API", "Ecwid storefront customization", "Lightspeed eCom app", "Ecwid App Market", "Ecwid payment integration", or needs guidance on Ecwid (Lightspeed eCom) app development and API integration.
- ▌ Sylius · biggora bundleThis skill should be used when the user asks to "create a Sylius plugin", "build a Sylius extension", "Sylius resource model", "Sylius API Platform", "Sylius admin customization", "Sylius payment plugin", "Sylius Twig templates", "Sylius service container", or needs guidance on Sylius plugin development with PHP/Symfony.
- ▌ Magento · biggora bundleThis skill should be used when the user asks to "create a Magento module", "build a Magento extension", "develop Magento 2 plugin", "Magento dependency injection", "Magento observers", "Magento plugins interceptors", "Magento REST API", "Magento GraphQL", "Magento admin page", "Magento layout XML", "publish to Adobe Commerce Marketplace", or needs guidance on Magento 2 / Adobe Commerce module development.
- ▌ Shopify · biggora bundleThis skill should be used when the user asks to "create a Shopify app", "build a Shopify extension", "develop Shopify checkout extension", "use Shopify GraphQL API", "Shopify Admin API", "Shopify Storefront API", "App Bridge", "Polaris components", "Shopify CLI", "publish to Shopify App Store", "Shopify theme app extension", "Shopify Functions", or needs guidance on Shopify app and extension development.
- ▌ Zencart · biggora bundleThis skill should be used when the user asks to "create a Zen Cart plugin", "Zen Cart module development", "Zen Cart observer notifier", "Zen Cart payment module", "Zen Cart template override", "Zen Cart auto-loader", or needs guidance on Zen Cart plugin and module development.
- ▌ Opencart · biggora bundleThis skill should be used when the user asks to "create an OpenCart extension", "build an OpenCart module", "OpenCart OCMOD", "OpenCart VQMOD", "OpenCart event system", "OpenCart MVC", "OpenCart payment extension", "publish to OpenCart marketplace", or needs guidance on OpenCart extension development.
- ▌ Volusion · biggora bundleThis skill should be used when the user asks to "integrate with Volusion", "Volusion API", "Volusion custom development", "Volusion store customization", or needs guidance on Volusion eCommerce API integration and store customization.
- ▌ Oscommerce · biggora bundleThis skill should be used when the user asks to "create an osCommerce addon", "osCommerce module development", "osCommerce payment module", "osCommerce shipping module", "osCommerce hook system", or needs guidance on osCommerce add-on and module development.
- ▌ Prestashop · biggora bundleThis skill should be used when the user asks to "create a PrestaShop module", "build a PrestaShop extension", "PrestaShop hooks", "PrestaShop webservices API", "PrestaShop admin controller", "PrestaShop payment module", "publish to PrestaShop Addons marketplace", or needs guidance on PrestaShop module development.
- ▌ Shift4shop · biggora bundleThis skill should be used when the user asks to "create a Shift4Shop app", "3dcart API", "Shift4Shop REST API", "Shift4Shop module", "Shift4Shop store customization", "3dcart development", or needs guidance on Shift4Shop (formerly 3dcart) app development and API integration.
- ▌ Virtuemart · biggora bundleThis skill should be used when the user asks to "create a VirtueMart plugin", "VirtueMart extension development", "VirtueMart payment plugin", "VirtueMart shipping plugin", "VirtueMart Joomla integration", "VirtueMart custom fields", or needs guidance on VirtueMart plugin development within the Joomla CMS ecosystem.
- ▌ Bigcommerce · biggora bundleThis skill should be used when the user asks to "create a BigCommerce app", "build a BigCommerce extension", "BigCommerce REST API", "BigCommerce GraphQL", "Stencil theme", "BigCommerce Checkout SDK", "BigCommerce widgets", "publish to BigCommerce App Marketplace", or needs guidance on BigCommerce app development.
- ▌ Nopcommerce · biggora bundleThis skill should be used when the user asks to "create a nopCommerce plugin", "build a nopCommerce extension", "nopCommerce dependency injection", "nopCommerce Entity Framework", "nopCommerce admin plugin", "nopCommerce payment plugin", "nopCommerce widget", "publish to nopCommerce marketplace", or needs guidance on nopCommerce plugin development with .NET/C#.
- ▌ Woocommerce · biggora bundleThis skill should be used when the user asks to "create a WooCommerce plugin", "build a WooCommerce extension", "develop a WooCommerce payment gateway", "add WooCommerce shipping method", "extend WooCommerce checkout", "customize WooCommerce admin", "use WooCommerce hooks", "WooCommerce REST API", "publish to WordPress.org", or needs guidance on WordPress/WooCommerce plugin development. Covers plugin architecture, hooks/filters, REST API, Blocks, HPOS compatibility, and marketplace publishing.
- ▌ Wix Ecommerce · biggora bundleThis skill should be used when the user asks to "create a Wix app", "build a Wix eCommerce extension", "Wix Velo development", "Wix eCommerce API", "Wix App Market", "Wix dashboard widget", "Wix Blocks", or needs guidance on Wix eCommerce app and extension development.
- ▌ Ecommerce Common · biggora bundleThis skill should be used when the user asks about "payment gateway integration", "shipping provider plugin", "e-commerce security", "PCI-DSS compliance", "product data normalization", "multi-currency support", "webhook handling", "e-commerce testing", or needs common patterns shared across multiple e-commerce platforms. Provides cross-platform e-commerce plugin development patterns.
- ▌ Squarespace Commerce · biggora bundleThis skill should be used when the user asks to "create a Squarespace extension", "Squarespace Commerce API", "Squarespace custom code", "Squarespace JSON-T templates", "Squarespace developer mode", or needs guidance on Squarespace Commerce customization and API integration.
- ▌ Ecommerce Marketplace Publishing · biggora bundleThis skill should be used when the user asks about "publish plugin to marketplace", "submit extension for review", "app store listing", "plugin versioning", "changelog format", "marketplace requirements", "code review checklist", or needs guidance on publishing e-commerce plugins to platform marketplaces.
- ▌ Captcha · biggora bundleIntegrate third-party CAPTCHA-solving services into automated browser sessions for authorized testing, QA, and legitimate automation workflows on sites you own or have permission to access. Use this skill when the user needs to: handle CAPTCHA challenges in Playwright or Puppeteer test suites, integrate reCAPTCHA v2/v3, hCaptcha, Cloudflare Turnstile, or image-based CAPTCHA solving into approved automation, or complete CAPTCHA token injection in QA scripts. Also triggers on technical terms: "recaptcha integration", "hcaptcha integration", "turnstile integration", "captcha solving service", "CAPTCHA token injection", "captcha API". Always use this skill for any authorized CAPTCHA-related automation — even simple cases benefit from correct token injection patterns.
- ▌ N8n API · biggora bundleUse for authenticated work with an n8n instance through its public REST API: discover capabilities, inspect or manage workflows and executions, credentials, tags, variables, projects, folders, data tables, users, audits, insights, source-control pulls, and supported instance settings. Do not use for ordinary workflow design with no API calls, undocumented internal /rest endpoints, or webhook handling alone.
- ▌ Web MCP · biggora bundleGuide for implementing WebMCP — the browser-native API that lets web pages expose structured tools to AI agents. Covers both the W3C standard (document.modelContext API, imperative and declarative approaches) and the original WebSocket-bridge implementation. Use this skill whenever the user asks about WebMCP, wants to add AI agent tools to a website, needs to expose web page functionality to browser agents, mentions 'document.modelContext', 'registerTool' in browser context, wants to create declarative tools from HTML forms, or is building any kind of browser-side MCP integration. Also use when the user mentions 'agentic web', 'tools for AI agents in the browser', or asks how to make a website work with AI assistants like Gemini, Claude, or ChatGPT browser agents.
- ▌ UI Audit · biggora bundleVisual-first UI/UX audit. Inspects a rendered interface (live URL, screenshots, Figma export, or a project's frontend) and reports visual defects, design-system violations, layout/spacing/typography/contrast problems, broken interactive states, accessibility gaps, responsive breakage, and localization/translation issues — each with category, symptom, impact, severity (Low/Medium/High/Critical), and a concrete fix. TRIGGER when the user asks to audit a UI, review design/look of a site/app/screen, find visual bugs, check alignment/spacing/contrast/typography/hierarchy, evaluate UX or visual quality, verify design-system compliance, find accessibility problems, or check translations/localization — incl. 'проверь дизайн', 'аудит интерфейса', 'UI ревью', 'проверь вёрстку', 'проверь переводы', 'проверь локализацию'. DISTINCT from functional QA: click-through/pass-fail flow testing uses test-web-ui ('does it work'); ui-audit answers 'does it look and read right'.
- ▌ Codex CLI · biggoraUse this skill whenever you need to install, configure, run, or automate tasks using OpenAI's Codex CLI (codex-cli). Trigger on any mention of "codex cli", "openai codex", "codex exec", "codex agent", "codex terminal", CI automation with Codex, approval modes (full-auto, read-only, on-request), sandbox policies, or when someone wants to use an AI coding agent from the terminal. Also trigger when the user wants to install codex, write codex config files (config.toml), run non-interactive codex sessions, integrate codex into GitHub Actions or CI pipelines, configure MCP servers for codex, set up codex profiles, or troubleshoot codex sandbox and approval issues.
- ▌ Keep Goal · biggora bundlePreserve task intent and repository context across long-running work with bootstrap, handoff, and evidence-based resume. Use for EN triggers: 'prepare a handoff for the next session', 'resume this long-running implementation', 'preserve task context'; RU triggers: 'сохрани контекст задачи', 'подготовь передачу следующей сессии', 'восстанови работу по progress-файлу'.
- ▌ Tm Search · biggora bundleUse this skill whenever the user wants to search, validate, or look up US trademarks, brand names, or keywords in the USPTO trademark database. Triggers include: checking if a brand name or word is trademarked, searching trademark registrations, validating whether a keyword is available for trademark, looking up trademark status or owner, batch-checking multiple brand names, or building any tool/script involving the USPTO trademark database. Also use for requests like "is X trademarked?", "find trademarks for [keyword]", "check trademark availability", "search USPTO for [name]", or "validate these words against USPTO trademarks." Always use this skill for any trademark search or validation task — even simple lookups benefit from the correct API patterns and output formats defined here.
- ▌ Gemini CLI · biggora bundleUse this skill whenever the user wants to install, configure, or use the Gemini CLI (gemini-cli) tool. Trigger this skill for tasks such as: installing gemini-cli via npm/npx/brew, setting up authentication (API key, Google OAuth, Vertex AI), running non-interactive/headless prompts with -p flag, configuring settings.json, creating GEMINI.md context files, writing custom slash commands (.toml files), connecting MCP servers, creating extensions, automating tasks with shell scripts, using --output-format json/stream-json, managing chat sessions, using /memory commands, --auto-approve mode, Application Default Credentials (ADC), or any scripting/automation involving gemini-cli. Also trigger when user asks about integrating Gemini models into CLI workflows, CI/CD pipelines, or programmatic use of the Gemini API through the CLI tool.
- ▌ Define Done · biggora bundleTurn an ambiguous feature or bug request into a confirmed, evidence-backed product specification and Definition of Done. Use for English triggers such as 'define acceptance criteria before building this feature' and 'turn this vague request into a product spec', and Russian triggers such as 'сформулируй критерии готовности' and 'уточни требования перед реализацией'.
- ▌ Notebook Lm · biggora bundleAutomate Google NotebookLM via the notebooklm-py Python library. Use this skill whenever the user wants to create, manage, or delete NotebookLM notebooks; add sources (URLs, YouTube, PDFs, files, text, Google Drive) to a notebook; ask questions or chat with notebook content; generate content like Audio Overview (podcast), Video Overview, Quiz, Flashcards, Slide Deck, Infographic, Report, Data Table, or Mind Map; download generated artifacts (MP3, MP4, PDF, PNG, CSV, JSON, Markdown); run web/Drive research and auto-import results; manage sharing, notes, and source full-text extraction; or automate any NotebookLM workflow programmatically. Trigger this skill for ANY request involving NotebookLM, notebooklm-py, Google NotebookLM automation, podcast/audio overview generation from notes, or bulk research pipelines.
- ▌ Test Web UI · biggora bundleAutomated web QA skill: analyzes a website or project, generates end-user use cases, derives a structured test plan, executes tests via Playwright browser automation, and produces a full HTML/Markdown QA report with screenshots and pass/fail results. TRIGGER this skill whenever the user asks to: test a website, run QA on a web app, check if a site works, find bugs on a site, validate a web project, create a test plan for a website, run functional tests, check a landing page, audit a web app for issues, test user flows — or any variation of "проверить сайт", "протестировать сайт", "QA сайта", "тест веб-приложения", "найти баги на сайте". Even if the user just says "посмотри работает ли всё нормально на сайте" — use this skill.
- ▌ Autoresearch · biggora bundleAutonomous iterative improvement loop (Agent-Optimizer pattern) for optimizing ANYTHING measurable. Apply when the user wants to: optimize, tune, improve, benchmark, iterate, experiment autonomously, maximize/minimize a metric, run A/B variants automatically, find the best config/prompt/algorithm. Trigger phrases (EN): "optimize this", "make it faster", "improve the score", "auto-tune", "run experiments", "find the best version", "benchmark and improve", "keep iterating until better", "autonomous optimization", "self-improving loop". Trigger phrases (RU): "оптимизируй", "улучши показатель", "автоматически подбери параметры", "прогони эксперименты", "найди лучший вариант", "итерируй пока не улучшится", "настрой автоматически", "бенчмаркинг и улучшение". Domain coverage: code performance, prompt engineering, email copy, config tuning, CSS/Lighthouse scores, database queries, test coverage, text readability, business process throughput — anything where "better" can be expressed as a single number.
- ▌ Commafeed API · biggoraUse this skill whenever the user wants to interact with a CommaFeed RSS reader instance via its REST API. Triggers include: listing, subscribing, unsubscribing from RSS feeds; reading, starring, or tagging feed entries; managing categories; marking entries as read/unread; importing or exporting OPML; managing user settings or profile; viewing unread counts; refreshing feeds; fetching feed info by URL; administering users on a CommaFeed instance. Also use for requests like "show my feeds", "subscribe to RSS feed", "list unread articles", "star this entry", "export my feeds as OPML", "mark all as read", "get unread count", or "refresh my feeds". Always use this skill for any CommaFeed API interaction.
- ▌ Tdd Red Green · biggora bundleImplement one behavior at a time with safe test-driven development and reproduce-or-abstain bug fixing. Use for EN triggers: 'implement this behavior test-first', 'reproduce then fix this bug', 'use RED GREEN REFACTOR'; RU triggers: 'реализуй через тесты', 'сначала воспроизведи и исправь баг', 'реализуй через RED GREEN REFACTOR'.
- ▌ Slice Vertical · biggora bundleTurn an approved specification into ordered, independently demonstrable vertical slices with executable evidence. Use for requests such as 'break this approved team-invitations spec into vertical slices', 'plan tracer-bullet delivery', 'разбей утверждённую фичу на вертикальные срезы', or 'составь план вертикальных срезов'; do not use before the specification and acceptance criteria are approved.
- ▌ Text To Speech · biggora bundleConverts any text to speech audio files fully autonomously, without user intervention. Use this skill whenever a user asks to: "convert text to speech", "generate audio narration", "create a voiceover", "make a TTS audio file", "add narration to a video", "generate MP3/WAV from text", "create audio for a presentation", or anything involving producing spoken audio from written text. Also trigger when user needs audio narration for product videos, demos, slideshows, or automated workflows. Always use this skill before generating any video narration, even if narration seems like a minor part of the task.
- ▌ Youtube Search · biggora bundleSearch YouTube for videos, channels, and playlists — and extract rich metadata, transcripts, and analytics — fully autonomously without user intervention. Use this skill whenever the user mentions finding YouTube videos, searching YouTube, getting video stats, extracting transcripts or subtitles, analyzing a YouTube channel, looking up what's trending on YouTube, finding competitor videos, researching YouTube content, or automating any YouTube data collection workflow. Trigger even for indirect requests like 'find the top videos about X' or 'what's on YouTube about Y' — if YouTube content retrieval is involved in any way, use this skill.
- ▌ Test Mobile App · biggora bundleAutomated mobile application testing skill. Use this skill whenever the user wants to test a mobile app (Android or iOS), write test cases, analyze app structure, run automated UI tests via emulator, or generate test reports. Trigger when user mentions: "test my app", "run tests", "UI testing", "write test cases", "check app functionality", "test on emulator", "mobile QA", "test coverage", "use case testing", "user scenario testing", or any combination of mobile + test/check/verify/validate. Also trigger when user uploads or references an APK, .ipa, or a mobile project folder (React Native, Flutter, Android, iOS) and asks what to do next. Always use this skill for any mobile app QA task — even partial ones like "just write some use cases" or "show me what tests I should run".
- ▌ Brand Guidelines · biggora bundleCreates comprehensive brand guidelines documents (brand books) for any brand. Guides users through a structured brand interview, collects colors, typography, logo usage rules, tone of voice, and visual style, then generates a professional self-contained HTML brand book. Use when a user asks to: "create brand guidelines", "make a brand book", "design a style guide", "build brand standards", "create visual identity guidelines", "document our brand", or wants to formalize their brand's look and feel. Also use when the user provides brand assets (colors, logos, fonts) and wants them organized into a cohesive document. Always use this skill for any brand guidelines or brand book creation task, even if the user just says "I need a style guide" or mentions brand colors and fonts in a design context.
- ▌ Klix Integration · biggora bundleUse this skill whenever the user wants to integrate Klix payment gateway into a website or application. Triggers include: adding Klix payments, checkout integration, payment processing with Klix, card payments via Klix, Apple Pay/Google Pay through Klix, bank payments (PIS) in Baltic countries, Klix Pay Later / installments, recurring payments, payment reservations/captures, Klix widget setup, Klix API calls, or any mention of Klix as a payment provider. Also use when the user mentions "klix.app", "Klix by Citadele", or needs to accept payments in Latvia, Lithuania, or Estonia using local banks. Always use this skill for any Klix-related payment integration work, even if the user just says "add payments" in a Baltic-region project context. Also triggers on: "@biggora/klix", "klix npm", "klix SDK", "klix TypeScript SDK", "klix module", "NestJS klix", "klix client library".
- ▌ Screen Recording · biggora bundleRecord the actual screen to video. Use this skill whenever a user asks to: "record my screen", "capture my screen", "make a screen recording", "screencast", "record what's on screen", "capture desktop", "record a video of my screen", "take a video of my desktop", "screen capture to video", or anything involving recording the actual display output to an MP4/video file. Also supports creating synthetic demo videos programmatically when no real screen capture is needed (product demos, animated presentations). Always trigger this skill for any screen recording, screen capture, or video creation task.
- ▌ Harden Agent Loop · biggora bundleDesign external quality gates, guardrails, and tool contracts for coding-agent harnesses, or turn repeated failures into regression evals. Use for 'add guardrails to this coding agent', 'turn repeated agent failures into regression evals', 'настрой внешние quality gates', or 'улучши harness по трассам'; not for ordinary code or performance optimization.
- ▌ Typescript Expert · biggora bundleApply TypeScript-specific guidance for type design, compiler diagnostics, tsconfig and module resolution, declaration emit, JavaScript migration, and version upgrades. Use when the task turns on TypeScript semantics or tooling; do not load it merely because an otherwise unrelated project happens to use TypeScript.
- ▌ Youtube Thumbnail · biggoraGenerates professional YouTube thumbnails in 11 strategic styles with auto-detection of AI image backends (A1111, ComfyUI, MCP Imagen 4, Gemini API, fal.ai FLUX, OpenAI gpt-image-1) and Pillow compositing. Trigger when the user asks to create, generate, or design a YouTube thumbnail, video cover, channel art, or presentation title slide. Also trigger for batch thumbnail creation or YouTube visual workflow automation.
- ▌ Lv Aggregators API · biggora bundleUse this skill whenever the user wants to work with Latvian price comparison / aggregator platforms, specifically Salidzini.lv or KurPirkt.lv. Triggers include: creating or generating XML product feeds, integrating an e-commerce store with Latvian aggregators, exporting product catalogs for salidzini or kurpirkt, validating XML feed format, debugging feed errors, setting up product data export for Latvian price comparison sites, or any mention of "salidzini", "kurpirkt", "cenu salīdzināšana", "preču eksports", "XML feed Latvia", "Latvian marketplace integration", or "price aggregator feed". Also use when the user mentions e-commerce product feeds for the Latvian market, product data export in LV context, or wants to list products on Latvian comparison shopping engines, even without naming a specific platform.
- ▌ SEO Best Practices · biggora bundleWhen the user wants to audit, review, or diagnose SEO on their site — technical, on-page, content, international, or off-page. Use when they mention "SEO audit," "technical SEO," "why am I not ranking," "traffic dropped," "lost rankings," "not showing up in Google," "Google update hit me," "page speed," "Core Web Vitals," "crawl errors," "indexing issues," "currently not indexed," "on-page SEO," "meta tags," "duplicate content," "keyword cannibalization," "search intent," "content refresh," "hreflang," "international SEO," "local SEO," or "backlinks." Trigger even on vague asks like "my SEO is bad" or a post-migration traffic drop — start with an audit. Do NOT use this skill for adjacent work; route instead. Structured data / JSON-LD → schema. AI Overviews or generative-engine optimization → ai-seo. Keyword-target pages at scale → programmatic-seo. Navigation, URL hierarchy, or information architecture → site-architecture. Conversion rate → cro. Analytics or GA4 setup → analytics.
- ▌ Verify Before Done · biggora bundleRequire fresh, acceptance-linked evidence before any completion claim, merge or PR readiness statement, or release check. Use for EN triggers such as 'prove this task is complete' and 'is this ready to merge?', and RU triggers such as 'докажи, что задача завершена' and 'проверь готовность перед релизом'.
- ▌ Google Merchant API · biggora bundleUse this skill whenever the user wants to work with Google Merchant Center APIs, including the new Merchant API (v1) or the legacy Content API for Shopping (v2.1). Triggers include: uploading or managing products, product feeds, inventory management (local/regional), promotions, data sources, reports, merchant reviews, product reviews, shipping settings, account management, order tracking, conversion sources, or any Google Shopping integration. Also use for tasks like "add products to Google Shopping", "sync inventory with Merchant Center", "set up product feeds", "manage promotions", "get shopping performance reports", "migrate from Content API to Merchant API", "configure shipping in Merchant Center", or "upload product data to Google". Use this skill even when the user mentions e-commerce product feeds, Google Shopping listings, or product data specifications without explicitly naming the API.
- ▌ Nest Best Practices · biggora bundleImplement, review, test, or migrate NestJS applications with version-aware patterns. Use for @nestjs/* APIs, modules, validation, transports, testing, or CLI; inspect the installed major before v12 guidance.
- ▌ Next Best Practices · biggora bundleApply current Next.js App Router practices for routing, Server and Client Components, data access, caching, mutations, navigation, metadata, and performance. Use when implementing, reviewing, debugging, or upgrading a Next.js application. Inspect the installed Next.js version and Cache Components mode before choosing APIs; do not apply 16.3-only behavior to older projects.
- ▌ Paysera Integration · biggora bundleUse this skill whenever the user wants to integrate PaySera payment gateway into a website or application. Triggers include: adding PaySera payments, PaySera Checkout V3 integration, payment processing with PaySera, card payments via PaySera, bank transfers through PaySera, e-wallet payments in EU/Baltic countries, PaySera order creation, PaySera webhooks, PaySera refunds, PaySera payment capture, or any mention of PaySera as a payment provider. Also use when the user mentions "paysera.com", "PaySera Checkout", or needs to accept payments across the EU using PaySera's payment infrastructure. Also triggers on: "@biggora/paysera", "paysera npm", "paysera SDK", "paysera TypeScript SDK", "paysera module", "NestJS paysera", "paysera client library", "PaySera Checkout V3 API", "paysera OAuth".
- ▌ Vite Best Practices · biggora bundleConfigure, migrate, debug, or review Vite applications, libraries, SSR integrations, and plugins. Use for vite.config files, HMR, import.meta APIs, Vite environment variables, Rolldown/Oxc migration, dependency optimization, or the Environment API; do not use for framework behavior that does not involve Vite.
- ▌ Delegate Bounded Work · biggora bundleCoordinate narrow delegated work and unbiased verification while keeping small tasks single-agent. Use for 'delegate this large repository survey', 'run an independent fresh-context review', 'сформируй узкий контракт для субагента', or 'проведи независимую проверку в свежем контексте'; do not delegate a small coherent local edit without a concrete benefit.
- ▌ Tailwindcss Best Practices · biggora bundleTailwind CSS v4 implementation and review guidance. Use when installing Tailwind, styling UI, building responsive or dark-mode layouts, extending CSS-first themes and utilities, diagnosing class detection, or migrating from v3. Covers stable v4.3 behavior; inspect the project's installed version before applying version-specific advice.