JustineDevs
26 verified skills
responsive-design
Create responsive web designs that work across all devices and screen sizes. Use when building mobile-first layouts, implementing breakpoints, or optimizing for different viewports. Handles CSS Grid, Flexbox, media queries, viewport units, and responsive images.
development
authentication-setup
Design and implement authentication and authorization systems. Use when setting up user login, JWT tokens, OAuth, session management, or role-based access control. Handles password security, token management, SSO integration.
testing
building-with-medusa
Load automatically when planning, researching, or implementing ANY Medusa backend features (custom modules, API routes, workflows, data models, module links, business logic). REQUIRED for all Medusa backend work in ALL modes (planning, implementation, exploration). Contains architectural patterns, best practices, and critical rules that MCP servers don't provide.
tools
debugging-code
Interactively debug source code — set breakpoints, step through execution line by line, inspect live variable state, evaluate expressions against the running program, and navigate the call stack to trace root causes. Use when a program crashes, raises unexpected exceptions, produces wrong output, when you need to understand how execution reached a certain state, or when print-statement debugging isn't revealing enough.
development
design-with-taste
Apply the "Family Values" design philosophy to every UI you build. Use this skill whenever creating frontends, components, apps, landing pages, dashboards, or any user-facing interface. Enforces three core principles (Simplicity, gradual revelation; Fluidity, seamless transitions; Delight, selective emphasis) so that every output feels crafted, intentional, and alive. Prevents generic, static, lifeless UI. Works alongside other skills like frontend-design, web-animation-design, and more.
development
e2e-testing
End-to-end testing patterns with Playwright for full-stack Python/React applications. Use when writing E2E tests for complete user workflows (login, CRUD, navigation), critical path regression tests, or cross-browser validation. Covers test structure, page object model, selector strategy (data-testid > role > label), wait strategies, auth state reuse, test data management, and CI integration. Does NOT cover unit tests or component tests (use pytest-patterns or react-testing-patterns).
development
owasp-security
Implement secure coding practices following OWASP Top 10. Use when preventing security vulnerabilities, implementing authentication, securing APIs, or conducting security reviews. Triggers on OWASP, security, XSS, SQL injection, CSRF, authentication security, secure coding, vulnerability.
development
storefront-best-practices
ALWAYS use this skill when working on ecommerce storefronts, online stores, shopping sites. Use for ANY storefront component including checkout pages, cart, payment flows, product pages, product listings, navigation, homepage, or ANY page/component in a storefront. CRITICAL for adding checkout, implementing cart, integrating Medusa backend, or building any ecommerce functionality. Framework-agnostic (Next.js, SvelteKit, TanStack Start, React, Vue). Provides patterns, decision frameworks, backend integration guidance.
development
resend
Use when working with the Resend email API — sending transactional emails (single or batch), receiving inbound emails via webhooks, managing email templates, tracking delivery events, managing domains, contacts, broadcasts, webhooks, API keys, or setting up the Resend SDK. Always use this skill when the user mentions Resend, even for simple tasks like "send an email with Resend" — the skill contains critical gotchas (idempotency keys, webhook verification, template variable syntax) that prevent common production issues.
development
bolder
Amplify safe or boring designs to make them more visually interesting and stimulating. Increases impact while maintaining usability.
data-ai
agent-hub
Plug-and-play orchestration skill. User states a goal in natural language; the model runs commands/agent-hub.md (dispatcher), classifies work via agent/operating-model.md, then opens only the matching command or architecture doc (map, architect, memory, recovery, verify, next-pass, or one NN-layer). Layered docs for intent, policy, context, planning, routing, delegation, execution, MCP/tool boundaries, verification, memory, recovery, observability, human gates, release. Use for repo orchestration reviews, boundary work, memory/recovery design, permission-sensitive refactors.
tools
co-star-ui
CO-STAR UI Creator for React/Next.js: structured prompting to build or integrate UI (components, pages, design systems) or to create custom CO-STAR prompts. Use when the user wants to add hero sections, dashboards, design tokens, shadcn/Magic UI/Aceternity integration, Newsprint design system, or to draft their own CO-STAR prompt (Context, Objective, Style, Tone, Audience, Response). Always run discovery questions first, then plan, then implementation.
development
building-admin-dashboard-customizations
Load automatically when planning, researching, or implementing Medusa Admin dashboard UI (widgets, custom pages, forms, tables, data loading, navigation). REQUIRED for all admin UI work in ALL modes (planning, implementation, exploration). Contains design patterns, component usage, and data loading patterns that MCP servers don't provide.
tools
dogfood
Systematically explore and test a web application to find bugs, UX issues, and other problems. Use when asked to "dogfood", "QA", "exploratory test", "find issues", "bug hunt", "test this app/site/platform", or review the quality of a web application. Produces a structured report with full reproduction evidence -- step-by-step screenshots, repro videos, and detailed repro steps for every issue -- so findings can be handed directly to the responsible teams.
development
core-engineering
Object-oriented design and Core Engineering principles for AI agents and developers. Use when the user asks about OOP (four pillars), SOLID, encapsulation, abstraction, inheritance, polymorphism, Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion, composition over inheritance, DRY, KISS, YAGNI, Law of Demeter, or association vs aggregation vs composition. Includes how each principle looks and example code.
development
find-skills
Helps users discover and install agent skills when they ask questions like "how do I do X", "find a skill for X", "is there a skill that can...", or express interest in extending capabilities. This skill should be used when the user is looking for functionality that might exist as an installable skill.
data-ai
ui-ux-pro-max
UI/UX design intelligence for web and mobile. Includes 50+ styles, 161 color palettes, 57 font pairings, 161 product types, 99 UX guidelines, and 25 chart types across 10 stacks (React, Next.js, Vue, Svelte, SwiftUI, React Native, Flutter, Tailwind, shadcn/ui, and HTML/CSS). Actions: plan, build, create, design, implement, review, fix, improve, optimize, enhance, refactor, and check UI/UX code. Projects: website, landing page, dashboard, admin panel, e-commerce, SaaS, portfolio, blog, and mobile app. Elements: button, modal, navbar, sidebar, card, table, form, and chart. Styles: glassmorphism, claymorphism, minimalism, brutalism, neumorphism, bento grid, dark mode, responsive, skeuomorphism, and flat design. Topics: color systems, accessibility, animation, layout, typography, font pairing, spacing, interaction states, shadow, and gradient. Integrations: shadcn/ui MCP for component search and examples.
tools
test
Runs and scopes automated tests for this Turborepo (unit, package filters, Medusa stress, E2E, release gate). Use when the user asks to run tests, verify CI locally, debug failing tests, or choose the right test command for a changed package.
development
stripe-integration
Implement Stripe payment processing for robust, PCI-compliant payment flows including checkout, subscriptions, and webhooks. Use when integrating Stripe payments, building subscription systems, or implementing secure checkout flows.
development
seo-audit
When the user wants to audit, review, or diagnose SEO issues on their site. Also use when the user mentions "SEO audit," "technical SEO," "why am I not ranking," "SEO issues," "on-page SEO," "meta tags review," "SEO health check," "my traffic dropped," "lost rankings," "not showing up in Google," "site isn't ranking," "Google update hit me," "page speed," "core web vitals," "crawl errors," or "indexing issues." Use this even if the user just says something vague like "my SEO is bad" or "help with SEO" — start with an audit. For building pages at scale to target keywords, see programmatic-seo. For adding structured data, see schema-markup. For AI search optimization, see ai-seo.
development
programmatic-seo
When the user wants to create SEO-driven pages at scale using templates and data. Also use when the user mentions "programmatic SEO," "template pages," "pages at scale," "directory pages," "location pages," "[keyword] + [city] pages," "comparison pages," "integration pages," "building many pages for SEO," "pSEO," "generate 100 pages," "data-driven pages," or "templated landing pages." Use this whenever someone wants to create many similar pages targeting different keywords or locations. For auditing existing SEO issues, see seo-audit. For content strategy planning, see content-strategy.
development
security-best-practices
Implement security best practices for web applications and infrastructure. Use when securing APIs, preventing common vulnerabilities, or implementing security policies. Handles HTTPS, CORS, XSS, SQL Injection, CSRF, rate limiting, and OWASP Top 10.
development
web-design-guidelines
Review UI code for Web Interface Guidelines compliance. Use when asked to "review my UI", "check accessibility", "audit design", "review UX", or "check my site against best practices".
development
paypal-integration
Integrate PayPal payment processing with support for express checkout, subscriptions, and refund management. Use when implementing PayPal payments, processing online transactions, or building e-commerce checkout flows.
development
nextjs-performance
Expert Next.js performance optimization skill covering Core Web Vitals, image/font optimization, caching strategies, streaming, bundle optimization, and Server Components best practices. Use when optimizing Next.js applications for Core Web Vitals (LCP, INP, CLS), implementing next/image and next/font, configuring caching with unstable_cache and revalidateTag, converting Client Components to Server Components, implementing Suspense streaming, or analyzing and reducing bundle size. Supports Next.js 16 + React 19 patterns.
tools
context-engineering
Context Engineering patterns for AI development and prompting. Use when the user wants to reduce tokens, avoid lost-in-the-middle, and structure prompts using Skeleton-of-Thought, token-efficient diff updates, XML tagging, symbolic variables, negative constraints, or LLMBundle-style context packaging.
development