Use before implementing a plan, when the user asks for a second opinion on an approach, after ExitPlanMode, or whenever a draft design is on the table. Consult the repository's stewards via the Steward MCP server, return their attributed feedback, and, if the plan crosses a domain that no steward currently owns, propose a narrow new steward for that domain before code is written.

Write reliable, maintainable E2E tests with Playwright best practices. Use this skill when writing Playwright tests, debugging flaky tests, or setting up E2E automation. Activate when: playwright, e2e test, end-to-end, browser testing, UI automation, web testing.

Creates Playwright browser-based integration tests for Vaadin views covering navigation, form interactions, grid operations, and dialog handling. Use when the user asks to "write Playwright tests", "create e2e tests", "write integration tests", "test in the browser", or mentions end-to-end testing, browser tests, UI integration tests, or Playwright for Vaadin.

Helps design port traits and adapter implementations for external dependencies. Activates when users need to abstract away databases, APIs, or other external systems.

Posthog's UI design system. Use when building interfaces inspired by Posthog's aesthetic - dark mode, Inter font, 4px grid.

Prepare a Bitwarden design handoff — the Figma file in Ready-for-Dev state and the Jira state transitions that go with it. The end-of-In-Design gate / checklist.

Use this skill when the user needs to set pricing, design pricing tiers, choose value metrics, build a pricing page, or test price changes. Also use when the user mentions 'how much should I charge,' 'freemium vs free trial,' 'pricing page,' or 'monetization.' Covers pricing psychology, tier design, anchoring, self-selection mechanisms, and monetization strategy for SaaS.

Polished, business-ready design with modern typography, structured layouts, and a trustworthy visual identity.

Teaches the prototype pattern for property sharing via the prototype chain. Use when creating many objects of the same type that should share methods or properties efficiently.

Ramp's UI design system. Use when building interfaces inspired by Ramp's aesthetic - light mode, Inter font, 4px grid.

Raycast's UI design system. Use when building interfaces inspired by Raycast's aesthetic - light mode, Inter font, 4px grid.

Use this skill when handling errors from the RevenueCat Android SDK. Covers PurchasesError, the PurchasesErrorCode enum, the userCancelled flag on PurchasesTransactionException, and the recommended UI response per code.

React component patterns, best practices, and architecture guidelines

Add integration/E2E tests to existing codebase using Design Docs

Update existing design documents (Design Doc / PRD / ADR) with review

Replit's UI design system. Use when building interfaces inspired by Replit's aesthetic - light mode, Inter font, 4px grid.

Resend's UI design system. Use when building interfaces inspired by Resend's aesthetic - dark mode, Inter font, 4px grid.

Patterns for building responsive, mobile-first user interfaces

Throwback design with vintage-inspired typography, high-contrast retro palettes, and nostalgic visual elements.

Create design documentation from existing implementation

Rippling's UI design system. Use when building interfaces inspired by Rippling's aesthetic - dark mode, Inter font, 4px grid.

Robinhood's UI design system. Use when building interfaces inspired by Robinhood's aesthetic - dark mode, Inter font, 4px grid.

React Server Components architecture patterns for Next.js 14+ with server-first development. PROACTIVELY activate for: (1) deciding Server vs Client Component boundaries, (2) composing components with 'use client', (3) managing interactivity patterns. Triggers: "server component", "client component", "'use client'"

Monitor ADR-0217 real workloads across Redis queue, Restate, Dkron, and transitional Inngest using joelclaw CLI plus the pi TUI monitor extension. Use when asked to monitor jobs, watch runtime health, keep an eye on async work, run a workload dashboard, or report back on system state. Always pair with `pi-tui-design` for TUI work and `system-architecture` for topology truth.

Patterns for designing database schemas with proper normalization and relationships

Segment's UI design system. Use when building interfaces inspired by Segment's aesthetic - light mode, Inter font, 4px grid.

Ensure project structure exists before development, creating barebone scaffolding only if needed. Use when initializing new projects, validating project setup, or ensuring monorepo component structure.

shadcn/ui CLI usage, component installation, and composition patterns with file ownership philosophy. PROACTIVELY activate for: (1) adding shadcn/ui components via CLI, (2) composing multi-part components, (3) customizing component variants. Triggers: "shadcn", "add component", "components.json"

Shopify's UI design system. Use when building interfaces inspired by Shopify's aesthetic - light mode, Inter font, 4px grid.

Straightforward, no-frills design with clean typography, neutral colors, and intuitive layouts that stay out of the way.

Design skills that fire at the right moment — neither over-eager (noise) nor under-eager (silent). Covers activation specificity, trigger phrases, disambiguation between overlapping skills, and debugging activation. Use this skill when multiple skills could fire on the same query, a skill never fires, or a skill fires too often. Activate when: skill won't activate, skill over-activates, overlapping skills, skill triggers, skill selection, skill disambiguation.

Process screenshot-based UI/UX feedback to fix visual issues — use when users share screenshots of bugs

Build secure, reliable Slack integrations and bots. Use for webhook design, Block Kit UI, Socket Mode, and API best practices.

Slack's UI design system. Use when building interfaces inspired by Slack's aesthetic - light mode, Inter font, 4px grid.

Spotify's UI design system. Use when building interfaces inspired by Spotify's aesthetic - dark mode, Inter font, 4px grid.

Narrative-driven design using visuals, copy, and interaction to guide users through engaging, emotionally resonant journeys.

Substack's UI design system. Use when building interfaces inspired by Substack's aesthetic - light mode, Inter font, 4px grid.

Pick Lucide icons for a concept, UI placement, or vault note. Searches lucide.dev for real icon names. Use when the user says 'what icon for X', 'suggest a Lucide icon', 'pick an icon', or needs an icon for note frontmatter, a button, or a section header.

Supabase's UI design system. Use when building interfaces inspired by Supabase's aesthetic - dark mode, Inter font, 4px grid.

Guidelines for creating architecture overview and system explanation documentation. Use when writing content that clarifies system design, data flow, and architectural concepts.

Tailwind CSS v4 principles. CSS-first configuration, container queries, modern patterns, design token architecture.

Tailwind CSS utility-first styling with mobile-first responsive design and CSS variables. PROACTIVELY activate for: (1) implementing mobile-first responsive layouts, (2) using semantic CSS variables for theming, (3) creating component variants with cva. Triggers: "tailwind", "responsive", "dark mode"

Builds type-safe, accessible forms with TanStack Form, Base UI Field, and the useAppForm hook. Use when creating forms, adding validation, handling form submission, or working with form fields and form state management.

This skill should be used when the user is working on a prototype monorepo with the standard Bun workspace structure (core, types, api, ui, mcp packages), mentions "team defaults", "deviation protocol", "our conventions", "standard stack", asks about anti-patterns, or references @repo/types, @repo/core, Bun workspaces, or any of the stable packages. It also applies when the user mentions "plan mode" in the context of suggesting alternatives to established patterns.

When the user wants to add, optimize, or design customer testimonials, reviews, or case study sections. Also use when the user mentions "testimonials," "reviews," "customer quotes," "social proof," "case studies," "testimonial section," "customer reviews," "review schema," "testimonial design," or "social proof section." For case studies page, use customer-stories-page-generator.

Classic block-game inspired design with playful colors, bold display fonts, and compact, high-energy layouts.

Use when debugging across services/an incident where a fix in one place breaks another, or behavior is emergent and no single component explains it. Maps the system and traces causes.

Tldraw's UI design system. Use when building interfaces inspired by Tldraw's aesthetic - light mode, Inter font, 4px grid.

Todoist's UI design system. Use when building interfaces inspired by Todoist's aesthetic - light mode, Inter font, 4px grid.

TypeScript interface conventions for component props with JSDoc comments and utility types. PROACTIVELY activate for: (1) defining component prop interfaces, (2) using generics for reusable components, (3) integrating cva VariantProps. Triggers: "props", "interface", "VariantProps"

This skill provides frontend testing rules with Vitest, React Testing Library, and MSW. Automatically loaded when writing frontend tests, reviewing test quality, or when "Vitest", "React Testing Library", "MSW", "component test", or "frontend test coverage" are mentioned.

TypeScript patterns for type-safe API contracts with strict typing and Zod integration. PROACTIVELY activate for: (1) designing type-safe API interfaces, (2) creating Zod schemas for validation, (3) implementing generic response wrappers. Triggers: "api design", "type safety", "zod validation"

Minimal / clean / Linear / Notion / Vercel / whitespace-heavy UIs. Locked knobs: CRAFT=8, MOTION=3, DENSITY=2. Monochrome + one accent, Inter/Geist, hairline borders over shadows. Trigger on: minimal, clean, Linear-like, Notion-like, Vercel-like, whitespace-heavy.

Direct manual utility command reference for UI implementation workflows, including design feedback, QA checklist, screen-map updates, checks, scaffolding, and install commands.

Implement UFM (Umbraco Flavored Markdown) components in Umbraco backoffice using official docs

Vercel's UI design system. Use when building interfaces inspired by Vercel's aesthetic - light mode, Inter font, 4px grid.

Verify an RFC or design doc against the actual implementation — find drift, missing pieces, and undocumented changes

Apply when connecting React components to Store Framework blocks and render-runtime behavior in VTEX IO. Covers interfaces.json, block registration, block composition, and how storefront components become configurable theme blocks. Use for block mapping, theme integration, or reviewing whether a React component is correctly exposed to Store Framework.

Warp's UI design system. Use when building interfaces inspired by Warp's aesthetic - light mode, Inter font, 4px grid.

Build and manage pages, elements, components, and styles in Webflow Designer. Use when adding sections, creating layouts, building elements, inspecting or updating components, viewing what's inside a component, restructuring pages, creating new pages, previewing page structure, styling elements, or managing component properties. Requires Webflow Designer connection.

Declarative UI widgets from JSON for React/Next.js from ui.inference.sh. Render rich interactive UIs from structured agent responses. Capabilities: forms, buttons, cards, layouts, inputs, selects, checkboxes. Use for: agent-generated UIs, dynamic forms, data display, interactive cards. Triggers: widgets, declarative ui, json ui, widget renderer, agent widgets, dynamic ui, form widgets, card widgets, shadcn widgets, structured output ui

Wise's UI design system. Use when building interfaces inspired by Wise's aesthetic - light mode, Inter font, 4px grid.

Reference for modifying workflow.py or managing ~/.codex/docs/. Use when the user asks about workflow CLI commands, adding or updating docs, alias registration, workflow registry or lint issues, or fixing workflow command behavior. NOT for general CLI design principles (/cli-for-agents).

Generate documentation for custom elements based on their manifest data. Use when the user asks to "write docs", "generate documentation", "document this element", "create API docs", or mentions "usage examples" or "component documentation".

Design LLM-as-Judge evaluators for subjective criteria that code-based checks cannot handle. Use when a failure mode requires interpretation (tone, faithfulness, relevance, completeness). Do NOT use when the failure mode can be checked with code (regex, schema validation, execution tests). Do NOT use when you need to validate or calibrate the judge — use validate-evaluator instead.

Design zero-trust architecture. Never-trust-always-verify; every request authenticated, authorized, encrypted regardless of network location. Identity + device + context awareness. PEP at every boundary. Micro-segmentation. Continuous verification.

When the user wants to create, optimize, or audit 404 error pages. Also use when the user mentions "404 page," "404 error," "error page," "page not found," "broken link page," "404 design," "custom 404," "404 redirect," "404 page UX," or "404 recovery." For sitewide page planning, use website-structure.

Convert refined plan into technical specification with architectural decisions. Use when: (1) After REFINE phase in 5D-SDD workflow, (2) User is ready for technical design, (3) Moving from 'what' to 'how,' (4) User asks for 'technical spec,' 'architecture,' or 'design doc.' This phase bridges business intent and implementation detail.

This skill should be used when the user asks about "accessibility", "a11y", "WCAG", "screen readers", "keyboard navigation", "ARIA", "accessible design", "inclusive design", or mentions making apps accessible.

This skill should be used when the user asks about "UI design", "UX design", "user interface", "user experience", "wireframes", "mockups", "design patterns", "design system", "component design", "layout", or mentions UI/UX decisions.

Validate WCAG compliance, check screen reader support, and audit accessibility issues. Use when ensuring accessibility, fixing WCAG violations, or implementing inclusive design.

Manage incident action items from the terminal. Subcommands - list (default - your open action items) or add <incident> "<summary>" (create one on an incident). Use to capture follow-ups during or after an incident without opening the Rootly UI.

Designing effective alerts and runbooks for incident response. PROACTIVELY activate for: (1) Creating alerting rules, (2) Writing runbooks, (3) Reducing alert fatigue, (4) On-call escalation setup, (5) Incident response procedures. Triggers: "alerting", "runbook", "on-call", "pagerduty", "incident", "alert fatigue", "escalation", "playbook"

Stream agent output correctly — text deltas, tool-use events, thinking deltas, progress indicators — without dropping events or blocking on long tool calls. Covers backpressure, error handling, and UX patterns. Use this skill when building agent UIs (chat, CLI), ensuring agents feel responsive, or debugging dropped/truncated streams. Activate when: agent streaming, stream events, text deltas, streaming UI, SSE agent, stream tool use.

Use this skill when designing supervisor-based multi-agent systems. Activate when the user needs to orchestrate multiple AI agents, coordinate agent workflows, implement a central controller for agents, design hub-and-spoke agent architecture, or build hierarchical agent systems.

Batteries-included agent component for React/Next.js from ui.inference.sh. One component with runtime, tools, streaming, approvals, and widgets built in. Capabilities: drop-in agent, human-in-the-loop, client-side tools, form filling. Use for: building AI chat interfaces, agentic UIs, SaaS copilots, assistants. Triggers: agent component, agent ui, chat agent, shadcn agent, react agent, agentic ui, ai assistant ui, copilot ui, inference ui, human in the loop

Design, audit, and improve analytics tracking systems that produce reliable, decision-ready data. Use when the user wants to set up, fix, or evaluate analytics tracking (GA4, GTM, product analytics, events, conversions, UTMs). This skill focuses on measurement strategy, signal quality, and validation— not just firing events.

Create distinctive, production-grade frontend interfaces with high design quality. Use this skill when the user asks to build web components, pages, or applications. Generates creative, polished code that avoids generic AI aesthetics.

Patterns for designing RESTful and GraphQL APIs

Use when designing API endpoints, defining request/response schemas, generating OpenAPI specifications, choosing between REST/GraphQL/tRPC, or establishing API conventions for a project

Guide API design for REST, GraphQL, gRPC, and CLI interfaces. Use this skill when designing new APIs, reviewing existing API contracts, or establishing API conventions for a project. Produces consistent, well-documented API specifications.

REST and GraphQL API design best practices including OpenAPI specs. Use when designing APIs, documenting endpoints, or reviewing API architecture.

Designs RESTful APIs with endpoint naming, versioning strategies (URL path, header-based), pagination (offset and cursor), error response schemas, and OpenAPI conventions. Use when the user asks about REST API design, creating endpoints, URL structure, API versioning, status codes, Swagger, or OpenAPI specs.

Comprehensive API security for REST and GraphQL APIs. Use this skill when building or reviewing API endpoints, implementing authentication, or securing data transfer. Activate when: API security, REST security, GraphQL security, API authentication, API rate limiting, API versioning, secure endpoint, API design.

Apply Figma Make exported designs to website pages. Converts React/motion code to framework-appropriate code (Astro, Next.js, etc.) with CSS animations.

System architecture design and technical decision making for complex features

Design authentication strategy. Selects mechanism (password / MFA / SSO / passwordless / mTLS / API keys / JWT / session) per user population. Covers lifecycle (registration / auth / recovery / rotation / revocation).

Overview of the Blockbench MCP server tools, resources, and prompts. Use to understand the full MCP capability set, learn how tools work together, or when starting a new Blockbench project. Covers all domains (modeling, animation, texturing, PBR, UI, camera) and their MCP interfaces.

Capture decisions and context from the current conversation into blueprint docs, DESIGN.md, and design trees

Implement reviewer feedback on a Canva design. Reads all comment threads, synthesises what reviewers want, makes the clear-cut changes directly, and flags anything that needs a human decision. Use when the user asks to "implement feedback on my deck", "address comments on a design", "apply review feedback", "fix the comments on my presentation", or "implement the feedback".

Design CI/CD pipeline from source to prod. Tool selection, stages, quality gates, artifact management, deployment strategy (blue-green / canary / rolling / progressive), observability, secrets via OIDC.

Applies principles from Robert C. Martin's 'Clean Code'. Use this skill when writing, reviewing, or refactoring code to ensure high quality, readability, and maintainability. Covers naming, functions, comments, error handling, and class design.

Common clinical trial design patterns including multi-arm, multi-endpoint, adaptive, and stratified designs. Use when selecting or implementing trial designs.

Clinical trial design and analysis methods in R, including randomization, estimands, multiplicity, and reporting.

Use when a Clipboard frontend task involves UI polish, motion or animation decisions, interaction feel, small interaction details, visual hierarchy, component craft, or reviewing whether admin/mobile UI feels consistent with Clipboard's product and design-system standards.

Cloud architecture design for AWS / Azure / GCP or multi-cloud. Compute + regions/AZs + storage + networking + identity + managed services + cost. Well-Architected framework pillars.