Web & Frontend

nota-america Skill

Build or extend a playable isometric action RPG in Three.js, React, or similar web technology. Use for game-loop architecture, camera and movement, zones, combat integration, content data, progression, saves, or production-ready vertical slices.

nota-america Bundle

Suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using modern frontend web technologies (React, Tailwind CSS, shadcn/ui). Use for complex artifacts requiring state management, routing, or shadcn/ui components - not for simple single-file HTML/JSX artifacts.

nota-america Skill

Test a playable browser game end to end with deterministic fixtures and real browser evidence. Use for gameplay QA, regression testing, controls, accessibility, responsive/mobile testing, save flows, console checks, performance smoke tests, and release verification.

bg-szy Skill

Accessibility audit for frontend changes — WCAG 2.2 AA, screen-reader compatibility, keyboard navigation, focus management, ARIA correctness, color contrast, and reduced-motion. Static diff-scoped analysis (safe to auto-run) plus an optional dynamic axe pass against a running app. Use when asked to "check accessibility", "a11y audit", "screen reader check", "WCAG", "is this accessible", "keyboard navigation", "ARIA review", or after heavy frontend work.

bg-szy Skill

iOS and Swift development expert covering Swift best practices, SwiftUI patterns, Human Interface Guidelines compliance, accessibility audits, navigation patterns, and app architecture. Use when building iOS apps, reviewing Swift code, or planning app architecture.

bg-szy Skill

Turn any folder of code, docs, papers, or images into a queryable knowledge graph — interactive HTML, GraphRAG-ready JSON, and a plain-language audit report.

bg-szy Skill

Analyzes web performance using Chrome DevTools MCP. Measures Core Web Vitals (LCP, INP, CLS) and supplementary metrics (FCP, TBT, Speed Index), identifies render-blocking resources, network dependency chains, layout shifts, caching issues, and accessibility gaps. Use when asked to audit, profile, debug, or optimize page load performance, Lighthouse scores, or site speed. Biases towards retrieval from current documentation over pre-trained knowledge.

bg-szy Skill

Design finalization: generates production-quality Pretext-native HTML/CSS. Works with approved mockups from /design-shotgun, CEO plans from /plan-ceo-review, design review context from /plan-design-review, or from scratch with a user description. Text actually reflows, heights are computed, layouts are dynamic. 30KB overhead, zero deps. Smart API routing: picks the right Pretext patterns for each design type. Use when: "finalize this design", "turn this into HTML", "build me a page", "implement this design", or after any planning skill. Proactively suggest when user has approved a design or has a plan ready. (gstack) Voice triggers (speech-to-text aliases): "build the design", "code the mockup", "make it real".

bg-szy Skill

Expert UI/UX design collaboration for creating unique, accessible interfaces. Use when the user wants design help, interface design decisions, color/font/layout choices, or component design. ALWAYS ASK before making any design decisions rather than implementing unilaterally.

bg-szy Skill

Install a complete design-token theme into any project in one pass -- pulls a style from the Open Agent Stack design-styles collection (aurora-mesh, cirrus, liquid-glass, mono-brutalist, neo-terminal, sand-terra, tidal) or a local tokens.json, wires it into Tailwind/CSS, and repaints existing components to match.

bg-szy Skill

Create error boundaries, error handling, and fallback UIs for React applications. Use when implementing error handling, creating fallback components, or setting up error reporting.

bg-szy Skill

Uses 1M context window to ingest an entire codebase and output a file-by-file migration plan. Supports JS to TS, React class to hooks, framework migrations, and more. Generates migration-plan.md with file inventory, dependency graph, migration order, file-by-file changes, estimated effort, and risk assessment.

bg-szy Skill

Uses Managed Agents' 14.5-hour runtime to audit an entire codebase overnight. Security, performance, accessibility, dependency issues. You wake up to a full report.

bg-szy Bundle

Idiomatic TypeScript development. Use when writing TypeScript code, Node.js services, React apps, or discussing TS patterns. Emphasizes strict typing, composition, and modern tooling (bun/vite).

bg-szy Skill

Create design systems with tokens, components, and documentation. Use when building design systems, creating component libraries, or establishing design tokens.

bg-szy Skill

Search for scientific papers, preprints, and publications on arXiv. Extract metadata, abstracts, and download full-text PDFs or HTML versions of papers. Use when the user asks to find research papers, literature, or specific arXiv IDs.

bg-szy Skill

React Native and Expo best practices for building performant mobile apps. Use when building React Native components, optimizing list performance, implementing animations, or working with native modules. Triggers on tasks involving React Native, Expo, mobile performance, or native platform APIs.

bg-szy Skill

Generate React components with TypeScript, proper props, hooks, and accessibility. Use when creating new React components, UI elements, or refactoring existing components.

bg-szy Skill

Build responsive layouts with CSS Grid, Flexbox, and container queries. Use when creating responsive designs, fixing layout issues, or building mobile-first layouts.

bg-szy Skill

React composition patterns that scale. Use when refactoring components with boolean prop proliferation, building flexible component libraries, or designing reusable APIs. Triggers on tasks involving compound components, render props, context providers, or component architecture. Includes React 19 API changes.

bg-szy Skill

React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.

bg-szy Skill

AI-powered spatial epigenomics analysis combining chromatin accessibility, histone modifications, and DNA methylation with spatial coordinates for tissue architecture mapping.

nota-america Skill

Design or implement responsive audio feedback for a Three.js or web game. Use for action sounds, combat layers, music states, spatial audio, mix priorities, mute controls, accessibility, mobile audio unlock, and audio performance.

nota-america Skill

Build an interactive HTML dashboard with charts, filters, and tables. Use when creating an executive overview with KPI cards, turning query results into a shareable self-contained report, building a team monitoring snapshot, or needing multiple charts with filters in one browser-openable file.

nota-america Skill

Generate developer handoff specs from a design. Use when a design is ready for engineering and needs a spec sheet covering layout, design tokens, component props, interaction states, responsive breakpoints, edge cases, and animation details.

nota-america Bundle

Creates interactive HTML playgrounds — self-contained single-file explorers that let users configure something visually through controls, see a live preview, and copy out a prompt. Use when the user asks to make a playground, explorer, or interactive tool for a topic.

nota-america Skill

Create effective data visualizations with Python (matplotlib, seaborn, plotly). Use when building charts, choosing the right chart type for a dataset, creating publication-quality figures, or applying design principles like accessibility and color theory.

nota-america Skill

Create or evaluate an architecture decision record (ADR). Use when choosing between technologies (e.g., Kafka vs SQS), documenting a design decision with trade-offs and consequences, reviewing a system design proposal, or designing a new component from requirements and constraints.

bg-szy Skill

Embed and control web content in SwiftUI apps using WebView and WebPage. Use when displaying URLs or HTML in a SwiftUI app, implementing JavaScript interop, controlling web navigation, capturing snapshots, or handling custom URL schemes. Core APIs require iOS/macOS 26+.

bg-szy Skill

UI polish, component design, animation decisions, and invisible details that make software feel great. Encodes Emil Kowalski's philosophy on design engineering. Use when the user wants to improve animation quality, polish UI interactions, or understand what makes interfaces feel "right".

bg-szy Skill

Skill for interface design (dashboards, admin panels, SaaS apps, tools) focusing on craft and consistency. Use when building product interfaces, internal tools, or complex UI systems that require intentional design decisions about hierarchy, layout, and component behavior.

bg-szy Skill

Guide for implementing smooth, native-feeling animations using React's View Transition API (`<ViewTransition>` component, `addTransitionType`, and CSS view transition pseudo-elements). Use this skill whenever the user wants to add page transitions, animate route changes, create shared element animations, animate enter/exit of components, animate list reorder, implement directional (forward/back) navigation animations, or integrate view transitions in Next.js. Also use when the user mentions view transitions, `startViewTransition`, `ViewTransition`, transition types, or asks about animating between UI states in React without third-party animation libraries.

bg-szy Bundle

Create reproducible bioinformatics analysis reports with R Markdown including code, results, and visualizations in HTML, PDF, or Word format. Use when generating analysis reports with RMarkdown.

bg-szy Bundle

Computes DNA methylation age (DNAm age) and pace of aging by applying frozen elastic-net epigenetic clocks to a clean beta matrix with methylclock, dnaMethyAge, or methylCIPHER. Covers the clock menu by question (chronological Horvath/Hannum/skin&blood; health-mortality PhenoAge/GrimAge; DunedinPACE pace; pediatric/gestational; mitotic epiTOC), age acceleration (EAA/IEAA/EEAA) as the real endpoint, the principal-component (PC) clock fix for the per-CpG reliability crisis, and EPICv2 clock-CpG dropout with missing-CpG imputation bias. Use when estimating epigenetic age, computing age acceleration, choosing a clock for an outcome, assessing clock reliability, or porting a clock to EPICv2. A clock is a frozen predictor: do not GO-enrich its CpGs and do not train it here. For cell-count adjustment (IEAA) see cell-type-deconvolution; for predictor training/validation/leakage see machine-learning/model-validation; for survival modeling of age acceleration see clinical-biostatistics/survival-analysis.

bg-szy Bundle

Analyzes genetic variant effects on gene expression (RNA-seq), chromatin accessibility (DNASE), histone marks (ChIP), and transcription factors using the AlphaGenome API. Use when the user asks about non-coding variant effects, pathogenicity, clinical significance, disease associations, functional effects, gene expression changes, splicing disruption, or regulatory effects in promoters and enhancers. Also use for resolving biological terms to tissue/cell-type ontologies (UBERON/CL) or analyzing variants in chr:pos:ref>alt format.

bg-szy Skill

Convert a light-only site or app to a real dark mode -- semantic token mapping, elevation-based surfaces, recalibrated shadows and imagery -- not a naive inversion. Handles Tailwind, CSS variables, and styled-components, plus the toggle, persistence, and no-flash boot.