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Found 9,230 Skills
Fix PageSpeed Insights/Lighthouse accessibility "!" errors caused by contrast audit failures (CSS filters, OKLCH/OKLAB, low opacity, gradient text, image backgrounds). Use for accessibility-driven SEO/performance debugging and remediation.
Use when reviewing code security, auditing dependencies for CVEs, checking configuration or secret security, assessing authentication and authorization patterns, identifying OWASP vulnerabilities (injection, XSS, CSRF), or addressing security concerns about implementations.
Make application behavior visible to coding agents by exposing structured logs and telemetry. Use when asked to "add telemetry", "make logs accessible to agents", "add observability", "debug with logs", or when an agent needs to understand runtime behavior but has no way to query logs. Also use when debugging is difficult because there are no structured logs, when agent docs (CLAUDE.md, AGENTS.md) lack instructions for querying application logs, or when setting up logging infrastructure for a new or existing web application.
Ember.js performance optimization and accessibility guidelines. This skill should be used when writing, reviewing, or refactoring Ember.js code to ensure optimal performance patterns and accessibility. Triggers on tasks involving Ember components, routes, data fetching, bundle optimization, or accessibility improvements.
Used to audit codebases to ensure their naming complies with established terminology and specifications. This Skill should be used when you need to enforce a project's 'Ubiquitous Language', identify deviations in method/variable/parameter naming, and propose modification suggestions.
Inline risk classification for agent tasks using a 4-tier model. Hybrid routing: GREEN/YELLOW use heuristic file-pattern matching, RED/CRITICAL escalate to war-room-checkpoint for full reversibility scoring.
Design and build professional HTML email templates with inline CSS for broad email client compatibility. Use this skill when the user asks to create, design, or build email templates, newsletters, transactional emails (order confirmations, receipts, shipping notifications, password resets), marketing emails, welcome series, onboarding emails, abandoned cart emails, drip campaigns, or any HTML email layout. Covers responsive design, dark mode support, and compatibility with Gmail, Outlook (desktop + web), Apple Mail, Yahoo, and mobile clients.
Provides high-performance WPF rendering techniques including DrawingVisual, WriteableBitmap, CompositionTarget.Rendering, and BitmapCache. Use when implementing real-time graphics, game loops, particle systems, charts, or when Shape controls cause performance issues.
Expert 10x engineer with comprehensive knowledge of web development, internet protocols, and web standards. Use when working with HTML, CSS, JavaScript, web APIs, HTTP/HTTPS, web security, performance optimization, accessibility, or any web/internet concepts. Specializes in translating web terminology accurately and implementing modern web standards across frontend and backend development.
Stripe, RevenueCat, subscription billing, webhooks, PCI compliance, and tax
Use when helping with the Splitwise CLI (splitwisecli) — splitting bills, tracking shared expenses between friends, recording expenses, settling debts, or checking balances. Use for 'Splitwise', 'split receipts', 'split bills', 'who owes whom', 'expense tracking', 'splitwisecli', 'divide costs', or 'settle up'.
Operate long-lived agent workloads with observability, security boundaries, and lifecycle management.