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Found 1,677 Skills
Mobile app development guide for cross-platform apps. Covers React Native, Flutter, and Expo frameworks. Use proactively when user wants to build mobile apps or convert web apps to mobile. Triggers: mobile app, React Native, Flutter, Expo, iOS, Android, 모바일 앱, モバイルアプリ, 移动应用, aplicación móvil, app móvil, desarrollo móvil, application mobile, développement mobile, mobile Anwendung, mobile App, mobile Entwicklung, applicazione mobile, app mobile, sviluppo mobile Do NOT use for: web-only projects, backend-only development, or desktop apps.
Tests web applications for Cross-Site Scripting (XSS) vulnerabilities by injecting JavaScript payloads into reflected, stored, and DOM-based contexts to demonstrate client-side code execution, session hijacking, and user impersonation. The tester identifies all injection points and output contexts, crafts context-appropriate payloads, and bypasses sanitization and CSP protections. Activates for requests involving XSS testing, cross-site scripting assessment, client-side injection testing, or JavaScript injection vulnerability testing.
Expert in cross-platform mobile development (React Native/Flutter), bridging native performance with shared business logic.
Captures executable contracts and coding knowledge into .trellis/spec/ documents after implementation, debugging, or design decisions. Enforces code-spec depth for infra and cross-layer changes with mandatory sections for signatures, contracts, validation matrices, and test points. Use when a feature is implemented, a bug is fixed, a design decision is made, a new pattern is discovered, or cross-layer contracts change.
Intelligent loading performance analysis with automated workflows for TTFB investigation (DNS/connection/server breakdown), render-blocking detection, script performance deep dive (first vs third-party attribution), font optimization, and resource hints validation. Includes decision trees that automatically analyze TTFB sub-parts when slow, detect script loading anti-patterns (async/defer/preload conflicts), identify render-blocking resources, and validate resource hints usage. Features workflows for complete loading audit (6 phases), backend performance investigation, and priority optimization. Cross-skill integration with Core Web Vitals (LCP resource loading), Interaction (script execution blocking), and Media (lazy loading strategy). Use when the user asks about TTFB, FCP, render-blocking, slow loading, font performance, script optimization, or resource hints. Compatible with Chrome DevTools MCP.
Configure private networks, WireGuard VPN gateways, internet gateways, and virtual cross connects. This skill provides Go SDK examples.
Convert video clips to optimized GIFs with speed control, cropping, text overlays, and file size optimization. Create perfect GIFs for social media, documentation, and presentations.
Postmark platform help — transactional email delivery via REST API (`POST /email`, `POST /email/batch`), SMTP relay, Message Streams (transactional vs broadcast isolation), Handlebars Templates with layout inheritance, Inbound Email parsing, Webhooks (bounce, delivery, open, click, spam complaint, subscription change, inbound), DMARC Monitoring, Bounce Management (Rebound), Suppressions, Statistics, Bulk API, Sender Signatures, and domain authentication. Use when asking 'how do I do X in Postmark', sending transactional email with Postmark, configuring Message Streams, setting up Postmark templates, processing inbound email via Postmark, managing bounces and suppressions, or troubleshooting Postmark deliverability. Do NOT use for general email marketing strategy (use /sales-email-marketing), cross-platform email deliverability (use /sales-deliverability), email open/click tracking strategy (use /sales-email-tracking), or SendGrid-specific questions (use /sales-sendgrid).
Fetch structured stock sentiment across Reddit, X.com, news, and Polymarket using the Adanos Finance API. Use this skill whenever the user asks how much people are talking about a stock, how hot a ticker is on social platforms, how many Polymarket bets exist for a company, whether sources are aligned, or to compare stock sentiment across multiple tickers. Triggers include: "social sentiment on TSLA", "how hot is NVDA on X.com", "how many Reddit mentions does AAPL have", "compare sentiment on AMD vs NVDA", "how many Polymarket bets on Microsoft", "is Reddit aligned with X on META", "stock buzz", "bullish percentage", and any mention of cross-source stock sentiment research. This skill is READ-ONLY and does not place trades or modify anything.
Navigate, manage, and optimize monorepos with Turborepo, Nx, pnpm workspaces, and Changesets. Covers cross-package impact analysis, selective builds, dependency graph visualization, remote caching, migration from multi-repo, and coordinated publishing. Use when working in monorepos, optimizing build times, or managing shared packages.
Kit (formerly ConvertKit) platform help — email marketing, visual automations, sequences, landing pages, forms, Creator Profile, Commerce (digital products, paid newsletters), Creator Recommendations, subscriber tagging and segmentation, engagement scoring, API. Use when asking 'how do I do X in Kit', 'how do I do X in ConvertKit', configuring Kit settings, setting up automations, managing subscribers, selling digital products, or using the Kit API. Do NOT use for cross-platform email marketing strategy (use /sales-email-marketing), cross-platform deliverability (use /sales-deliverability), funnel strategy (use /sales-funnel), newsletter monetization strategy (use /sales-newsletter), audience growth strategy (use /sales-audience-growth), or digital product strategy (use /sales-digital-products).
Comprehensive validation patterns for ASP.NET Core applications. Covers FluentValidation integration, DataAnnotations, IValidatableObject, IValidateOptions<T>, MediatR pipeline behavior, and client-side validation. Use when implementing validation in ASP.NET Core applications, setting up FluentValidation, creating custom validators, configuring options validation, or implementing cross-field validation.