Design

Enable HTTPS for local development with trusted SSL certificates. Use when developers need to test SSL/TLS features, work with third-party APIs requiring HTTPS, or simulate production environments. Supports mkcert, OpenSSL, and automatic certificate trust configuration for macOS, Linux, and Windows.

MUST be loaded before working with any Skill. Covers creating, building, reviewing, assessing, checking, auditing, evaluating, updating, modifying, and improving skills. Invoke PROACTIVELY before writing or changing any SKILL.md file. Provides structure, workflows, and validation for skill development. Supports both personal skills and standalone distributable skills (GitHub repos). (user)

Generate React components following DevPortfolio patterns with automatic scaffolding. Use when asked to create components, generate UI elements, scaffold new features, or create React components. Generates TypeScript components with proper structure, translations, tests, and animations.

Playwright best practices including selectors, wait strategies, accessibility testing, responsive design, and flaky-test prevention. Use when writing or improving Playwright E2E tests.

Assess technical, financial, operational, and organizational feasibility of learning projects including resource requirements, budget, timeline, and risk analysis. Use when evaluating project viability before committing resources. Activates on "feasibility study", "project viability", "resource planning", or "can we do this".

Especialista em design de APIs RESTful e GraphQL, documentação e boas práticas de arquitetura de APIs

Guide for creating effective skills. Use this skill when you want to create a new skill (or update an existing skill) that extends Claude's capabilities with specialized knowledge, workflows, or tool integrations.

Technical specification writing for implementation details. Use when documenting how to build a solution (post-decision), API contracts, schemas, and system design. Complements RFC skill which handles decision-making.

Analyzes stack traces, identifies log patterns, provides error solutions, and guides performance profiling, memory debugging, and distributed tracing. Use when debugging errors, analyzing logs, profiling performance, detecting memory leaks, or tracing distributed systems.

World-class data science skill for statistical modeling, experimentation, causal inference, and advanced analytics. Expertise in Python (NumPy, Pandas, Scikit-learn), R, SQL, statistical methods, A/B testing, time series, and business intelligence. Includes experiment design, feature engineering, model evaluation, and stakeholder communication. Use when designing experiments, building predictive models, performing causal analysis, or driving data-driven decisions.

Build persistent project knowledge using checkpoint/recall. Activates when fixing bugs, making decisions, or investigating past work. Creates automatic knowledge base through systematic checkpointing and semantic recall.

formative-assessment design for effective learning measurement.

PRD (Product Requirements Document) formatting skill for Linear issues. Use when creating or updating Linear issues to ensure consistent, AI-parseable structure with all required sections. Provides templates, defaults, and validation rules for issue quality.

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.

Java best practices guide based on Effective Java. Use when reviewing Java code, discussing design patterns, object creation, equals/hashCode, Optional, Stream API, exception handling, or concurrency. Applies Joshua Bloch's principles.

Эксперт по quick start гайдам. Используй для создания быстрых руководств, getting started документации и onboarding материалов.

Use when designing inclusive animations, addressing vestibular disorders and motion sensitivity, or ensuring animation accessibility compliance.

Generates detailed, step-by-step implementation plans for React/Next.js components based on component lists from plan-based-components and optional UI design images. Creates actionable task lists with file paths, dependencies, implementation details, and verification checklists. Use when users want specific implementation guidance for building components.

Browser automation and end-to-end testing. Use when user wants to test web applications, automate browser interactions, scrape web content, or verify UI functionality across browsers.

Systematic code review guidelines and checklist. Use this skill when reviewing code, conducting pull request reviews, or establishing code quality standards. Provides comprehensive review criteria covering functionality, design, testing, security, and documentation. Complements the code-quality agent.