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Ruby on Rails testing best practices for writing effective, maintainable test suites with RSpec. This skill should be used when writing, reviewing, or…

Converts any Claude Code skills repository into an official plugin marketplace. Analyzes existing skills, generates .claude-plugin/marketplace.json conforming to the Anthropic spec, validates with `claude plugin validate`, tests real installation, and creates a PR to the upstream repo. Encodes hard-won anti-patterns from real marketplace development (schema traps, version semantics, description pitfalls). Use when the user mentions: marketplace, plugin support, one-click install, marketplace.json, plugin distribution, auto-update, or wants a skills repo installable via `claude plugin install`. Also trigger when the user has a skills repo and asks about packaging, distribution, or making it installable.

Use when creating motion that needs dimensional grounding, designing transforms that maintain object integrity, or ensuring animations feel structurally sound.

Use when implementing animations in code, building UI transitions, or when a developer needs practical animation guidance for web/mobile applications.

Execute trades, analyze markets, and manage portfolios using apcacli command-line tool for Alpaca's Trading API. Use when the user wants to trade stocks, ETFs,…

Evolution API integration for WhatsApp messaging, instance management, webhooks, and chatbot orchestration. Use when: (1) Creating or managing WhatsApp instances via Evolution API, (2) Sending messages (text, media, audio, lists, buttons, reactions), (3) Configuring webhooks or event listeners, (4) Managing groups or contacts, (5) Integrating with Typebot, Chatwoot, Dify, or OpenAI through Evolution API. Triggers on: evolution-api, evolution api, whatsapp api, baileys, whatsapp integration, send whatsapp, whatsapp webhook.

Improve decision quality by clarifying the real problem, exposing hidden assumptions, reasoning from fundamental facts, reducing unnecessary complexity, and…

Integrate Base Builder Codes (ERC-8021) into web3 applications for onchain transaction attribution and referral fee earning. Use when a project needs to append…

Fix a Dependabot PR by updating all monorepo instances of the dependency, running bun install, and pushing

Builds multi-step forms with validation schemas (Zod/Yup), step components, shared state management, progress indicators, review steps, and error handling. Use…

Expert in browser automation using Chrome DevTools Protocol (CDP) and WebDriver. Specializes in secure web automation, testing, and scraping with proper…

Design optimized database schemas for SQL and NoSQL databases including tables, relationships, indexes, and constraints. Creates ERD diagrams, migration…

A/B test subject line variations using proven copywriting frameworks. Predict open rates based on historical performance.

Generate wrapper interfaces and DI registration for hard-to-test static dependencies in C#. Produces IFileSystem, IEnvironmentProvider, IConsole, IProcessRunner wrappers, or guides adoption of TimeProvider and IHttpClientFactory. USE FOR: generate wrapper for static, create IFileSystem wrapper, wrap DateTime.Now, make static testable, make class testable, create abstraction for File.*, generate DI registration, TimeProvider adoption, IHttpClientFactory setup, testability wrapper, mock-friendly interface, mock time in tests, create the right abstraction to mock, how to mock DateTime, test code using File.ReadAllText, what abstraction for Environment, how to make statics injectable, adopt System.IO.Abstractions, make file calls testable. DO NOT USE FOR: detecting statics (use detect-static-dependencies), migrating call sites (use migrate-static-to-wrapper), general interface design not about testability.

Analyze existing repositories, maintain structure, setup guardrails and best practices

Integrate financial planning engines with the advisor technology stack, covering goal-based frameworks, Monte Carlo simulation, plan-to-portfolio linkage, and…

Modern React development with hooks, component patterns, state management, and performance optimization for building scalable applications

Runs existing test suite to catch regressions after implementation changes. Use when Story needs regression verification. No status changes.

Plan and execute product launches with week-by-week timelines and channel-specific playbooks. Use when the user asks about launching a product, Product Hunt…

Design and manage market data infrastructure — real-time and delayed feeds, Level 1/2/3 depth, consolidated tape vs direct feeds, vendor selection, licensing,…