Design

Probability, distributions, hypothesis testing, and statistical inference. Use for A/B testing, experimental design, or statistical validation.

Expert product management guidance for product strategy, roadmap planning, feature prioritization, user research, requirements gathering, metrics, and go-to-market strategy. Use when discussing product vision, features, user needs, roadmaps, or product decisions.

Expert technical analyst for comprehensive codebase analysis and strategic implementation planning. Use when planning features, designing architecture, analyzing complex tasks, or when you need a detailed plan.md before implementation.

Build robust backend systems with modern technologies (Node.js, Python, Go, Rust), frameworks (NestJS, FastAPI, Django), databases (PostgreSQL, MongoDB, Redis), APIs (REST, GraphQL, gRPC), authentication (OAuth 2.1, JWT), testing strategies, security best practices (OWASP Top 10), performance optimization, scalability patterns (microservices, caching, sharding), DevOps practices (Docker, Kubernetes, CI/CD), and monitoring. Use when designing APIs, implementing authentication, optimizing database queries, setting up CI/CD pipelines, handling security vulnerabilities, building microservices, or developing production-ready backend systems.

Design and implement RESTful API endpoints following REST principles with clear resource-based URLs and appropriate HTTP methods. Use this skill when creating API routes, defining API endpoints, implementing HTTP request handlers, working on route files (routes.ts, route.ts, api/*, controllers/*, handlers/*), building REST APIs, designing API versioning strategies, setting up query parameters for filtering and pagination, implementing rate limiting, or returning appropriate HTTP status codes. Apply this skill when structuring backend API architecture, creating new API endpoints, refactoring existing endpoints, or reviewing API design for consistency and best practices.

Эксперт Android notifications. Используй для push notifications, channels и notification patterns.

Guide PRD document creation using the standard template. PRD contains REQUIREMENTS ONLY - no user stories (those are extracted separately). Use when EA agent drafts or updates a PRD, or when validating PRD structure.

Complete TDD workflow for creating comprehensive failing test suites across all architectural layers (entities, use cases, services, APIs, E2E) using Vitest, Playwright, and Testing Library. Mandatory Context7 consultation for latest testing patterns.

Guide for using MCPKit Swift package to build MCP (Model Context Protocol) tool servers. Use when creating new MCP servers, defining tools, or integrating MCP into Swift projects.

Guide for creating, configuring, and distributing Claude Code plugins with hooks, skills, commands, and MCP servers. Use when user asks to create a plugin, set up hooks, add plugin functionality, create a marketplace, or distribute custom Claude Code extensions.

Use when investigating test suite issues, reducing CI/CD time, identifying brittle tests, finding test duplication, or analyzing test maintenance burden - reveals test code quality problems through git history analysis

Social return on investment (SROI) modeling, blended finance structuring, and impact-weighted accounting. Use for evaluating social enterprises, impact investments, ESG integration, sustainability metrics, and theory of change financial modeling. Generates comprehensive impact assessments that blend financial returns with social and environmental outcomes, suitable for impact investors, foundations, and mission-driven organizations.

Quick reference for Smithery and Cloudflare deployment operations. Use for deploying Canvas MCP server, managing workers on ariff.dev, and testing OAuth endpoints.

Translate Figma designs into production code with 1:1 visual parity. Use when user mentions Figma files, design handoff, or UI implementation from designs.

Implement and deserialize all CQL types including primitives (int, text, timestamp, uuid, varint, decimal), collections (list, set, map), tuples, UDTs (user-defined types), and frozen types. Use when working with CQL type deserialization, schema validation, collection parsing, UDT handling, or type-correct data generation.

Standards, architecture patterns, and best practices for Android app development with Kotlin, Jetpack Compose, and Android Jetpack libraries using clean architecture and MVVM. Use for any Android coding, review, refactor, or design task, especially when acting as an AI coding agent that must follow established project conventions.

Create warm, nature-themed UI for Grove with glassmorphism, seasonal decorations, randomized forests, and accessible design patterns. Use when building pages, enhancing UI, or adding decorative elements.

Master modern frontend development, UI/UX design principles, responsive design, component architecture, and design systems. Includes HTML, CSS, JavaScript, TypeScript, React, Next.js, Vue, Angular, React Native, and UX/Design system fundamentals.

Complete Test-Driven Development workflow coordinating RED → GREEN → REFACTOR → COMMIT cycle with requirement traceability. Use this when implementing a requirement (REQ-*) or adding new functionality.

Applies Sentient.io's official brand colors, typography, and logo standards to product marketing materials including brochures, landing pages, presentations, and digital assets. Use when creating any Sentient.io branded content.