Development

Embedded systems development best practices for ESP32, FreeRTOS, and ESP-IDF. Use when writing firmware code, reviewing implementations, or learning about embedded patterns.

Generate AI-powered podcast-style audio narratives using Azure OpenAI's GPT Realtime Mini model via WebSocket. Use when building text-to-speech features, audio narrative generation, podcast creation from content, or integrating with Azure OpenAI Realtime API for real audio output. Covers full-stack implementation from React frontend to Python FastAPI backend with WebSocket streaming.

Use when writing E2E tests with Playwright, setting up test infrastructure, or debugging flaky browser tests. Invoke for browser automation, E2E tests, Page Object Model, test flakiness, visual testing.

Review unread email, categorize it, and draft replies (no sending without approval)

Integrate email services with backends using SMTP, third-party providers, templates, and asynchronous sending. Use when implementing email functionality, sending transactional emails, and managing email workflows.

Expert guide for sending transactional emails, creating templates, scheduling notifications, and email best practices. Use when implementing email functionality, notifications, or campaigns.

Implement email functionality using FastAPI-Mail for password reset, notifications, and transactional emails. Use when setting up email services or notification systems.

Generate bulletproof HTML email code that renders correctly across Gmail, Outlook, Apple Mail, Yahoo, and mobile clients. Use when creating HTML emails, email templates, or any HTML content for email delivery. Handles table-based layouts, inline CSS, MSO conditionals, and cross-client compatibility.

Analyze email messages and mailbox data for forensic investigation. Use when investigating phishing attacks, business email compromise, insider threats, or any scenario requiring email evidence analysis. Supports PST, OST, MBOX, EML, and MSG formats.

Email template development with React Email and Tailwind CSS. Use when creating or modifying email templates, testing email rendering, or building email HTML from React components.

Componentes de UI para geração e visualização de e-mails seguindo o padrão de components do Easy Budget.

Emacs ecosystem = elisp + org + gnus + tramp + eglot.

Use when working with Emacs org-mode - provides elisp patterns for headings, properties, tables, links, and org-mode manipulation

This skill should be used when the user asks to "write elisp", "emacs config", "init.el", "use-package", ".el file", "emacs lisp", or "magit". Provides comprehensive Emacs ecosystem patterns and best practices. For org-mode, use org-ecosystem skill.

Expert guidance for ElysiaJS web framework development. Use when building REST APIs, GraphQL services, or WebSocket applications with Elysia on Bun. Covers routing, lifecycle hooks, TypeBox validation, Eden type-safe clients, authentication with JWT/Bearer, all official plugins (OpenAPI, CORS, JWT, static, cron, GraphQL, tRPC), testing patterns, and production deployment. Assumes bun-expert skill is active for Bun runtime expertise.

Implements Elon Musk's algorithm for efficiency to streamline development processes. This rule emphasizes critical questioning, simplification, optimization, acceleration, and automation.

Use when designing distributed systems, decomposing monoliths, or implementing microservices patterns. Invoke for service boundaries, DDD, saga patterns, event sourcing, service mesh, distributed tracing.

Use when creating or modifying email templates for Elon AI - welcome emails, role changes, notifications, teacher digests, or QR code invitations. This project uses HTML string templates, NOT React Email components.

```markdown 1: --- 2: name: elo-rating-systems 3: description: Explains the implementation of Elo rating systems, including the unified BaseEloRating interface, core formulas, sport-specific parameters (K-factor, home advantage), and update logic. 4: version: 2.1.0 5: --- 6: 7: # Elo Rating Systems 8: 9: ## ✅ Unified Interface (BaseEloRating) - COMPLETED **Status**: All 9 sport-specific Elo implementations have been successfully refactored to inherit from `BaseEloRating`. 10: 11: All sport-sp...

Elna Company MPN encoding patterns, suffix decoding, and handler guidance. Use when working with Elna audio-grade aluminum electrolytic capacitors and supercapacitors.

Specialized Elm-to-F# migration expert for morphir-dotnet. Expert in converting Elm code from finos/morphir-elm to idiomatic F# while maintaining AOT compatibility, type safety, and behavioral equivalence. Use when migrating Elm modules, converting patterns, implementing Myriad code generation, or translating UI code to Fun.Blazor. Triggers include "elm", "migration", "convert elm", "translate elm", "morphir-elm", "myriad", "fun.blazor", "elm architecture".

Comprehensive Elm functional programming for web development including The Elm Architecture, type system, JavaScript interop, and production-ready patterns

Nix environment patterns for Ellie's projects. Use when (1) a tool or command is not available on the system, or (2) setting up a new project that needs a development environment. Provides patterns for ad-hoc tool execution and flake-based devShells with direnv.

Frontend development standards for Ellie's projects. Use when building frontend interfaces, components, pages, or applications. Enforces tech stack preferences (Leptos > HTMX/SolidJS > React, modern vanilla CSS, no Tailwind) and accessibility-first development. Always apply these standards unless they conflict with an existing project's established patterns.