Backend

Implement error-as-value pattern in Java using Result type for type-safe error handling. Use this skill when implementing error handling without exceptions, converting try-catch to Result pattern, or designing type-safe error handling in Java applications. Particularly useful for functional programming style, API design, and when errors are expected and recoverable.

Expert in 2000s-era music visualization (Milkdrop, AVS, Geiss) and modern WebGL implementations. Specializes in Butterchurn integration, Web Audio API AnalyserNode FFT data, GLSL shaders for audio-reactive visuals, and psychedelic generative art. Activate on "Milkdrop", "music visualization", "WebGL visualizer", "Butterchurn", "audio reactive", "FFT visualization", "spectrum analyzer". NOT for simple bar charts/waveforms (use basic canvas), video editing, or non-audio visuals.

Automatically helps debug Web Audio API issues, audio playback problems, pitch preservation, and caching issues in the VSSK-shadecn music practice app

Use when working with Ruby's standard library including Enumerable, File I/O, Time/Date, Regular Expressions, and core classes.

Generate Django REST Framework serializers with validation, nested relationships, and best practices. Use when creating or updating API serializers, especially for complex models with relationships.

Celery configuration templates for all frameworks (Django, Flask, FastAPI, standalone). Use when configuring Celery, setting up task queues, creating Celery apps, integrating with frameworks, or when user mentions Celery configuration, task queue setup, broker configuration, or framework integration.

Design innovative game mechanics using web browser APIs that create "WOW moments" impossible in other platforms. Implements 5 surprise types (rule-breaking, meta-awareness, recursive-explosion, hidden-layer, system-hacking) using LocalStorage, Canvas, Notifications, DevTools, and browser tab manipulation. Use when creating surprising game mechanics, implementing meta-game elements, or designing memorable interactive moments for web games.

Deploy the Light Bot application to the staging server using SSH and Docker Compose.

Web search and content extraction via Brave Search API.

Reference for Guardrails library with Malli in Clojure. Use when working with `>defn`, `>defn-`, `>def`, `>fdef` macros, gspec syntax, or function validation. Triggers on guardrails imports, `com.fulcrologic.guardrails.malli`, function specs with `=>` operator, or questions about runtime validation in Clojure.

Network configuration for Bazzite. iwd WiFi backend, Wake-on-LAN, and Tailscale VPN.Use when users need to configure network services. For SSH, see bazzite-ai:configure.

Production-ready code templates for Kailash SDK including basic workflows, cyclic workflows, custom nodes, MCP servers, and all three test tiers (unit, integration, end-to-end). Use when asking about 'template', 'example code', 'starter code', 'boilerplate', 'scaffold', 'workflow template', 'custom node template', 'MCP server template', 'test template', 'unit test template', 'integration test template', or 'E2E test template'.

Advanced TypeScript type patterns including generics, type guards, and branded types. Use when designing type-safe APIs.

Python Flask environment setup for beginners

Docker Compose management for orchestrating MCP servers and multi-container applications. Use when deploying MCP servers, managing container lifecycles, or configuring service dependencies.

Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers. Use when designing new APIs, reviewing API specifications, or establishing API design standards.

Build async APIs with FastAPI, including endpoints, dependency injection, validation, and testing. Use when creating REST APIs, web backends, or microservices.

Expert en développement backend - APIs, bases de données, architecture, sécurité et performance

Search the web using GPT-5.2 and OpenAI's Responses API with web_search tool. Use when the user wants to fetch real-time information from the internet via terminal/CLI using OpenAI's API.

This skill should be used when the user asks to "convert asyncpg to SQLAlchemy", "convert database queries", "migrate asyncpg code", "transform asyncpg patterns to SQLAlchemy", or "update FastAPI database layer". It provides systematic conversion of asyncpg code to SQLAlchemy async patterns with proper error handling and transaction management.