Backend

Use when naming classes, methods, routes in vanilla Rails codebases - fixes concern verb/noun confusion, bang method misuse, custom action anti-patterns

Create API handoff documentation for frontend developers. Use when backend work is complete and needs to be documented for frontend integration, or user says 'create handoff', 'document API', 'frontend handoff', or 'API documentation'.

Robotics safety validation checklist for reviewing robot code and configurations. Use when reviewing URDF files, ROS 2 nodes, or any robotics content for safety issues.

Use this skill when working on rpg-api codebase - provides layered architecture patterns, outside-in development, and integration with rpg-toolkit

Install a default set of commonly used libraries when initializing a new TypeScript Node.js project (or retrofitting an existing one). Use when a user asks to "create a TypeScript project" and wants the standard dependencies installed (p-map, p-retry, luxon, lodash-es, winston, prisma + @prisma/client, ioredis, express, dotenv) plus common tooling (rimraf, tsc-alias) with optional @types packages and Prisma init.

This skill provides comprehensive guidelines for Django backend development following best practices. Expert guidance for Django development including models, views, templates, and best practices. Use when building Django applications, debugging Django issues, or implementing Django features.

Repository-specific guardrails and verification steps for CoinTrader-AI. Use when changing code, content, routes, affiliate/analytics logic, or environment/configuration in this repo.

Work effectively with Lean 4 quotients in ComputationalPaths (Quot.lift/Quot.ind/Quot.sound), including nested lifts and common proof obligations.

Auditar conexões R2DBC MySQL, tunar pools reativos e validar binding de secrets via Azure Key Vault/Swarm para o backend de resultados.

Embedding backends (InsightFace/PyTorch+ONNXRuntime vs TensorRT). Use when optimizing embedding throughput or debugging drift/fallbacks.

Creates a battle-tested ChatGPT-style chatbot widget that solves real-world production issues. Features infinite re-render protection, text selection "Ask AI", RAG backend integration, streaming SSE, and comprehensive performance monitoring.

Project planning and architecture decision workflow for Java/Spring. Use when starting new projects, designing microservices, or making architectural decisions. Emphasizes simplicity, Spring-based robustness, and observability.

Create, validate, and package Claude skills automatically. Use PROACTIVELY when users want to create a new skill, validate existing skill files, or package skills for distribution. Works across Claude.ai, API, and Claude Code platforms.

Help with Rails testing including unit tests, integration tests, fixtures, and debugging test failures. Use when working on tests or debugging test issues.

Modern Python development with uv, FastAPI, Pydantic, and clean architecture. Use for Python project setup, LLM app development, API design, testing strategy, and architecture decisions. Ideal for TypeScript developers transitioning to Python.

Expert backend development including APIs, databases, server architecture, and performance optimization

Commander.js CLI framework patterns including Command class, options, arguments, nested subcommands, and Option class usage. Use when building Node.js CLIs, implementing Commander.js commands, creating TypeScript CLI tools, adding command options/arguments, or when user mentions Commander.js, CLI commands, command options, or nested subcommands.

Read files from remote storage backends (local, FTP, SFTP, S3, Azure). List directories, download files, inspect metadata. Use for reading data from cloud storage, FTP servers, or remote filesystems without making changes.

Initialize Python project structure with proper directory layout, configuration files, and best practices. Use when creating new projects or restructuring existing ones.

Activates automatically when designing or implementing Cloudflare Workers APIs,orchestrating multi-provider API calls, implementing D1 database operations,or managing KV-based caching strategies.Ensures proper error handling, provider tagging, fallback chains, andorchestration patterns for BooksTrack backend infrastructure.Auto-activates on:- File patterns: *.worker.js, *-api.ts, *-service.ts in backend code- Keywords: "api orchestration", "multi-provider", "fallback chain", "D1 query"- Context: Cloudflare Workers development, API design discussions