Backend

Manages file storage with AWS S3 using the JavaScript SDK v3. Use when uploading files, generating presigned URLs, managing buckets, or implementing cloud storage in Node.js applications.

Enterprise Backend-as-a-Service Foundation with AI-powered BaaS architecture patterns, strategic provider selection, and intelligent multi-service orchestration for scalable production applications

This skill is used to turn Android app ideas into small, well-bounded product slices with clear value, ready for UX and implementation.

Generate CI/CD pipelines for Node.js and Angular applications on GCP with Cloud Build and GKE deployment. Use when creating or updating deployment pipelines for Node.js services, Express APIs, NestJS applications, or Angular frontends targeting Google Cloud Platform.

This skill should be used when creating token-efficient hook systems and MCP server architectures for web applications. Use for React/FastAPI, Django, Node.js projects that need smart caching, progressive context loading, and 95%+ token reduction. Essential for projects requiring monitoring, debugging, data analysis, and system health tools.

Senior Go developer for concurrent, cloud-native systems. Use for Go 1.21+ with goroutines, channels, gRPC, and performance optimization.

Implement comprehensive input validation on both client and server sides, using allowlists over blocklists, sanitizing user input, and providing specific error messages to prevent security vulnerabilities. Use this skill when writing validation logic for forms, API endpoints, function parameters, or any user input. Use this skill when implementing server-side validation to ensure data integrity and security, adding client-side validation for immediate user feedback, or sanitizing input to prevent injection attacks. Use this skill when working with form components, API route handlers, data processing functions, or validation schemas. Use this skill when defining validation rules for data types, formats, ranges, required fields, or business logic constraints across all application entry points.

Automatically applies when creating FastAPI endpoints, routers, and API structures. Enforces best practices for endpoint definitions, dependency injection, error handling, and documentation.

Analyze and visualize state flow in LangGraph pipelines. Use when debugging state mutations, tracing data flow between nodes, identifying orphan state keys, detecting read/write dependencies, or generating Mermaid diagrams of state transitions. Triggers on phrases like "visualize state flow", "trace state key", "which nodes touch X", "state dependencies", "debug state mutation", "orphan state keys", "state flow diagram".

Parse Figma design files into structured screen hierarchies. Use when working with Figma API, extracting text/labels from design nodes, traversing node trees, detecting cover frames, or parsing screen IDs (AUTO_0001, PSET_0002, etc.).

This skill should be used when the user asks "what plugins are available", "list dev tools", "what MCP servers can I use", "enable code intelligence", or needs to discover available development plugins like serena, context7, or playwright.

Datti APIバックエンド開発ガイド。Go製PostgreSQL APIサーバーの開発、新機能実装、テスト、デプロイに関する標準フロー。契約定義、スキーマ設計、ユースケース実装時に自動的に使用。

Validate code examples across the 4-Layer Teaching Method with intelligent strategy selection.Use when validating Python/Node/Rust code in book chapters. NOT for production deployment testing.

Gym/gymnasium API - custom environments, spaces, wrappers, vectorization, debugging

Engage in rigorous intellectual scrutiny of ideas and reasoning through systematic challenge and questioning. Use this skill when explicitly asked to critique, challenge, or rigorously analyze ideas, arguments, proposals, or reasoning. Apply when the user requests critical analysis, wants their assumptions questioned, or asks for intellectually honest feedback that prioritizes truth over comfort.

Design and implement RESTful API endpoints with proper HTTP methods, status codes, and consistent naming conventions. Use this skill when creating or modifying API routes, endpoints, or server-side request handlers. When working on files in src/pages/api/, files containing API route definitions, files implementing REST endpoints, files handling HTTP requests and responses, server middleware for API requests, API authentication and authorization logic, and files defining API versioning strategies. When designing URL structures for resources, implementing query parameter handling for filtering/sorting/pagination, setting up rate limiting for API endpoints, or configuring CORS and API security headers.

Configure treemap charts in drizzle-cube dashboards for hierarchical data visualization. Use when creating treemaps, hierarchical visualizations, or nested proportions.

Kickstart and maintain a fast-paced fiction project from a thumbnail using Harmon Story Circle + Crouch-style chapter momentum. Use when the user asks for help writing a story/novel, wants beat sheets, chapter plans, Blake Crouch pacing, or wants canon/timeline guardrails for high-concept sci-fi/fantasy.

Define database models and schemas with proper naming, data types, constraints, relationships, and indexing strategies. Use this skill when creating or modifying database models, entity definitions, or schema files. When working on files like models.py, models/*.ts, entities/*.ts, schema.prisma, or ORM model definitions. When defining table structures, setting up foreign key relationships, adding database constraints (NOT NULL, UNIQUE), choosing appropriate data types, or implementing model-level validation.

Create 2D and 3D maps using ArcGIS Maps SDK for JavaScript. Use for initializing maps, scenes, views, and navigation. Supports both Map Components (web components) and Core API approaches.