Backend

Sends emails from Node.js applications using SMTP or other transports with Nodemailer. Use when implementing email functionality with full control over transport configuration.

Supadata API via curl. Use this skill to extract transcripts from YouTube/TikTok/Instagram videos and scrape web content to markdown.

Master reward function design - potential-based shaping, hacking patterns, validation

Use profunctor optics from the Collimator library for Lean 4. Use when working with lenses, prisms, traversals, or nested data access.

Rust/Actix-web patterns, error handling, auth middleware, and repository patterns for T2 backend. Use when implementing backend endpoints, handlers, or services.

MERN stack patterns including React with Vite, Express middleware, MongoDB schemas, API Gateway architecture, session management, error handling, and testing strategies. Activate for MERN development, microservices architecture, and full-stack JavaScript applications.

OpenAI API, embeddings, completions, prompt engineering

Path-grounded multi-agent orchestration using the Liku directory hierarchy (skills.xml inheritance, todo.md + LikuErrors.md audit trail, SQLite memory). Use when you need to initialize Liku, generate an agent bundle for a specific Liku/* residence path, or expose Liku as an MCP server for Gemini-CLI, Claude Code, Copilot-CLI, or ChatGPT Codex.

Claude Code skill for image generation using Gemini 3 Pro Image API

Infer gene regulatory networks (GRNs) from gene expression data using scalable algorithms (GRNBoost2, GENIE3). Use when analyzing transcriptomics data (bulk RNA-seq, single-cell RNA-seq) to identify transcription factor-target gene relationships and regulatory interactions. Supports distributed computation for large-scale datasets.

Allra 백엔드 API 설계 및 패키지 구조 규칙. Use when creating REST APIs, DTOs, or organizing backend code structure.

gRPC integration patterns for ABP microservices including service implementation, client generation, multi-tenancy, and error handling. Use when: (1) implementing inter-service communication, (2) creating gRPC service endpoints, (3) consuming gRPC clients in AppServices, (4) designing high-performance APIs.

"How do I deliver maximum value with minimum cost?" - The capability of finding optimal paths to insight. Not restriction, but excellence at efficiency. Use when (1) spawning as opus-distillatus agent for focused synthesis, (2) token budget matters and quality cannot suffer, (3) working on tasks where the process itself is valuable and will be examined, (4) combining multiple sources into crystallized insight. This is an IDENTITY skill - it describes what you're excellent at, not what you can't do. Trust your judgment to find where tokens create value.

Production Fastify (TypeScript) patterns: schema validation, plugins, typed routes, error handling, security hardening, logging, testing with inject, and graceful shutdown

EKS cluster patterns and best practices for Terraform. Provides cluster, node group, add-on, and IRSA scaffolds. Use when developing EKS infrastructure.

Production validation specialist ensuring applications are fully implemented and deployment-ready. Use to verify no mock/stub/fake implementations remain, validate against real databases and APIs, perform end-to-end testing with actual systems, and confirm production readiness.

Token-efficient codebase navigation through intelligent symbol loading and querying. Use this skill when implementing new features (find existing patterns), exploring codebase structure, searching for components/functions/types, or understanding architectural layers. Reduces token usage by 60-95% compared to loading full files. Layer split enables 50-80% additional backend efficiency.

Automate web browser interactions using natural language via CLI commands. Use when the user asks to browse websites, navigate web pages, extract data from websites, take screenshots, fill forms, click buttons, interact with web applications, monitor network requests, debug web pages, or extract design tokens. Triggers include "browse", "navigate to", "go to website", "open webpage", "extract data from webpage", "screenshot", "web scraping", "fill out form", "click on", "search for on the web", "check network requests", "debug page", "get design tokens", "extract colors", "analyze website design". When taking actions be as specific as possible.

Look up GDScript and Godot Engine documentation using Deepwiki and Context7.Use when you need to find implementation approaches, APIs, or code examples for Godot projects.

WHEN: Spring Boot code review, DI patterns, @Transactional, REST API design, security configuration WHAT: Dependency injection + Transaction management + API design + Security config + JPA patterns WHEN NOT: Kotlin Spring → kotlin-spring-reviewer, Pure Java → java-reviewer, Django/FastAPI → respective reviewers