Backend

Transform skill drafts into clear methodology through phased refinement that applies only what each skill needs. Use when: (1) after generating an initial skill draft, (2) reviewing a skill that reads as items rather than thinking, (3) before finalizing a skill for inclusion in a plugin, (4) after feedback that a skill lacks clarity.

Download Claude Code templates from aitmpl.com (GitHub API). Use PROACTIVELY to search and install agents, commands, skills, mcps, settings, hooks, and plugins.

I/O platform functions for the East language on Node.js. Use when writing East programs that need SQL databases (SQLite, PostgreSQL, MySQL), NoSQL databases (Redis, MongoDB), S3 storage, file transfers (FTP, SFTP), file format parsing (XLSX, XML), or compression (Gzip, Zip, Tar). Triggers for: (1) Writing East programs with @elaraai/east-node-io, (2) Database operations with SQL.SQLite, SQL.Postgres, SQL.MySQL, NoSQL.Redis, NoSQL.MongoDB, (3) Cloud storage with Storage.S3, (4) File transfers with Transfer.FTP, Transfer.SFTP, (5) Format parsing with Format.XLSX, Format.XML, (6) Compression with Compression.Gzip, Compression.Zip, Compression.Tar.

Target configuration for code generation. Defines deployment choices:API style, persistence, events, topology, language, standardization.Use when: starting new system, changing deployment targets, understandinggeneration options. These are CHOICES, not categorical structure.

Researches how to use an API, library, or reference architecture. Fallback when the WebSearch tool fails.

Generate and edit images using the Gemini API (Nano Banana). Use this skill when creating images from text prompts, editing existing images, applying style transfers, generating logos with text, creating stickers, product mockups, or any image generation/manipulation task. Supports text-to-image, image editing, multi-turn refinement, and composition from multiple reference images.

Comprehensive n8n v2.0 reference for building workflow automation. Use this skill when working with n8n workflows, especially for (1) creating workflow JSON files for import, (2) implementing human-in-the-loop approval workflows with Wait nodes, (3) troubleshooting Execute Sub-Workflow node issues, (4) setting up API credentials (LinkedIn, Anthropic, NewsAPI), (5) building orchestrator patterns with sub-workflows, (6) using expressions in nodes, (7) understanding MCP server limitations, or (8) any n8n workflow development task.

Audit claude-skills repository documentation with systematic 9-phase review: standards compliance, official docs verification via Context7/WebFetch, code examples accuracy, cross-file consistency, and version drift detection. Auto-fixes unambiguous issues with severity classification.Use when: investigating skill issues, major package updates detected (e.g., v1.x → v2.x), skill not verified >90 days, before marketplace submission, or troubleshooting outdated API patterns, contradictory examples, broken links, version drift.

Spring Modulith 2.0 implementation for bounded contexts in Spring Boot 4. Use when structuring application modules, implementing @ApplicationModuleListener for event-driven communication, testing with Scenario API, enforcing module boundaries, or externalizing events to Kafka/AMQP. For modular monolith architecture decisions, see the domain-driven-design skill.

Python asyncio - Modern concurrent programming with async/await, event loops, tasks, coroutines, primitives, aiohttp, and FastAPI async patterns

Use when you need to fine-tune(ファインチューニング) and optimize LangGraph applications based on evaluation criteria. This skill performs iterative prompt optimization for LangGraph nodes without changing the graph structure.

Natural language wrapper for PM workflow commands - automatically triggers /pm:epic-start, /pm:issue-start, /pm:prd-parse when users express PM workflow intent

Frontend-backend API contracts, routes, clients, and type definitions.Handles API endpoint definitions, request/response types, route configuration, and cross-stack integration.Use when working with API endpoints, request/response types, route definitions, or frontend-backend integration,or when user mentions API design, adding endpoints, type mismatches, API contracts, REST endpoints,client integration, "404 Not Found" errors, "Type error" in API calls, or route configuration issues.

Scaffolds a new FastAPI endpoint with Pydantic models, router registration, and tests. Use when creating new backend API endpoints.

Production-grade Flutter navigation mastery - Navigator 2.0, GoRouter, deep linking, nested navigation, route guards, web URL handling with comprehensive code examples

EVE Online ESI API integration skill for third-party development. Use when building EVE Online tools, apps, or games that need ESI endpoints, SSO authentication, image server assets, or SDE data. Triggers on EVE Online API work, ESI integration, EVE developer tools, ship renders, map data, character authentication, or EVE static data.

This skill should be used for REST API, GraphQL, versioning, pagination, authentication, backend routes, web services, HTTP endpoints, server API design

IntelliFill authentication flow patterns using Supabase Auth, JWT tokens, and backend auth mode

Comprehensive security auditing for Rails 8 applications using Brakeman and manual review. Use when reviewing authentication/authorization code, checking for OWASP Top 10 vulnerabilities, or validating security before deployment.

This skill retrieves upcoming earnings announcements for US stocks using the Financial Modeling Prep (FMP) API. Use this when the user requests earnings calendar data, wants to know which companies are reporting earnings in the upcoming week, or needs a weekly earnings review. The skill focuses on mid-cap and above companies (over $2B market cap) that have significant market impact, organizing the data by date and timing in a clean markdown table format. Supports multiple environments (CLI, Desktop, Web) with flexible API key management.