Backend

Configure Grafana Loki logging using mazza-base library for Python/Flask applications with CA certificate (Mazza-specific). Use when setting up Loki logging for Mazza projects or configuring centralized logging.

Apply when writing end-to-end tests: user flows, cross-browser testing, visual regression, and API testing.

Laravel 12 best practices, Eloquent patterns, service classes, Form Requests, and PHP 8.x features. Use when working with Laravel projects, controllers, models, migrations, or any PHP backend code.

Django caching patterns for the World of Darkness application. Use when implementing view caching, queryset caching, cache invalidation, or optimizing database queries. Triggers on performance optimization, cache configuration, slow query fixes, or Redis cache usage.

Apply when validating API request inputs: body, query params, path params, and headers. This skill covers Zod v4 patterns.

Enforces Go backend best practices following clean architecture, dependency injection, and test-driven development. Automatically applied for Go backend implementation, API development, and microservices construction.

Pure Bun-native filesystem utilities from @sidequest/core/fs. Use when you need command-injection-safe filesystem operations, prefer Bun over node:fs, or want token-efficient fs helpers. All functions use Bun.spawn, Bun.file(), or Bun.write() - no node:fs dependencies.

Spring Boot and Java best practices for SpecFlux backend. Use when developing REST APIs, services, repositories, or any Java code. Applies DDD architecture, OpenAPI-first workflow, transaction management, and test-driven development.

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, and orchestration 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

When implementing backend APIs, database queries, authentication, or handling user input.

Safe code refactoring with test protection and incremental changes. Improves structure without changing behavior. Use when extracting methods, reducing duplication, or restructuring code.

Reference catalog for all running coach AI skills, shared TypeScript contracts, safety guardrails, and telemetry conventions. Use when working with any running coach feature to understand data schemas, safety patterns, or integration points.

Intelligent MCP server recommendation engine based on quantitative domain analysis. Maps project domains (Frontend %, Backend %, Database %, etc.) to appropriate MCP servers using tier-based priority system (Mandatory > Primary > Secondary > Optional). Performs health checking, generates setup instructions, provides fallback chains. Use when: analyzing project needs, configuring MCPs, checking MCP health, recommending alternatives.

Define and enforce error budgets and SLO guardrails; use when asked to balance velocity with reliability targets.

Provides KurrentDB (EventStoreDB) client code for event sourcing and CQRS. Generates correct package names, connection strings, and API patterns for Python, Node.js, .NET, F#, Go, Java, Rust. Triggers on "kurrentdb", "eventstore", "event sourcing", "append events", "read stream", "subscription", "aggregate", "CQRS".

Laravel framework mastery - Eloquent, Blade, APIs, queues, and Laravel 11.x ecosystem

Apply when writing code documentation: JSDoc comments, README files, API documentation, and inline comments.

Interactive plugin setup and scaffolding tool for Claude Code plugins. Use this skill when user asks to "create plugin", "new plugin", "scaffold plugin", "setup plugin", "initialize plugin", "add command", "add skill", "add agent", "add hook", "add MCP server", or mentions creating Claude Code plugin components.

Guides creation of high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK). Covers tool design, authentication, Docker deployment, and evaluation creation. NOT when consuming existing MCP servers (use the server directly).

Python開発ガイド。FastAPI、Django、Flask、型ヒント、非同期処理、データ処理、パフォーマンス最適化など、Pythonアプリケーション開発のベストプラクティス。