Don't Repeat Yourself (DRY) and Never Reinvent the Wheel (NRtW) - core b00t principles. Use existing libraries, leverage Rust via PyO3 instead of duplicating logic in Python, and contribute to upstream projects rather than fork privately.
Guide for creating C4 model design documents. Use this when asked to create architecture designs, system context diagrams, container diagrams, or component diagrams following the C4 model methodology.
Guide for applying MUSUBIX's 17 learned best practices. Use this when asked about coding patterns, design patterns, or testing patterns that MUSUBIX recommends.
Guide for creating Architecture Decision Records (ADRs). Use this when asked to document architecture decisions, technology choices, or design trade-offs.
Implement Effect services as fine-grained capabilities avoiding monolithic designs
Create production-ready Effect domain models using Schema.TaggedStruct for ADTs, Schema.Data for automatic equality, with comprehensive predicates, orders, guards, and match functions. Use when modeling domain entities, value objects, or any discriminated union types.
Design and compose Effect layers for clean dependency management
Expert guidance on Swift Concurrency concepts. Use when working with async/await, Tasks, actors, MainActor, Sendable, isolation domains, or debugging concurrency compiler errors. Helps write safe concurrent Swift code.
Master declarative parameter systems with Param for type-safe configuration. Use this skill when building parameterized classes with automatic validation, creating reactive dependencies with @param.depends, implementing watchers for side effects, auto-generating UIs from parameters, or organizing application configuration with hierarchical parameter structures.
Decide between Context Tag witness and capability patterns for dependency injection, understanding coupling trade-offs
World-class Java and Spring Boot development skill for enterprise applications, microservices, and cloud-native systems. Expertise in Spring Framework, Spring Boot 3.x, Spring Cloud, JPA/Hibernate, and reactive programming with WebFlux. Includes project scaffolding, dependency management, security implementation, and performance optimization.
Reduce complexity by revealing information progressively. Use when designing onboarding, complex forms, feature-rich interfaces, or any experience where showing everything at once would overwhelm users.
Extracts system architecture and creates data flow documentation (Stages 1, 2, 6). Focuses on source traceability and accurate information extraction. Does NOT perform security analysis or quality validation.
Comprehensive security engineering skill for application security, penetration testing, security architecture, and compliance auditing. Includes security assessment tools, threat modeling, crypto implementation, and security automation. Use when designing security architecture, conducting penetration tests, implementing cryptography, or performing security audits.
Create a new event-sourced aggregate with proper Apply methods, event handling, and Marten configuration. Use this when adding a new domain entity that needs event sourcing.
Create a new Marten read model projection for CQRS queries. Use this when you need to create an optimized read model from event streams.
Technical implementation planning and architecture design. Capabilities: feature planning, system architecture, technical evaluation, implementation roadmaps, requirement breakdown, trade-off analysis, codebase analysis, solution design. Actions: plan, architect, design, evaluate, breakdown technical solutions. Keywords: implementation plan, technical design, architecture, system design, roadmap, requirements analysis, trade-offs, technical evaluation, feature planning, solution design, scalability, security, maintainability, sprint planning, task breakdown. Use when: planning new features, designing system architecture, evaluating technical approaches, creating implementation roadmaps, breaking down complex requirements, assessing technical trade-offs.
Write Architectural Decision Records following MADR template. Applies Definition of Done criteria, marks gaps for later completion. Use when generating ADR documents from extracted decisions.
Master Effect pattern matching using Data.TaggedEnum, $match, $is, Match.typeTags, and Effect.match. Avoid manual _tag checks and Effect.either patterns. Use this skill when working with discriminated unions, ADTs, or conditional logic based on tagged types.
Use when explaining or applying Spec-Driven Development workflow, guiding through SDD phases, or helping with workflow decisions. Invoked for methodology guidance, workflow optimization, and best practices.
Provides DDD layered architecture patterns. Use when designing domain-centric systems or structuring complex business logic.
Go and Rust systems programming best practices for performance-critical, concurrent, and safe applications. Covers error handling, ownership/borrowing (Rust), context and goroutines (Go), testing patterns, and production deployment. Use when working with .go, .rs files, Cargo.toml, go.mod, or when asking about Go or Rust development.
