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, externalizing events to Kafka/AMQP, building a modular monolith, defining module dependencies, managing inter-module events, or organizing DDD modules as packages. Covers package-based module boundaries, named interfaces, event publication, and Scenario API testing. For architecture decisions, see domain-driven-design skill.
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Implements DDD bounded contexts as application modules with enforced boundaries and event-driven communication.
| Concept | Description |
|---|---|
| Application Module | Package-based boundary = bounded context |
| Module API | Types in base package (public) |
| Internal | Types in sub-packages (encapsulated) |
| Events | Cross-module communication mechanism |
src/main/java/
├── com.example/
│ └── Application.java ← @SpringBootApplication
├── com.example.order/ ← Module: order
│ ├── OrderService.java ← Public API
│ ├── OrderCreated.java ← Public event
│ ├── package-info.java ← @ApplicationModule config
│ └── internal/ ← Encapsulated
│ ├── OrderRepository.java
│ └── OrderEntity.java
├── com.example.inventory/ ← Module: inventory
│ ├── InventoryService.java
│ └── internal/
└── com.example.shipping/ ← Module: shipping
Types in com.example.order = public API
Types in com.example.order.internal = hidden from other modules
See EXAMPLES.md for complete working examples including:
@Async + @Transactional(REQUIRES_NEW) + @TransactionalEventListener(AFTER_COMMIT)@Externalized annotation for Kafka/AMQP| Need | Skill |
|---|---|
| DDD concepts | domain-driven-design |
| Data layer per module | spring-boot-data-ddd |
| Module event testing | spring-boot-testing |
| REST APIs for modules | spring-boot-web-api |
| Anti-Pattern | Fix |
|---|---|
| Direct bean injection across modules | Use events or expose API |
| Synchronous cross-module calls | Use @ApplicationModuleListener |
| Module dependencies not declared | Add allowedDependencies in @ApplicationModule |
| Missing verification test | Add ApplicationModules.verify() test |
| Internal types in public API | Move to .internal sub-package |
| Events without data | Include all data handlers need |
ApplicationModules.verify() catches boundary violations@ApplicationModuleListener ensures isolation아직 리뷰가 없습니다. 사용해 본 소감을 남겨 주세요.
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Create, review, and manage Architecture Decision Records (ADRs) with auto-numbering, template detection, quality review, and index maintenance. Use when user mentions "ADR", "architecture decision", "document this decision", "create ADR", "review ADR", editing ADR files (docs/adr/, doc/adr/, .adr/), or discussing architectural choices and tradeoffs.
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Analyze system architecture, module structure, API contracts, data models, and code patterns. Use when designing systems, reviewing module boundaries, evaluating API designs, analyzing data models, checking pattern conformance, tracing decisions, or reviewing frontend architecture. Triggers: "architecture", "module design", "API design", "data model", "boundaries", "patterns", "decisions", "frontend architecture".
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Converts natural-language descriptions or UI spec files into optimized Google Stitch prompts. Use when creating, refining, or validating design directives for Google Stitch. Use when user says "create a Stitch prompt", "optimize this for Stitch", "convert this spec to a Stitch prompt", "write a UI prompt", or mentions Google Stitch prompt authoring. Follows Stitch best practices with short, directive prompts focused on screens, structure, and visual hierarchy.
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Zero-dependency live-preview server providing an agent↔browser bidirectional companion. Watches a content directory, wraps HTML fragments in a frame template, broadcasts live-reload over WebSocket, and captures browser-side click events to a JSONL file. Use when an agent needs to show HTML to the user in a browser and react to clicks — mockups, design exploration, gallery browsing, multi-select choices, prototype iteration. Triggered by "live preview", "browser companion", "preview server", "browser mockup", "show in browser", "arkhe-preview", or any skill that wants to write HTML fragments and have the user see them reload in real time.
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Deletes merged git branches (local and remote) and flags stale unmerged branches for manual review. Use when user mentions "cleanup branches", "delete merged branches", "prune old branches", "remove stale branches", "branch cleanup", or runs /cleanup-branches command.
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Interactive Claude Code environment setup wizard. Detects existing configuration, guides through best-practice setup for Global CLAUDE.md, project scaffolding, MCP servers, hooks, custom agents, keybindings, and settings. Use when user runs /devtools:code-env-setup, mentions "setup claude code", "configure claude", "claude code setup", "environment setup", or "initialize claude code".
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