plantuml

## When to use this skill

**ALWAYS use this skill when the user mentions:**
- PlantUML, UML diagrams, or explicitly requests PlantUML syntax
- Complex architecture diagrams, C4 model diagrams, or enterprise-level diagrams
- Standard UML diagrams: class diagrams, sequence diagrams, component diagrams, deployment diagrams, state diagrams, activity diagrams, use case diagrams
- Architecture documentation requiring precise UML notation
- Diagrams that need advanced customization, styling, or layout control
- Enterprise system architecture, microservices architecture, or distributed system diagrams
- Any request to "用 PlantUML 画图" (draw with PlantUML), "用 UML 图" (use UML diagram), "画类图" (draw class diagram), "画组件图" (draw component diagram)

**Trigger phrases include:**
- "用 PlantUML" (use PlantUML), "用 PlantUML 画" (draw with PlantUML), "PlantUML 语法" (PlantUML syntax)
- "UML 图" (UML diagram), "类图" (class diagram), "时序图" (sequence diagram), "组件图" (component diagram), "部署图" (deployment diagram)
- "C4 模型" (C4 model), "架构图" (architecture diagram), "系统架构图" (system architecture diagram)
- "活动图" (activity diagram), "状态图" (state diagram), "用例图" (use case diagram)
- "画 UML" (draw UML), "UML 类图" (UML class diagram), "UML 时序图" (UML sequence diagram)
- Any mention of "PlantUML", "UML", "class diagram", "sequence diagram", "component diagram", "deployment diagram", "C4 model"

**IMPORTANT: PlantUML vs Mermaid - Two Different Diagramming Tools:**

PlantUML and Mermaid are two different diagramming tools with different purposes:

- **PlantUML**: A component that allows you to create various UML diagrams through simple textual descriptions. From sequence diagrams to deployment diagrams and beyond, PlantUML provides an easy way to create visual representations of complex systems. PlantUML is primarily focused on UML standards and is ideal for UML diagrams, enterprise architecture, C4 models, and diagrams requiring precise UML notation.

- **Mermaid**: A JavaScript-based diagramming and c