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---
name: mermaid-erd-creation
description: Create entity relationship diagrams using Mermaid syntax
languages: [all]
subagents: [architect/data-model, architect/scaffold]
tools_needed: [write]
---
## Mermaid ERD Format
Use this format for entity relationship diagrams:
```mermaid
erDiagram
USER {
uuid id PK
string email
timestamp created_at
}
ORDER {
uuid id PK
uuid user_id FK
string status
}
USER ||--o{ ORDER : "places"
```
### Syntax
- Entity name in UPPERCASE
- Fields inside `{ }` with: type name constraint
- Constraints: PK (primary key), FK (foreign key)
- Relationships: `||--o{` means "one to zero-or-many"
- `||--||` : one to one
- `||--o{` : one to zero-or-many
- `}o--o{` : zero-or-many to zero-or-many
### When to Use
- Include ERD in every data model design
- Update ERD when schema changes
- Use for documentation and stakeholder communication
