architecture
Software architecture tools -- generate diagrams (Mermaid, PlantUML), write ADRs, and document design decisions.
What this skill does
# Architecture
Tools for documenting and visualizing software architecture.
## Mermaid diagrams
Generate Mermaid diagram syntax for rendering in Markdown or docs.
### Sequence diagram
```
sequenceDiagram
participant Client
participant API
participant DB
Client->>API: POST /login
API->>DB: SELECT user
DB-->>API: user record
API-->>Client: 200 JWT token
```
### Architecture diagram (flowchart)
```
flowchart TD
LB[Load Balancer] --> API1[API Server 1]
LB --> API2[API Server 2]
API1 --> DB[(PostgreSQL)]
API2 --> DB
API1 --> Cache[(Redis)]
API2 --> Cache
API1 --> Queue[SQS Queue]
Queue --> Worker[Worker Service]
Worker --> DB
```
### Entity relationship diagram
```
erDiagram
USER ||--o{ ORDER : places
ORDER ||--|{ LINE_ITEM : contains
PRODUCT ||--o{ LINE_ITEM : "ordered in"
USER {
string id PK
string email
string name
}
ORDER {
string id PK
string userId FK
datetime createdAt
}
```
### C4 Context (using flowchart)
```
flowchart TD
User[fa:fa-user User] -->|Uses| WebApp[Web Application]
WebApp -->|API calls| Backend[Backend Service]
Backend -->|Reads/Writes| DB[(Database)]
Backend -->|Sends| Email[Email Service]
Backend -->|Publishes| Queue[Message Queue]
```
## Architecture Decision Records (ADR)
Write ADRs to `docs/adr/` using the standard template:
```bash
mkdir -p docs/adr
cat > docs/adr/0001-use-postgresql.md << 'EOF'
# 1. Use PostgreSQL as Primary Database
Date: $(date +%Y-%m-%d)
## Status
Accepted
## Context
We need a relational database for our application data.
## Decision
We will use PostgreSQL as our primary database.
## Consequences
- Strong SQL support and JSON capabilities
- Well-supported by our ORM (Prisma/TypeORM)
- Requires operational knowledge for maintenance
EOF
```
### List ADRs
```bash
ls -1 docs/adr/*.md 2>/dev/null | while read f; do head -1 "$f" | sed 's/^# //'; done
```
## PlantUML (text-based)
```
@startuml
actor User
participant "Web App" as Web
participant "API" as API
database "DB" as DB
User -> Web : Login
Web -> API : POST /auth
API -> DB : Query user
DB --> API : User data
API --> Web : JWT
Web --> User : Dashboard
@enduml
```
## Dependency graph (from package.json)
```bash
python3 -c "
import json, sys
pkg = json.load(open('package.json'))
deps = pkg.get('dependencies', {})
name = pkg.get('name', 'app')
lines = ['flowchart LR']
for dep in sorted(deps):
lines.append(f' {name} --> {dep}')
print('\n'.join(lines))
"
```
## Notes
- Mermaid renders natively in GitHub Markdown (use ```mermaid code blocks).
- ADRs should be numbered sequentially and never deleted (supersede instead).
- Keep diagrams in version control alongside code.
- Use C4 model levels: Context → Container → Component → Code.
Related in Design
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