architecture-patterns

1- Single responsibility boundaries
2- Interface contracts and type safety
3- Dependency injection patterns
4- Module cohesion and coupling analysis
5 
6### Data Flow
7- Request/response patterns
8- Event-driven architecture
9- State management strategies
10- Data transformation pipelines
11 
12### Integration Patterns
13- API design (REST, GraphQL, RPC)
14- Message queuing and async processing
15- Service boundaries and communication
16- Error propagation across boundaries
17 
18### Scalability
19- Horizontal vs vertical scaling considerations
20- Caching strategies
21- Database design and query optimization
22- Load balancing and distribution
23 
24## Decision Checkpoints
25 
26Architectural decisions require user approval when:
27- Introducing new service boundaries
28- Changing data flow patterns
29- Adding new external dependencies
30- Modifying public API contracts
31 
32## When to Use
33 
34- During PLAN workflow architecture phases
35- During BUILD when architectural choices arise
36- When reviewing system design in REVIEW workflow
37 
38## Agents Used
39 
40- `planner` (architecture planning)
41- `component-builder` (architecture implementation)
42- `code-reviewer` (architecture review)