---
id: STRUCTURE-001
version: 0.1.1
status: active
created: 2025-10-01
updated: 2025-10-17
author: @architect
priority: medium
---

# {{PROJECT_NAME}} Structure Design

## HISTORY

### v0.1.1 (2025-10-17)
- **UPDATED**: Template version synced (v0.3.8)
- **AUTHOR**: @Alfred
- **SECTIONS**: Metadata standardization (single `author` field, added `priority`)

### v0.1.0 (2025-10-01)
- **INITIAL**: Authored the structure design document
- **AUTHOR**: @architect
- **SECTIONS**: Architecture, Modules, Integration, Traceability

---

## @DOC:ARCHITECTURE-001 System Architecture

### Architectural Strategy

**[Describe the end-to-end architectural approach for the project]**

```
Project Architecture
- [Layer 1]          # [Describe its responsibilities]
- [Layer 2]          # [Describe its responsibilities]
- [Layer 3]          # [Describe its responsibilities]
- [Layer 4]          # [Describe its responsibilities]
```

**Rationale**: [Explain the trade-offs behind the chosen architecture]

## @DOC:MODULES-001 Module Responsibilities

### 1. [Primary Module 1]

- **Responsibilities**: [Key duties of the module]
- **Inputs**: [Data it consumes]
- **Processing**: [Core processing steps]
- **Outputs**: [Produced artifacts]

| Component     | Role   | Key Capabilities |
| ------------- | ------ | ---------------- |
| [Component 1] | [Role] | [Feature list]   |
| [Component 2] | [Role] | [Feature list]   |

### 2. [Primary Module 2]

- **Responsibilities**: [Key duties of the module]
- **Inputs**: [Data it consumes]
- **Processing**: [Core processing steps]
- **Outputs**: [Produced artifacts]

## @DOC:INTEGRATION-001 External Integrations

### [External System 1] Integration

- **Authentication**: [Method used]
- **Data Exchange**: [Formats and protocols]
- **Failure Handling**: [Fallback strategy]
- **Risk Level**: [Risk profile and mitigation]

### [External System 2] Integration

- **Purpose**: [Why it is used]
- **Dependency Level**: [Degree of reliance and alternatives]
- **Performance Requirements**: [Latency, throughput, etc.]

## @DOC:TRACEABILITY-001 Traceability Strategy

### Applying the TAG Framework

**Full TDD Alignment**: SPEC → Tests → Implementation → Documentation
- `@SPEC:ID` (`.moai/specs/`) → `@TEST:ID` (`tests/`) → `@CODE:ID` (`src/`) → `@DOC:ID` (`docs/`)

**Implementation Detail Levels**: Annotation within `@CODE:ID`
- `@CODE:ID:API` – REST APIs, GraphQL endpoints
- `@CODE:ID:UI` – Components, views, screens
- `@CODE:ID:DATA` – Data models, schemas, types
- `@CODE:ID:DOMAIN` – Business logic, domain rules
- `@CODE:ID:INFRA` – Infrastructure, databases, integrations

### Managing TAG Traceability (Code-Scan Approach)

- **Verification**: Run `/alfred:3-sync`, which scans with `rg '@(SPEC|TEST|CODE|DOC):' -n`
- **Coverage**: Full project source (`.moai/specs/`, `tests/`, `src/`, `docs/`)
- **Cadence**: Validate whenever the code changes
- **Code-First Principle**: TAG truth lives in the source itself

## Legacy Context

### Current System Snapshot

**[Describe the existing system or assets]**

```
Current System/
├── [Component 1]/     # [Current state]
├── [Component 2]/     # [Current state]
└── [Component 3]/     # [Current state]
```

### Migration Considerations

1. **[Migration item 1]** – [Plan and priority]
2. **[Migration item 2]** – [Plan and priority]
3. **[Migration item 3]** – [Plan and priority]

## TODO:STRUCTURE-001 Structural Improvements

1. **Define module interfaces** – [Plan details]
2. **Dependency management strategy** – [Plan details]
3. **Scalability roadmap** – [Plan details]

## EARS for Architectural Requirements

### Applying EARS to Architecture

Use EARS patterns to write clear architectural requirements:

#### Architectural EARS Example
```markdown
### Ubiquitous Requirements (Baseline Architecture)
- The system shall adopt a layered architecture.
- The system shall maintain loose coupling across modules.

### Event-driven Requirements
- WHEN an external API call fails, the system shall execute fallback logic.
- WHEN a data change event occurs, the system shall notify dependent modules.

### State-driven Requirements
- WHILE the system operates in scale-out mode, it shall load new modules dynamically.
- WHILE in development mode, the system shall provide verbose debug information.

### Optional Features
- WHERE the deployment runs in the cloud, the system may use distributed caching.
- WHERE high performance is required, the system may apply in-memory caching.

### Constraints
- IF the security level is elevated, the system shall encrypt all inter-module communication.
- Each module shall keep cyclomatic complexity under 15.
```

---

_This structure informs the TDD implementation when `/alfred:2-run` runs._
