# Design Document

## Architecture Overview

{Describe the architecture pattern to adopt}

```
{Describe the architecture diagram in text or Mermaid}
```

## Component Design

### 1. {Component name 1}

**Responsibilities**:
- {Responsibility 1}
- {Responsibility 2}

**Implementation highlights**:
- {Points to note during implementation}
- {Technical constraints}

### 2. {Component name 2}

**Responsibilities**:
- {Responsibility 1}
- {Responsibility 2}

**Implementation highlights**:
- {Points to note during implementation}
- {Technical constraints}

## Data Flow

### {Use case name}
```
1. {Step 1}
2. {Step 2}
3. {Step 3}
```

## Error Handling Strategy

### Custom Error Classes

{Define the necessary error classes}

### Error Handling Patterns

{How errors are handled}

## Test Strategy

### Unit Tests
- {Test target 1}
- {Test target 2}

### Integration Tests
- {Test scenario 1}
- {Test scenario 2}

## Dependent Libraries

{Describe any newly added libraries}

```json
{
  "dependencies": {
    "{library name}": "{version}"
  }
}
```

## Directory Structure

```
{File structure to be added or changed}
```

## Implementation Order

1. {Implementation step 1}
2. {Implementation step 2}
3. {Implementation step 3}

## Security Considerations

- {Security-related points to note}

## Performance Considerations

- {Performance-related points to note}

## Future Extensibility

{A design that accounts for future extensions}