README

Design Patterns Documentation

Overview

This directory contains detailed documentation of the design patterns used throughout the HawkEye MCP security reconnaissance tool. Each pattern is documented separately to provide reusable knowledge that can be referenced from the command-specific documentation.

Pattern Documentation Structure

Each design pattern document follows a consistent structure:

1. Pattern Overview

• Intent: What problem does this pattern solve?
• Also Known As: Alternative names for the pattern
• Motivation: Real-world scenarios that led to using this pattern

2. Structure

• UML Class Diagram: Visual representation of the pattern
• Participants: Key classes/interfaces involved
• Collaborations: How participants work together

3. Implementation in HawkEye

• Concrete Examples: Actual classes from the codebase
• Code Snippets: Key implementation details
• Variations: How the pattern is adapted for specific needs

4. Analysis

• Benefits: Advantages gained from using this pattern
• Drawbacks: Trade-offs and potential issues
• Performance Implications: Impact on system performance

5. Related Patterns

• Complementary Patterns: Patterns often used together
• Alternative Patterns: Other solutions to similar problems

Design Patterns Used in HawkEye

1. Abstract Base Class (ABC) Pattern

File: abstract-base-class-pattern.md Usage: MCPDetector, BaseScanner, RiskAssessor, BaseReporter Purpose: Defines common interface and shared behavior for polymorphic class hierarchies

2. Strategy Pattern

File: strategy-pattern.md Usage: Detection strategies, Scanner types, Reporter formats Purpose: Encapsulates interchangeable algorithms and makes them pluggable

3. Factory Pattern

File: factory-pattern.md Usage: Pipeline creation, Transport factory, Reporter instantiation Purpose: Creates objects without specifying exact classes, promotes loose coupling

4. Command Pattern

File: command-pattern.md Usage: CLI command structure using Click framework Purpose: Encapsulates requests as objects, supports queuing and undo operations

5. Template Method Pattern

File: template-method-pattern.md Usage: Base classes with abstract methods and concrete implementations Purpose: Defines algorithm skeleton, letting subclasses override specific steps

6. Chain of Responsibility Pattern

File: chain-of-responsibility-pattern.md Usage: Detection pipeline, Assessment chain Purpose: Passes requests along a chain of handlers until one handles it

7. Builder Pattern

File: builder-pattern.md Usage: ReportData construction, PipelineConfig assembly Purpose: Constructs complex objects step by step with flexible configuration

8. Adapter Pattern

File: adapter-pattern.md Usage: Transport layers, MCP version compatibility, Legacy system integration Purpose: Allows incompatible interfaces to work together

Cross-References

Each pattern document includes cross-references to:

• Command Documentation: Where the pattern is used in scan/detect/analyze-threats
• Architecture Documentation: How the pattern fits into the overall system
• Code Locations: Specific files and classes implementing the pattern

Usage Guidelines

When working on the HawkEye codebase:

1. Before Adding New Components: Check if existing patterns can be extended
2. When Modifying Existing Code: Ensure pattern integrity is maintained
3. During Code Reviews: Verify pattern implementations follow documented structure
4. For New Features: Consider which patterns are most appropriate

Pattern Evolution

As the codebase evolves, patterns may need to be:

• Extended: Adding new concrete implementations
• Modified: Adapting to new requirements while maintaining core structure
• Refactored: Improving implementation while preserving interface contracts
• Deprecated: Replacing with better alternatives when necessary

Contributing

When updating pattern documentation:

1. Keep examples current with the codebase
2. Update UML diagrams when structure changes
3. Document any deviations from standard pattern implementations
4. Maintain cross-references to command documentation