Refactor MessageHandler and follow Clean Architecture, SOLID and DDD principles

[golpeandopelotas]

Current Situation:
The MessageHandler tool is currently duplicated across multiple agent folders, violating DRY and SOLID principles and making maintenance difficult. Reference: tools/message_handler.py in each agent's directory.

Problem:

1. Code duplication across agents
2. Potential inconsistencies in message handling
3. Difficult maintenance when updates are needed
4. Violation of Single Responsibility Principle

Proposed Solution:
Based on the Agency Swarm framework structure, here's how I would reorganize it to better follow DDD, SOLID, TDD, and Clean Code principles:

agency_name/
├── domain/
│   ├── entities/
│   │   ├── agent.py
│   │   └── tool.py
│   ├── value_objects/
│   │   └── agent_config.py
│   ├── repositories/
│   │   ├── agent_repository.py
│   │   └── tool_repository.py
│   └── services/
│       └── communication_service.py
│
├── application/
│   ├── agents/
│   │   ├── ceo/
│   │   │   ├── __init__.py
│   │   │   ├── ceo_agent.py
│   │   │   ├── instructions.md
│   │   │   └── tools/
│   │   └── developer/
│   │       ├── __init__.py
│   │       ├── developer_agent.py
│   │       ├── instructions.md
│   │       └── tools/
│   └── use_cases/
│       ├── create_agent.py
│       └── send_message.py
│
├── infrastructure/
│   ├── persistence/
│   │   └── settings_repository.py
│   ├── external_services/
│   │   └── openai_service.py
│   └── logging/
│       └── logger.py
│
├── interfaces/
│   ├── api/
│   │   └── rest_controller.py
│   └── cli/
│       └── command_line.py
│
├── tests/
│   ├── unit/
│   │   ├── domain/
│   │   ├── application/
│   │   └── infrastructure/
│   ├── integration/
│   └── e2e/
│
├── agency.py
├── agency_manifesto.md
├── requirements.txt
└── .env

Key improvements:

1. Domain Layer:

   • Separates core business logic into entities, value objects, and domain services
   • Makes the agent and tool concepts first-class citizens in the domain
   • Follows Single Responsibility Principle with clear separation of concerns

2. Application Layer:

   • Contains use cases and orchestration logic
   • Maintains agent-specific implementations while adhering to domain interfaces
   • Follows Interface Segregation Principle with focused use cases

3. Infrastructure Layer:

   • Handles external concerns like persistence and third-party services
   • Implements repository interfaces defined in the domain
   • Follows Dependency Inversion Principle

4. Interface Layer:

   • Provides different ways to interact with the system
   • Separates presentation concerns from business logic
   • Follows Open/Closed Principle for adding new interfaces

5. Tests:

   • Organized by test type (unit, integration, e2e)
   • Mirrors the main project structure
   • Supports Test-Driven Development

6. Clean Code Principles:

   • Clear folder structure with meaningful names
   • Single responsibility for each module
   • Easy to navigate and understand

This structure would require some refactoring of the existing code, but would provide:

• Better separation of concerns
• Easier testing
• More maintainable codebase
• Clearer dependencies
• Better scalability

Benefits:

1. Single source of truth for message handling
2. Clear separation of concerns
3. Easier testing and maintenance
4. Better dependency management
5. Consistent message handling across all agents

Implementation Notes:

1. Move core message handling logic to domain layer
2. Create proper interfaces for dependency inversion
3. Implement repository pattern for message storage
4. Update agent tools to use the centralized message service
5. Add proper unit tests for each layer

Breaking Changes:

• Will require updating import paths in all agents
• Need to migrate existing message handling logic

Labels: enhancement, architecture, clean-code

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