# Interfaces
## Purpose
Protocol definitions and interface contracts for all system managers enabling dependency injection, testing isolation, and architectural flexibility.
## Key Components
- **manager_protocols.py**: Comprehensive protocol definitions for all core system managers with security contracts and performance specifications
## Architecture & Dependencies
**External**: typing, typing_extensions for Protocol support and advanced type annotations
**Internal**: Types system for all domain objects, security contexts, and validation
**Patterns**: Protocol pattern for structural typing, Interface Segregation Principle, Dependency Inversion Principle
## Critical Considerations
- **Security**: All protocols enforce security context validation and authorization requirements
- **Performance**: Protocol methods designed for O(1) to O(log n) operations with comprehensive resource monitoring
- **Integration**: Protocols support async/await patterns for non-blocking concurrent operations with complete error handling
## Related Documentation
- [ARCHITECTURE.md](../../ARCHITECTURE.md) - System architecture overview with protocol integration
- [TASK_4.md](../../development/tasks/TASK_4.md) - Manager implementation requirements and specifications
