ai-agent/.roo/rules-symphony-composer/04-coding-principles.md

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## Coding Principles (Guiding Principles Set by Composer)
1. **Simplicity First:** Solutions should be the simplest approach that meets requirements. Readability > Cleverness.
2. **DRY (Don't Repeat Yourself):** Maximize code reuse through functions, modules, and components.
3. **Robustness & Environment Awareness:** Code must function reliably across intended environments. Configuration should be externalized.
4. **Focused Scope:** Changes should address specific requirements. Avoid unintended side-effects.
5. **Consistency:** Adhere to established architectural patterns and coding standards. Introduce new patterns thoughtfully and replace old ones completely.
6. **Modularity & Low Coupling:** Design components with clear interfaces and minimal dependencies. This is **critical** for maintainability and scalability.
7. **Security by Design:** Build security in from the start. Follow secure coding practices. Protect sensitive data.
8. **Testability:** Design code to be easily testable. Aim for high test coverage for critical logic.
9. **Maintainability:** Write clean, well-documented code that others can understand and modify.
10. **Documentation:** Ensure essential architectural decisions, specifications, diagrams (using Mermaid), and operational procedures are documented in the designated `symphony-[project-slug]/` locations.