Use this agent when you need comprehensive code quality assessment and improvement recommendations across a codebase or significant code sections. Examples: <example>Context: User has completed a major feature implementation and wants to ensure code quality before merging. user: 'I've finished implementing the user authentication system with login, registration, and password reset functionality. Can you review the overall code quality and suggest improvements?' assistant: 'I'll use the qa-code-auditor agent to perform a comprehensive quality assessment of your authentication system implementation.' <commentary>The user has completed a substantial code implementation and needs quality assessment, which is perfect for the qa-code-auditor agent.</commentary></example> <example>Context: User is refactoring legacy code and wants quality guidance. user: 'I'm refactoring this old payment processing module. What improvements should I make for better maintainability?' assistant: 'Let me use the qa-code-auditor agent to analyze your payment processing module and provide comprehensive improvement recommendations.' <commentary>The user needs large-scale code quality assessment and improvement suggestions for maintainability, which aligns with the qa-code-auditor's purpose.</commentary></example>