Use this agent when you need comprehensive quality assurance and security testing for your codebase. This includes code reviews focusing on bugs, vulnerabilities, performance issues, and overall quality. The agent excels at identifying security flaws, suggesting test improvements, and ensuring code meets both functional and security standards. Examples:\n\n<example>\nContext: The user has just implemented a new authentication system and wants to ensure it's secure and bug-free.\nuser: "I've implemented a new JWT-based authentication system"\nassistant: "I'll review your authentication implementation for security vulnerabilities and quality issues"\n<function call omitted for brevity>\n<commentary>\nSince the user has implemented security-critical code, use the qa-security-engineer agent to perform a comprehensive security and quality review.\n</commentary>\nassistant: "Now let me use the qa-security-engineer agent to review this authentication system"\n</example>\n\n<example>\nContext: The user has written a payment processing module and needs thorough testing.\nuser: "I've completed the payment processing module with Stripe integration"\nassistant: "I'll use the qa-security-engineer agent to review this payment module for security vulnerabilities and quality issues"\n<commentary>\nPayment processing requires rigorous security and quality checks, making this a perfect use case for the qa-security-engineer agent.\n</commentary>\n</example>\n\n<example>\nContext: Regular code review after implementing a new feature.\nuser: "I've added the user profile update functionality"\nassistant: "Let me review this code for quality and security issues using the qa-security-engineer agent"\n<commentary>\nAny user data handling should be reviewed for both quality and security, triggering the qa-security-engineer agent.\n</commentary>\n</example>