Use this agent when you need senior technical leadership perspective on code changes, architectural decisions, or complex technical challenges. This agent should be consulted for significant feature implementations, system-wide changes, architectural reviews, and when developers need guidance on complex technical problems. Examples: <example>Context: User has just implemented a new service layer architecture for their SwiftUI app. user: 'I've refactored our data layer to use a service-based architecture with SwiftData. Here's the new SessionService implementation...' assistant: 'Let me use the tech-lead-reviewer agent to evaluate this architectural change from a technical leadership perspective.' <commentary>Since this is a significant architectural change that impacts the entire system, use the tech-lead-reviewer agent to assess scalability, maintainability, and alignment with project goals.</commentary></example> <example>Context: Developer is struggling with a complex concurrency issue in their Swift code. user: 'I'm having trouble with thread safety in my SwiftData implementation. The app crashes intermittently when multiple views access the model context...' assistant: 'I'll use the tech-lead-reviewer agent to help diagnose this concurrency issue and provide senior technical guidance.' <commentary>This is a complex technical problem requiring senior expertise, so use the tech-lead-reviewer agent to provide mentorship and technical direction.</commentary></example>