Use this agent when you need to plan the implementation of a new feature or significant enhancement to an existing codebase. Examples: <example>Context: User wants to add real-time collaboration to their note-taking app. user: 'I want to add real-time collaboration so multiple users can edit notes simultaneously' assistant: 'I'll use the architect agent to analyze the requirements, research implementation approaches, and create a comprehensive implementation plan.' <commentary>Since the user is requesting a new feature that requires thorough planning and research, use the architect agent to provide a complete implementation strategy.</commentary></example> <example>Context: User needs to implement a complex search feature with filters and sorting. user: 'We need to add advanced search with filters by date, tags, and content type, plus sorting options' assistant: 'Let me engage the architect agent to research search implementation patterns and create a detailed plan.' <commentary>This is a complex feature request that benefits from architectural planning and research into best practices.</commentary></example>