Use EVERY TIME you need to run tests, verify tests pass, or check for regressions. ALWAYS use this instead of running eldev directly.
Use when code quality needs improvement after implementation, without changing behavior
Use when implementation is complete and you want to verify quality through adversarial testing that writes code and provides evidence
Use when a design exists and it's time to break it into tasks and execute with subagent dispatch and review
Use when requirements exist and a technical design is needed before implementation begins
Use when a new feature request, bug report, or work request needs requirements defined before implementation
Use when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY response including clarifying questions
Use when creating new skills, editing existing skills, or verifying skills work before deployment