Trigger only when an already-approved PLAN.md or equivalent structured plan must be executed through wave-ordered tasks, isolated git worktrees, wave-level verification, final integration, and controlled merge handling; never create the plan or execute unapproved work.
Trigger only to inspect an existing diff, commit, branch, or PR for correctness, regression, security, performance, and maintainability issues; do not use to implement changes or run acceptance verification.
Trigger only when an observed failure, reproducible bug, regression, stack trace, failing test, or merge conflict requires evidence-based root-cause diagnosis before applying or recommending a fix.
Trigger only when the user explicitly requests test-driven implementation or when an assigned task requires adding behavior by first writing a failing test, then minimal code, then refactoring without behavior change.
Trigger only when a coding task requires a written implementation plan before execution, especially multi-file or multi-step work needing dependency analysis, wave classification, and file-isolation-safe task partitioning; dispatches Planner to write a timestamped plan under ~/.yi-workflow/docs/plans/ and performs no implementation.
Trigger only after an implementation exists and must be validated against an explicit plan, acceptance criteria, or expected behavior by running relevant checks and reporting evidence-backed pass/fail results.