Use when you need exact regex/format details for goal-mode tag emission (parse-tags.mjs semantics, code-fence stripping, attribute quoting, escape-hatch regex, edge cases). Use BEFORE emitting a complex/long verdict or evidence block to verify the tag is parseable.
Use when an active goal-mode plan-tree is driving the conversation (Stop hook fires continuation prompts, lifecycle is pursuing/paused/awaiting-manual-approval/blocked) OR before /goal-plan, /goal-start, /goal-approve, /goal-resume, /goal-abandon, /goal-clear — covers tag emission discipline, escape-hatch protocol, lifecycle states, anti-patterns, multi-session cross-project isolation, and recovery paths.