Use when asked to systematically audit, review, reconcile, migrate, or weed out issues across many files or items, when work will recur or needs babysitting, or whenever a task fits a Codex power tool the user didn't ask for by name - subagent fan-out (audits, repo-wide sweeps, judge panels, adversarial verification), /goal (a multi-turn mission lacking a verifiable finish line), an Automation or codex exec cron (polling, recurring or deferred obligations), capturing a just-invented technique as a skill or a recurring role as a custom agent, a lifecycle hook for "from now on, when X..." patterns, a decision-log entry for a durable principle, or effort recalibration (model and reasoning depth, /fast, review depth) when task gravity doesn't match the approach. Noticing is the job - propose the tool with an honest cost sketch during ANY substantive task whose shape matches, including "how do we do this thoroughly/across the board" asks.
2026-07-01