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When a task decomposes into independent slices — separate files, OR separate sections of ONE file — fan it out: write job files to the subagent queue and the host runs real parallel Codex workers for you. For a single file, extract per-section slice files into the queue's work/ zone, let workers polish them in parallel, then reassemble (scatter-gather). Every job must state an explicit, non-overlapping scope.

When editing `.tex` files, use this skill as often as possible. When rewriting `.tex` content spanning more than a few words, comment out the original and write the replacement below it so the user can review the before/after diff directly in the source.