Polish by Diff

What this skill does

polish-by-diff turns the destructive in-place behavior of the polish skill (humanizer + writing-clearly-and-concisely) into a review-and-apply pipeline. The original manuscript files are never edited until the user explicitly approves each change. Parallel subagents do the polish work in isolation; the main agent collects diffs, walks the user through them, and only then applies the approved subset.

The pipeline has four stages: