The best magic upgrade order in Clean The Library starts with the route problem that wastes the most time: buy or use magic that fixes sorting before magic that only helps a perfect route. Most players are not losing early runs because their top speed is low. They are losing time because books are in bad piles, the wrong book is on top, or they do not know where the next shelf is.
Route notes often mention Assemble, Sort, Insight, Shelf Guide, and Auto-Shelving as the main magic or ability path. Those names need to match the live ability list before you build a route around them. The route logic is the sequence of problems they solve. First, reduce pile chaos. Then reduce manual sorting. Then reduce search time. Finally, automate or accelerate the parts of the route you already understand.
For beginners, magic is a poor substitute for controls. If you cannot pick up, drop, and cycle books smoothly, magic will hide mistakes for a short time and then create new ones when the ability is unavailable. Finish normal shelves first. Learn where books tend to pile up. Then use magic to handle the repeated tasks you already recognize.
For normal clears, choose magic that keeps books organized. A route tool that groups, sorts, or reveals destinations can save more time than raw movement because it reduces the number of wrong trips. If you repeatedly stand with a mixed stack and no clear next shelf, prioritize information or sorting help. If your piles are already clean and your shelf choices are quick, movement or automation becomes more valuable.
For timed badges, magic order becomes stricter. A 1-hour attempt cannot afford repeated re-reading of the same floor pile. Use magic early enough that it changes your entire route, not late after most shelves are already done. If a magic upgrade affects only a small endgame cleanup, it is not your first speedrun priority. If it lets you identify or place books faster for the whole run, move it earlier.
For no-magic or Pro Mode goals, study magic even when you cannot rely on it. Knowing what magic normally fixes tells you what you must do manually. If magic usually handles messy piles, your no-magic route needs cleaner staging. If magic usually helps find shelves, your no-magic route needs better label reading and zone memory. The best no-magic players often look organized because they are replacing ability effects with disciplined routing.