If your bot is a cleric, lvl50 and you "#bot update" 'd him, it should cast the lvl44-49 cleric's spells.
If you want to see what spells your bots can use, you have to see on what spell's ID it is. A magician by example should by 516 (by memories). Then you can check what spell your bot should cast by checking in the database, the npc_spells_entries table.
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