Are writing tools/forms basic (quill, biro, important documents are still sealed with wax, or worse, blood etc) or equivalent to computers and so on? Can anyone write? What is the literacy rate of your fictional populations? If it is low, is anyone trying to improve it and what motivates them to do so? Do they have the backing of your world's government(s)?
Is writing encouraged or not? Is the focus on stories or on non-fiction? What happens to any writer daring to break your fictional world's rules?
Writing in the magical world should not be limited to just spell books I think. There should be some sort of history of your world, residents ought to be aware of at least some basic geography of the planet they live on and a working knowledge of the habits of dragons etc can help promote better life expectancy!
So who writes these books? What repercussions do their books have on those who read them (for good or bad)?
In my Fairy Kingdom the classic fairytales are considered to be classical culture. What would count as that in your fiction?