You can now give players Knowledge Books (in 1.13) containing any custom Magic crafting recipes. When a player uses these books, the recipes are added to their recipe book.

Changelog:

• Add "as_percentages" parameter to CheckHealth action, to use percentages instead of raw health values.
• Add "/mgive recipe:wand" (or "recipe:*") item style, for giving recipe knowledge books (1.13 only)