hello @JeremyECrawford if our druid created a magic pebble via the cantrip. could I attach it to an arrow and fire it from a bow. I am a black smith so I could craft an arrow head to help this

— Angus Davidson (@angus_davidson) January 12, 2018

Spells officially do only what's described in their text. However, players often come up with creative, alternative uses, which DMs are responsible for adjudicating. I encourage a DM to say yes to such uses when they're non-disruptive and fun. #DnD https://t.co/6KTSZVB8xb

— Jeremy Crawford (@JeremyECrawford) January 12, 2018