Quote Originally Posted by airless_wing View Post
Q:348
Assuming a Pact of the Chain warlock with the Voice of the Chain Master: If you see an enemy (not in cover) through your familiar's senses, can you make a ranged spell attack against that target from your position? (Assuming you have the range to hit the enemy, of course)
A:348 Generally no, but not entirely.

It takes your Action to look through your familiars eyes, and you can do so until the start of your next turn.

So any spell that requires an Action to cast is not available; BUT, there is wiggle room for a Bonus Action Spell to be used, like Misty Step, though.

Also, if you have the Metamagic Quicken (or similar ability) you could pull off a Bonus Action offensive ranged Spell Attack npnp.