Can spells like Sacred Flame and Chill Touch be used against a creature on the other side of Leomund's Tiny Hut?
The wording of the spell states "Spells and other magical effects can't extend through the dome or be cast through it."
Spells like Sacred Flame, Chill Touch, Wall of Fire and Dimension Door do not need to be cast through anything. These spells don't need to travel, the effect is simply appears at the target.
I think that that RAW, the answer is yes. RAI it would be no since the spell is intended as a safe place to rest. What do you think?
Best Answer
tl;dr: No. For several reasons, below:
1. The spell wording:
If the caster is outside and the effect is inside, it has been cast through the barrier. The spell wording forbades it.
2. Cover:
Most spells cannot be cast if there is even a glass window between caster and target point.
The hut barrier, even if you could see inside, grants total cover. And finally...
3. You cannot cast into what you cannot see:
Therefore, anyone outside cannot see inside the hut, and cannot cast targeting inside, since you need to see the target. Even if the particular spell does not require sight, you would still need to find out on which of the 12 spaces inside the hut the target is.