Should I turn my spell into a spell jar

Not a yes/no — the cards put the question somewhere the yes/no wasn't.

Past: Three of Pentacles, reversed. The working came to you through a chain — someone made it, taught it, handed it on with its materials. Reversed says you're holding a piece of that chain, not the whole of it: some instruction, some herbs or oil or paper, and the rest reconstructed.

Present: The Moon, upright. This is the seat that decides your question. A jar is a container that seals a thing shut and keeps it sealed — and Moon is fog, ambiguity, the part of a working you cannot see into or verify. Whatever the jar would "keep," you'd be keeping it in the dark, and you'd be the one no longer able to read it.

Future: Four of Swords, upright. Under that condition the trajectory is a halt, not a lengthening. Four of Swords is a work put down and left alone — cessation, stillness, deliberate suspension. Not punishment; but it isn't the long-burning continuity you're shopping for.

The conditional: if the jar's contents and the written instruction are genuinely in your hands — you have the recipe as it was given to you, and every item is the item itself rather than your read of it — then this spread describes a working that stops and rests, and you'd be the one choosing when it rests. If the instruction is from memory or second-hand, and the jar would be assembled from substitutes, then what Moon is naming is the sealing of an unverified thing, and the honest move is to go back to whoever handed you the work and confirm before anything is closed in a jar.

Action: before you assemble anything, write down every item and every instruction this working requires exactly as you received it, then lay out what you actually have and mark each line as *exact* or *substituted*. That's the Moon's fog made into a list you can look at — and it's the one thing in this that the cards can't supply for you.

Would you like the three-card spread drawn as a picture, or this reading kept in your journal?