In strict Jain gochari for monks, agar-agar is generally not considered suitable.

Reason:

• It is a processed additive, not a simple fresh alms food.
• It is derived from seaweed/algae, which many Jain monastic traditions avoid in practice.
• For monks, food is usually expected to be plain, simple, and in line with very careful ahimsa discipline.

So, unless a specific Acharya or tradition has explicitly permitted it, it should be treated as not allowed for gochari monks.

If you want, I can also explain this according to Digambar or Shwetambar practice.