There is a user command and an admin command called "limits". Admins can check the limits of a specific island owner. Both show a GUI panel with the limits and the current count.
This section lists the maximum number of blocks allowed for each block material. Do not use non-block materials because they will not work. The limits apply to all game worlds.
### worlds
This section lists block limits for specific worlds. You must name the world specifically, e.g. AcidIsland_world and then list the materials and the limit.
Some items cannot be limited (right now). The reasons are usually because there are too many ways to remove the item without it being tracked. If you are a programmer and can work out how to fix these, then please submit a PR!