I have Iron longsword dressed. I open equipmentTab, and then call getItemInSlot() or getItems(). getItems() returns zero array, getItemInSlot returns null. So, how can I check what weapon I'm wielding?

it does. look at this: http://osbot.org/api/org/osbot/script/rs2/ui/EquipmentTab.html

Nope, I tested it and seems that weapon in slot is not detected. I know about API reference.

if you are developing scripts, i would recommend using OSBot 2. As i can confirm equipment works on OSBot 2 as OSBot 1 will be redudant soon. If you want help, post your code and ill see what i can do

Edited June 7, 201411 yr by precise

It's been the same as it's always been: 

equipmentTab.getItemInSlot(EquipmentSlot.WEAPON).getName();

I've been using this for the past 3 weeks and it hasn't broken once, definitely working.