randyjawa 

I, too, have broken a freewheel tool or two. Snapped in half, exactly like the OP's. I have also managed to round off the tabs on a two tab freewheel tool and had several bikes come my way with the two tap/slot ruined due to slippage. These days, I employ extreme caution when removing two tab freewheels and, if possible, try to avoid having anything to do with them. Four tap, OK. Splined, just great unless dealing with the kind that won't fit over the axle nut.

I have also gone the pipe wrench route, disassembling the freewheel and then fitting my 18" pipe wrench onto the bare freewheel hub. I used to be worried about the pipe wrench jaws damaging the hub but, so far, no worries.