🚀 go-pugleaf

I think probe pads should be kept out of the core if possible. In some 
cases, such as automatic placed and routed systems, it is more convenient
to use a probe pad cell and let the cell be routed by the P&R tool.

If you are doing a hand layout, put the pads outside the core. Make them 
50x50 or slightly larger. The size really depends on how much practice
you have probing etc. I prefer the pads to be outside the core and 
somewhere in the 70 - 100 microns square range. This way I have quite
a bit of space to work with and I'm not worried about destroying something 
while moving the probes.

Yoo Ho Cho