I am unable to create or make a Masterwork Tool. A Masterwork Tool is a catchall mundane item to get a +2 circumstance bonus on any skill check.
For reference: http://www.archivesofnethys.com/EquipmentMiscDisplay.aspx?ItemName=Masterwork%20tool
The item can be found in Core Rule Book and Ultimate Equipment. I have tried utilizing all sources and Pathfinder RPG Core Supplements preset.
This should be similar in function to how Masterwork Tools can be made in 3.5. https://groups.pcgen.org/viewtopic.php?f=16&t=303 In my opinion, it would be a item called Tools, Masterwork worth 50gp. By itself it does nothing but then you have to customize it. When you click customize it opens the menu where you can choose which skill that you want the +2 in. Then you can equip the item if the circumstances fit to get the bonus. Just like how the Climb Kit gets you +2 to climb. In reality you are not suppose to have it on 24/7 but when you have time to set it up.
For more background of this request: https://groups.pcgen.org/viewtopic.php?f=9&t=1196&sid=9e34875378c38745296cf4d1f770f070
+1 for Masterwork tool