When repairing (combining) tools in your inventory in survival mode, you can obtain an infinite amount of tools. This does not use up the original tools either.
MC-47317
Item Duplication Glitch when Repairing Tools
Resolved
Duplicate
0
53rd Duplicate of MC-46715 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.