Not sure what is wrong with this datapack, but it doesn't work on my server. I took it from the source code, and the only thing I changed was renaming item to items as I am using 1.20.1.

Parry.zip

Datapacks need pack.mcmeta file.

https://minecraft.wiki/w/Data_pack
https://minecraft.wiki/w/Tutorial:Creating_a_data_pack
https://github.com/Xires87/SwordParry/tree/1.20?tab=readme-ov-file#datapacks

I have added that file, but still doesn't work. Im very sorry to be bothering you, but I don't know what else to try. And to let you know, Im trying to remove the ability to block from weapons that have right click functions.

Parry.zip

Thanks for helping

Thank you, Ill try to figure it out

Would be nice if there was a example datapack that could be downloaded, but maybe there is and I don't see it.

test.zip

This doesn't work either.

Sorry, I'm not going to teach you how to create and install a datapack. There are multiple tutorials that clearly describe it.

The datapack I've sent is a working example that I was using to test the system. All you have to do, is to install it properly and change values in json files.

Good luck ;)