I'm developing a mod pack which includes Copper Tools.
Unfortunately a Copper Hammer is missing.
Would you be able to add a Copper Hammer?

Thank you,
Guinaro

Which mod adds the copper tools?

The mod adding all the tools is:
Everything is Copper by LobsterJonn
https://www.curseforge.com/minecraft/mc-mods/everythingcopper

Is it reasonable to add copper hammer to the mod? In vanilla there are no copper tools anyway.
Maybe you can custom a copper hammer in your modpack using KubeJS or something.

Unfortunately, the mod is All Rights Reserved. I suggest going the KubeJS route and making your own tool. For Ex Deorum to treat it as a hammer, make sure to add the hammer to the #exdeorum:hammers item tag.