Add permission node for "/callback".

[Mickey42302]

No description provided.

[Malfrador]

I am a bit concerned about this, as its API functionality. A plugin would expect its clickable text to work properly, without checking for permissions first. It would be really confusing for users too as its not immediately obvious this permission and command are related to clickable text of some other plugin.

Additionally the command can be replaced in 1.21.6 anyways, as Mojang added a way of adding custom click events that does not rely on commands.

[Machine-Maker]

I don't like this at all. Why would a server want to disable this command for anyone? It just is going to end up breaking plugins that use it.

[Malfrador]

Would setting the permission node to "true" by default for all players prevent that issue?

That would essentially be a requirement, otherwise API would be completely broken unless server owners explicitly give permissions for it.

But I don't really think its worth adding this.
1.21.6 is releasing soon, and the custom click action and its dedicated packet are a much better way of implementing the callback functionality than the command. I would expect the command to get removed as soon as Adventure updates the ClickCallback to that, essentially solving this issue.
And just adding this for 1.21.5/.4 which will soon be unsupported really seems a bit useless.