AThousandShips
commented
2 months ago I'd say this is explained in detail in the earlier page that you are assumed to have read when you reach the other page, repeating ourselves in every page isn't helpful IMO, especially when it explicitly links to it:
See Making plugins guide to set up your new plugin.
Godot 4.2.2 stable
The Inspector Plugins guide has a tiny confusion.
Problematic URL: Inspector Plugins
To my own embarrassment, I found this documentation to be confusing. The problem is under the first header of the Inspector Plugins page. "plugin.gd" is the default name of the script whenever you use the Create New Plugin dialog - but most people will overwrite this default name immediately. It's easy enough to infer what is being asked of the coder, but still.