@Ruan-Barros, it looks like it added the Gnome Editor command the first time, and the second time it found that Gnome Editor is the only foreground command in you commands.json file so it didn't need to add anything new - Gnome Editor was already added to your computer in your account. You're running the agent in foreground mode so it will ignore any commands with ground = background.
If you click the green Trigger button for Gnome Editor it will probably try to run it. You should see that in your agent output.