Does the AGPL license allows not disclosing the source of third party scripts (in)directly interacting with the main software?

Let's say I use some AGPL software like Mastodon or Gitea. If I write a script to interact with some elements, like a nodejs script that interacts with the messages posted to act as an antispam, is it considered derivative work?

If I use a custom theme, does it have to be AGPL? If I add an overlay over the interface or interact with Mastodon through JS, does it have to be AGPL?

For Gitea, if I make a script to scrap some visual elements and send it by email to some people, does it have to be AGPL?

For an email software like Mailcow, if I write an antispam script that communicates with Mailcow's API, does it have to be AGPL?