Your comments

We'd also be happy with a URL blacklist for suppressed preview images.

A combination of enabling/disabling link previews via API and UI with such a list of "disable by default" URLs would be perfect.

This is really annoying: With every link we post in a message, depending on the target URL, a giant preview image is added.

We would very much welcome an option to switch off auto-augmented messages.

The API already has arguments like `"isEphemeral": true` and adding `"createPreview": false` would be nice.

This could also be exposed in the "send message" area of the UI.