I am debating purchasing the app for MacOS and iOS, but i am wondering if i can add invitees for a calendar invite made in the agenda app itself? can i accept or decline invites through the app as well ?
Things that might be helpful to know (Agenda version, OS and model, etc): iOS and MacOS
… In that case would the note (as a text or a link) be visibile to the invitee?
Yes, in that case the link will be visible to the invitee (unless you remove it first in the Calendar app), but obviously if the person you invite tries to click it it will not show your note as he/she doesn’t have access. At most it will start Agenda if the person has it installed. The event doesn’t have the note’s text.