Air carrier Flight Attendant reported the gate agent attempted to open an armed door which caused the door to disarm. The escape slide did not deploy. Flight Attendant suggested maintenance personnel told gate agent to open door before cabin crew was notified.

Narrative

About a minute after door closure and arming; a gate agent attempted to open the door from the outside. In doing so; it disarmed the door; but she did not OPEN the door; she walked away from it. FA A; whose door it was to arm; immediately contacted me to tell me. I went back and saw the door was disarmed but the red streamer was still in place; then I looked through the assessing window to see the agent shaking her head and walking from the left side of the jet bridge to the right. I called the captain from 2L to see if he knew of any reason why the agent would be attempting to open our door. He did not but said he'd make a call. I instructed FA A to arm the door again so that all doors were properly armed. I watched and crosschecked her. I then noticed a comment in the app that maintenance wasn't done and needed to reopen the door. I called the captain and he said OK.But it was news to him. I instructed FAs to disarm and cross check. The door was reopened. Maintenance came on for just a few minutes then left. Doors were armed and crosschecked again.Sometimes I think maintenance tells the agents they aren't finished and need to reopen the door before any of the crew knows about it because after door closure; we immediately are arming and disarming. NOT looking at our app.