One team’s ground rules:
No creepy stories (i.e. Don’t let more stuff “creep” into a story than defined in the acceptance criteria)
Set up early for demo and prepare
Never ignore anything! (Such as bugs “solving themselves”).
We never say “no”. We say “sure, just chuck it on the product backlog. It’ll get prioritised later.”
Be on time for meetings!
Make sure everyone gets heard
Another team’s ground rules:
Each sprint must have a goal
Stay focused on the goal / top stories
Make sure daily goals are clear (we know the steps we need to take to achieve them)
We make decisions together
We email documentation to everyone in the squad
We need to show what we have done to the business people impacted, not just our product owner (when appropriate)