Personally - I think any bot that could be straight Lemmy functionality shouldn't exist but that said, I think good ground rules would be :
- Bots should be clearly prompted by a command
- Bots should not act in a community without mods from that community being contacted first
- Bots should minimize the space they take with their messages (Example: Info on how to contact its creator should be in the bot bio rather than in every message)
- Bots should say who made/hosts it