Could you push `client.team(team).name` into a private helper method, so we have how the team name is derived from the client in just one place? You'd then call it like `listener.user_added_to_team(username, team_name(team))`.

I'm also considering whether we should pass both the team name, id (and/or URL?) to the listener, so we can do more detailed/useful presentation in HipChat. Anyway, just rambling at this point!