[yf49]

I look at the important people in the team besides the leader. What do they have on their resumes? Are they competent? And how long has the team been together?

If there are competent people, but there is a lot of churn happening, or there are incompetent people who have been around long, something usually isn't working.

Good people always have options to leave. And if they have hung around (my random number is 2 years atleast) its a good sign to me, that its a healthy team.