Situational Leadership...

• Agile project management is more about leading a team than managing a team (Cohn).
• Understand what the team needs in terms of leadership.
• Servant Leadership is more about Leadership than being the doormat of your team.
• Agile leadership is situational (depending on the set of circumstances).
• Agile works because the team is empowered - a lot of responsibility is delegated to the team (Mackenzie).
• Situational leadership is recognizing that there is no right way of leading a team, but effectively bounce between the following styles:
• Directing: Tell the team what to do
• Coaching: Sell an idea so the team will do
• Supporting: Work along with team to do
• Delegating: Delegate to team to do

Map the above with Tuckman's phases of team development - Forming, Storming, Norming, Performing, and Adjourning. You may start with a Directing approach as the team forms, and gradually as the team matures, coach, support and finally delegate.

Agile works the best when the team is in the "Delegating" Mode.