"Leaders are tool builders" reads like someone trying to convince themselves of their own marketing hype. It's a generalisation that certainly doesn't stand up to scrutiny. Martin Luther King, for example, was a leader, and he's not known for his tool-crafting prowess. Some leaders create tools. Some people who aren't, or wouldn't consider themselves to be leaders, make tools.
With that in mind, was Dr. Martin Luther King a tool builder?
His area of focus that he's most known for is civil rights.
He created, and taught, strategies for non-violent protest, strategies for bringing disparate communities together so they had a louder collective voice. He crafted speeches that inspired people of all walks of life at the time, and continue to inspire 60 years later (His 'I have a dream' speech was in 1963), and I think will inspire people at least another 60 years. He treated all people equal. In his later years he spoke out against the Vietnam War. and called for a bill of rights for all Americans. The very pattern of his life is a tool, a model for young men in how to behave, how to protest, how to live.
While many, many people worked toward this goal - a great portion of the credit goes to Dr. Martin Luther King for the Civil Rights Act in 1964 and the Voting Rights Act in 1965.
I would count myself as have lived a great life as a leader if at the end I have achieved a tenth of the tool building Dr. Martin Luther King did.