meaning of "good guy" letter

"good guy" letter meaning in Insurance Dictionary

Letters that sureties provide to numerous prospective obligees in link using prequalification process, which really suggest that the main is a merchant account of the surety. They usually try not to say just what the personal line of credit is. But they may state that the principal has the capacity to acquire a bond for the identified project or the principal has the capacity to acquire a relationship up to a stated amount.