Tok'ra Infiltrators were deep cover agents that would risk their lives and risk the wrath of the Goa'uld by infiltrating the domains of the System Lords, on some occasions by being right under the nose of the ruler. This would be done either by masquerading as a Goa'uld, doing reconnaissance for a future missions or participating in a strike against a Goa'uld facility. They did these missions carefully for the slightest mistake would often result in their death.
These infiltrators were patient and cautious individuals as they were vital to the Tok'ra for they provided the necessary information as well as resources to their kind. (RPG: "Friends and Foes: Stargate Season Two")