Start a mission and abort in mission area. You should get a warning that you have 30 secs left till agents arrive. At the end of the timer you will get an agent.
Each player gets their own agent. So if there is 4 team members in the mission area 4 agents summon.
Now to avoid dying climb up a pipe so you're halfway from the ground and roof. If you do it right the agent cant hit you and others can gank him .
Also I'm not sure but I think agents still die when you leave the mission room and sometimes drop info. But since the new patch I havent seen their corpse yet.
And one last thing. To get the info from the agent you killed, just get a mission in the same room on the same floor.
The last time i remember, the agents drop random amounts of info. The highest I ever found was 300k. And a couple of times i seem to be able to re-loot them over and over.