The agents in space cannot be warped-to by right clicking their name and location in the Journal window like agents in stations.
For example, If I were running a mission for Ansbivand Boe
, in the mission Journal it lists his name and location in a hyperlink format. If I have completed the mission I can right-click his name and set it as a destination, and then, upon being in-system with his location, I can right-click his name and dock at that station.
When running agents in space missions it will display their name and the ship they are in, for example - Jannegiers Estacan's Tristian in Audaerne
. I can set a destination by right clicking his location, but then when in-system that hyperlink is to the system, not the agent, so it cannot be warped to via the journal.
I realize that this is because the agents in space are linked via their solar-system in the journal, not a bookmarked location. This would be one of many fixes to COSMOS missions that would make the experience better.