Perimeter action ships were minimally-crewed (no more than 50), short-mission vessels built for high-warp military engagements. They combined aspects of 20th and 21st century submarines, PT boats and airborne strike fighters.
Classes of this type of vessel included Kiaga-class and Agilis-class starships of the Four Years War era; and the later Akyazi-class, Engage-class and Kirsanov-class. Ca. 2290, a Dupleix-class perimeter action ship underwent trials; in contrast to earlier classes, Dupleix massed 123,000 tonnes and carried as many as 311 personnel. (Starfleet Prototypes)
USS Arauca was an Akyazi-class perimeter action ship. She was destroyed by unknown threat forces in 2289. (Ships of the Star Fleet, vol. 2) Years later, after the recovery of the decades-lost USS Accord, Starfleet deduced that the threat forces had been Cardassians. (Star Trek: Accord)
- The 24th century Saber-class starships were said to be part of the Perimeter Defense Directive (Ship Recognition Manual, Volume 1: The Ships of Starfleet) but they seem to be capable of much longer duration missions than many of the perimeter action ships of the 23rd century. Perhaps the definition of perimeter action ships changed or the type was eliminated from the inventory, as none of the type are mentioned in any documents found past the early 24th century.