Without a turn cap, an agent can loop forever (and bill forever). The default on Digitorn is 25 turns per session, configurable per agent. When the cap hits, the runtime stops the loop cleanly and returns whatever partial result the agent had. Behaviour rules can also raise warnings before the cap fires.
Engineering notes from the Digitorn team. No marketing, no launch announcements, no "10 prompts that will change your life". Just the things we write that we'd want to read.