Cost caps are the runtime's defence against the horror story of an unattended agent burning hundreds of dollars overnight. A turn_end hook checks session.cost_cents against your ceiling and gates further turns when it crosses. Pairs naturally with a notify hook to your ops channel so you know it fired.
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.