The Long Horizon Stack

​Long-horizon agents execute multi-step work over hours or days: planning and acting, self-correcting, coordinating with humans and other agents, and recovering across many tools and sessions. The capability is there in theory. Deployments are early but growing fast, and a new infrastructure ecosystem is being built to support them.

​Heavybit's DevGuild: Long-Horizon Stack is a one-day, invite-only gathering of 200 founders, engineering leaders, and AI researchers building the systems that take agents from order takers to outcome owners.

​Speakers include Tony Gentilcore (Cofounder, Glean), Caitlin Colgrove (Cofounder/CTO, Hex), Rob Ferguson (VP Technology and Strategy, Fireworks), and Mudith Jayasekara (Head of Model Training, Baseten), on durable memory, orchestration, self-improving harnesses, secure sandboxes, observability, identity, governance, and the token economics of agents that never stop.