Factory just shipped Missions, their take on long-horizon software agents. Rather than trying to stretch a single context window across a multi-day project, they use an orchestrator-worker model: a planner breaks the goal into milestones, then spins up fresh worker sessions per feature, each with a clean context and a specific scope.
It really bothers me that it doesn't have support for devcontainers.
Only a closed set of languages are supported and the hook for startup installation of additional software seems to be not fully functioning at the moment.