I double checked the publish date before writing down this comment. Because I use the same harness (Opencode, to be specific) as the author, and some of the features are just right there. Like opencode can start multiple subagents for different tasks in parallel. Also I usually ask the main model (e.g. opus 5.5) to pick subagent models for me, and it has no problem identify the difficulty of work and delegate large portion of them to gpt-luna.