System One models like Jev take on supervision in agent harnesses
The author lists roles for Jev in agent frameworks: supervising long-running workers, detecting stuck or drifting agents, evaluating progress, routing models and tools, filtering context, vetting tool calls, and triggering retries or human review.
System One models like Jev will have a critical role to play in software factories and agent harnesses. Where you’ll see them: - supervising long-running workers - detecting when agents are stuck or drifting - evaluating progress and completeness deciding when work needs verification - routing between models, tools, and workers - filtering context before expensive inference - evaluating tool calls before execution triggering retries, escalations, or human review Frontier LLMs will still do the expensive, open-ended work, but these fast decision models will make thousands of smaller judgments around them.