Using Jev to route reasoning effort at each agent step

vechen @miu21590Originally posted 2026.09.22

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Inspired by Ares paper (https://arxiv.org/abs/2603.07915), which used a fine-tuned Qwen3-1.7B to pick reasoning effort before every agent step. Same idea, but Jev is a much better fit for this control loop: fast enough that the routing overhead is basically invisible. It’s especially practical now that Astra and the latest Claude models can change effort mid-conversation without invalidating the prompt cache.