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PrimitivesStructured criteria

Structured instructions

Putting the question in one field and its supporting data, examples, or focus notes in others instead of one long string.

Category
Primitives
Also known as
Structured criteria
Related terms
5
Directory entries
2
Docs
docs.typesafe.ai
Added
2026-09-24

Definition

Instructions and criteria accept objects and arrays. Structure helps when a question needs context or examples, when part of the question comes from your code, or when several questions share similar wording and need distinguishing data.

Common patterns include question plus focus, question plus compare (two state paths to contrast), and criteria entries with what, not_for, and examples. Keep a short, unambiguous question as a string; add structure only when it separates guidance that would otherwise blur.

Tagsprimitivesdesign

From the directory

Instructions, option descriptions, score levels, and noul criteria all accept JSON, so you can label question parts, pass schemas and taxonomies, and keep candidate paths alive.
Practices & PatternsDocs#official#primitives#architecture
Official
Design AI-powered software by keeping code in control and giving System One narrow, structured decisions to make.
Practices & PatternsDocs#official#patterns#architecture
Official

From the community

Posts from builders shipping with Jev right now.

Follow @typesafeai

Predictive spreadsheets

Another crazy @typesafeai Jev example: Predictive spreadsheets Spreadsheets recalculate numbers, not meaning. Jev reads intent. Type "Urgency" at the top of a column and, as you type, it figures out you want each row rated from "no follow-up needed" to "urgent" in ~100 ms.

nader dabit
nader dabit
Cognition
@dabit3

Also have been playing with @typesafeai Jev, insane! So many immediate use cases and new apps are possible. What a time to be a builder! Sharing some experiments here starting with: Keystroke oracle / predictive launcher: Your launcher ranks by aliases, fuzzy match, and

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The compaction plugin, in Chinese

连 JEV 的联合创始人 @CompleteSkeptic 都亲自下场转发点赞:这是 JEV 正确的打开方式! 大家在 Claude Code 里写长代码,最恶心的就是上下文一满,系统就卡住 10 秒去写总结小作文 开发者 @tamarajtran 刚刚开源了这个插件:利用 JEV Show more

tamara
tamara
@tamarajtran

found the perfect use case for @typesafeai Jev: instant compaction in 2026, why is compaction still a summarization prompt? Jev can make it instant by scoring every tool call and dropping what’s irrelevant

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WTF is Jev, and 9 things people are building

TL;DR of my new article: WTF is Jev by @typesafeai, and the 9 things people are already building with it. The thesis: 𝗮 𝗰𝗼-𝗰𝗿𝗲𝗮𝘁𝗼𝗿 𝗼𝗳 𝗖𝗵𝗮𝘁𝗚𝗣𝗧 𝘀𝗽𝗲𝗻𝘁 𝘁𝘄𝗼 𝘆𝗲𝗮𝗿𝘀 𝗶𝗻 𝘀𝘁𝗲𝗮𝗹𝘁𝗵 𝗼𝗻 𝗮 𝗺𝗼𝗱𝗲𝗹 𝘁𝗵𝗮𝘁 𝗰𝗮𝗻𝗻𝗼𝘁 𝘄𝗿𝗶𝘁𝗲 𝗮 Show more

Matt Van Horn
Matt Van Horn
@mvanhorn

x.com/i/article/2100…

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Voice-controlled computer use on a Mac

The use cases Jev unlocks

19 open-source Jev projects

一个只会做选择题的小模型,能长出多少玩法? TypeSafe 的 Jev 就是这么个东西:给它最多 255 个选项,几百毫秒挑一个,再附一个校准过的置信度,输出 token 免费 结果开发者们已经拿它做出了 19 个开源项目,加起来 6800 多星 挑几个最有意思的 jev-ultrafast,browser-use 出品,2700 星,一句 Show more

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