JEV 101 / THREE LANGUAGES / ONE COMPLETE WORKFLOW
Learn Jev by following one decision from a customer message to a safe action.
A parcel is marked delivered but missing. Which team handles it? Is it urgent? When should a person step in? Start with the worked example, then build your own typed decision.
从“包裹显示送达却没收到”这条工单入手，循序学会 Jev 的 state、Choice / Score / Noul、API 返回值与人工回退。
“My parcel says delivered, but nothing arrived. I need it today.”
Illustration only · No API call on this page
What Jev decides
Learn when a typed judgment helps, and what ordinary code must still own.
Read the introductionOne complete ticket
Trace verified facts, three atomic questions, illustrative answers, six failure cases, and launch checks.
Open the worked exampleMake a draft
Use a local, no-key lab to create a copyable request and a human fallback plan.
Try the decision labSTART WITH THE REAL QUESTION
Jev returns decisions your code can read. It does not write a customer reply or grant refund permission.
Choice picks from named options. Score rates a defined rubric. Noul reports a statement probability. The guide shows where these results belong in a workflow, how to inspect uncertainty, and what to test before automating any action.
Independent learning site; examples are illustrative and are not results from an API run. Official TypeSafe documentation