What it is
JevFlow is a TypeScript library for backend developers to define typed probabilistic judgments (noul/score/choice) and compose them into deterministic threshold workflows that return an ordered, explainable action set instead of side effects.
How it uses Jev
JevFlow uses Jev/System One as the default provider to evaluate declared decisions on input state. The provider batches independent decisions into a single systemOne request, returning calibrated probabilities, scores, or choices that workflows compare against explicit thresholds to produce matched rules and actions.
Primitives:choicescorenoul
Technique worth stealing
Separate probabilistic model answers from deterministic policy thresholds, returning an inspectable action plan rather than executing side effects.
Try it
pnpm add @jevflow/core @jevflow/provider-jev; set TYPESAFE_API_KEY; run pnpm examples:payments for a deterministic mock example.
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.73
- Shows a System One patternyes0.94
- Handles uncertaintyno0.28
- Measuredno0.05
- Runnableyes0.90
- Worth recommendingyes0.63
- Model replicano0.03
- Problem scopescore on a 0–2 scale1.50
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 23 Sept 2026.