What it is
A Python decision gateway and stdio MCP server that exposes TypeSafe's Jev model through OpenRouter's alpha decisions endpoint, letting coding agents obtain typed probabilistic judgements for small bounded questions.
How it uses Jev
Jev makes typed decisions on caller-supplied state: Noul for yes/no propositions, Choice for closed label sets, Score for ordered rubrics, and multi-question evaluation. Results are returned as calibrated probabilities, labels, or expected scores, and the caller applies its own action policy.
Primitives:choicescorenoul
Technique worth stealing
Expose a probabilistic judgement model as MCP tools so agents can request calibrated decisions instead of free-form text.
Try it
Install with uv or pip, set OPENROUTER_API_KEY, then run examples/demo_openrouter_decisions.py or configure the MCP server.
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-centricyes0.89
- Shows a System One patternno0.35
- Handles uncertaintyno0.08
- Measuredno0.06
- Runnableyes0.97
- Worth recommendingno0.25
- Model replicano0.04
- Problem scopescore on a 0–2 scale1.28
- About Jevyes0.99
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 21 Sept 2026.