What it is
A small Go gateway that exposes TypeSafe's Jev model through the Model Context Protocol, forwarding each caller's TypeSafe API key to the System One API for MCP clients such as Codex and Claude Code.
How it uses Jev
It exposes four MCP tools: jev_noul for yes/no probability, jev_choice for one option with probabilities and confidence, jev_score for a probability-weighted score across ordered levels, and jev_evaluate for several named questions in one request. Requests carry state, model (default jev-latest), and typed questions.
Primitives:choicescorenoul
Technique worth stealing
Forward each caller's own API key per request without storing, logging, or sharing keys between sessions.
Try it
docker compose up -d --build, then curl http://127.0.0.1:8080/healthz
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-centricyes0.95
- Shows a System One patternyes0.68
- Handles uncertaintyno0.05
- Measuredno0.04
- Runnableyes0.95
- Worth recommendingno0.30
- Model replicano0.03
- Problem scopescore on a 0–2 scale1.01
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.