Jev Playground

September 17, 2026 · View on GitHub

A small Next.js app for experimenting with TypeSafe AI's Jev model (System One). Paste a state, build any mix of noul (yes/no probability), choice (pick from options), and score (rate against a rubric) questions, and see the typed answers, probability distributions, and confidence in one shot — all questions are evaluated in parallel in a single request.

Jev Playground

Setup

  1. Get an API key from the TypeSafe console.

  2. Put it in .env.local:

    TYPESAFE_API_KEY=ts-...

  3. Run the dev server:

    npm install
npm run dev

  4. Open http://localhost:3000, hit Load sample for the docs' support-ticket example, then Run (or ⌘↵).

Plain text state is sent as a string; valid JSON is sent as structured state (see the State docs).