SDKs & clients

jevalyn

@Ray-Hughes3RubyMITupdated 2026-09-20runnable

The decision layer for your Rails app. A Rails-native wrapper around TypeSafe's Jev System One API: typed, calibrated decisions in your control flow.

Ray-Hughes/jevalyn

Where it calls Jev

# Thin, honest wrapper over POST /v1/systemone. It mirrors the HTTP API one-to-one:

lib/jevalyn/client.rb:7

The link points at the commit we read, so the line number still holds.

What it asks Jev

These question sets are lifted from this project's source exactly as written.

from spec/jevalyn/cassette_spec.rb:48

  1. urgenttrue/false

    Is this urgent, really?

Run it on your own text

The code
import { experimental_evaluate as evaluate } from 'ai';

const { answers } = await evaluate({
  model: 'typesafe-ai/jev',
  state,
  questions: {
    urgent: { type: 'boolean', instructions: 'Is this urgent, really?' },
  },
});

Other projects in this category