Question 1

What is Ordo and what does it do?

Accepted Answer

An open-source decision engine written in Rust. Models and scores say what is going on; Ordo decides what to do about it with rules that carry tests and versions, and it shows which decisions a change moves before you ship.

Question 2

How does Ordo relate to Jev?

Accepted Answer

The README positions Jev as the model that reads text and returns confidences — is this a refund request — while Ordo owns the policy: refund windows, amount limits and thresholds such as the if jev.confidence > 0.85: refund(order) example written without review or a test.

Question 3

Where do Ordo rules live?

Accepted Answer

In their own JSON or YAML rule files, in git next to your code, so they can be reviewed and diffed. The expression language is bounded: no loops and no side effects, so human-written and AI-written rules can both be checked.

Question 4

How do I test a ruleset?

Accepted Answer

Every ruleset carries its own tests, and ordo test runs them locally and in CI. The README excerpt is truncated here, so the exact CLI install path is not shown; badges list an npm package named @ordo-engine/cli.

Question 5

Does Ordo need a Jev API key?

Accepted Answer

The README does not say Ordo calls Jev itself. It frames Jev-style models as the upstream decision source and Ordo as the layer that turns their outputs into tested, versioned policy, so Ordo's own documentation is the place to confirm runtime requirements.

Question 6

What makes it safe for money decisions?

Accepted Answer

The README says money is exact decimal, inputs are declared with types, and bad input is rejected before any rule runs. Rules are bounded with no loops or side effects, and every ruleset ships with tests you can run before shipping changes.

Question 7

Who builds Ordo and under what licence?

Accepted Answer

Ordo-Engine maintains the repo: 38 stars, 9 forks, MIT licensed, created 2026-01-07 and last pushed 2026-10-14. It targets Rust 1.83+, publishes a CLI to npm, and links documentation at docs.ordoengine.com plus a Discord server.

Ordo

Highlights

Questions about this entry

From the Jev guides

From the Jev AI model community