Who decides what: the model, the rules, or the author?

Code owns rules, numbers, and state while Jev judges in-world decisions and a separate authoring thread writes world content. The client renders glyphs on 3D terrain.

Has the core risky bet been tested yet?

One spike tests whether Jev judges social fiction like people do, with most checks passing and one narrow miss. The other spike tests whether the world database holds as the server.

What setup and keys do I need to run the scaffold?

Install dependencies and run the lint, typecheck, and test commands. Only the spike needs a TypeSafe key; later generative calls go through a subscription login instead of an API key.

Is the spec stable enough to build against?

Correct. The design document is the source of truth and planned packages are added when their milestone starts, so expect interfaces to move.

What state is the repository actually in?

Scaffold only. Two spikes gate everything else: the m0-jev spike on whether Jev judges social fiction the way people do, and the s0-spacetimedb spike on whether SpacetimeDB holds as the world server.

How do I run the checks?

Install with pnpm install, then pnpm check runs lint, typecheck, and tests; pnpm test runs the Vitest suite once, pnpm typecheck checks every package, and pnpm lint runs Biome. It needs Node 22.18 or newer and pnpm 11.

Do the generative calls need an Anthropic key?

No. From milestone M3 onward they go through the Claude CLI on a subscription login, so there is no Anthropic API key; TYPESAFE_API_KEY is required from spike M0.

CommunityJev Demos & Experiments

Rpg Jev

Persistent multiplayer RPG concept where Jev makes in-world decisions, a background authoring thread builds the world, and code owns rules and state behind a WebGL terrain client.

See highlights

Open github.com

Stars: 3
Language: TypeScript
Published by: Community
Author: lmvdz
Last verified: Oct 2026

lmvdz/rpg-jevArchived

User repository on GitHub

View on GitHub

A living-world RPG whose NPCs are decided by TypeSafe's Jev judge model; code owns rules, numbers and state.

Forks: 0
Last pushed: Updated Sep 2026

Repo stats from the GitHub API, cached Oct 2026.

About this project

A persistent multiplayer RPG whose world keeps its own agenda. TypeSafe Jev makes every in-world decision, Claude authors the world on a background thread, and code owns rules, numbers and state. The main client is a browser WebGL2 renderer that draws glyphs on real 3D terrain. SPEC.md is the source of truth for the design, the stack and the milestones. Repo scaffold only. Two spikes gate everything else:

Quoted from the project's README. Read the full README.

Tagscommunity awesomejev catalog-import

Works forJev for Classification Jev for Evaluation

Used inJev for Software & DevTools

Languages: TypeScript

Highlights

Splits duties: Jev for world decisions, background author for content, code for rules.
Design document is the declared source of truth for stack and milestones.
Two gating spikes cover fiction judgment and the world-server database.
Pure simulation core starts with seeded randomness and no I/O.

Watch out

The repository is scaffold plus spikes so far; planned game packages land only when their milestone starts. Copy reviewed against the repository README on 2026-10-04, not from running it.

Questions about this entry

Short answers drawn from the linked project or page.

More Jev resources like this

tweet-911

A Chrome extension that scores X posts and replies as they enter the viewport, judging the author's handle, display name and bio alongside the post text and, for replies, the parent post.

Jev Demos & Experiments#community#awesomejev#catalog-import

Community

elliothux/tweet-911TypeScript

harnessjudge

Paste a trace of an agent step, get one of four dispositions back: ok, retry, escalate or stop. Aimed at agent builders putting a supervision step around an agent loop, with the judging powered by TypeSafe Jev and a two-command setup.