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Snake autoplay powered by TypeSafe Jev (System One)
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Jev Snake — lalitsonawane
A Next.js Snake game where every move is a live System One Choice call: run it on Jev, on the wire-compatible Drex, or send the same state to both in parallel and watch the probabilities side by side.
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- TypeScript
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- lalitsonawane
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- Oct 2026
About this project
Snake autoplay where every move decision is a live System One Choice via POST /v1/systemone. Pick Jev (TypeSafe), Drex, or Compare both side by side. Safe straight-line holds may reuse the last legal direction without a new API call. Drex is wire-compatible with TypeSafe Jev (noul / choice / score). The TypeSafe SDK can talk to Drex by swapping three settings: API key, base URL, and default model (drex-latest). Some TypeSafe-shaped requests may return 422 from Drex on purpose (stricter validation).
Quoted from the project's README. Read the full README.
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Used inJev for Software & DevTools
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- TypeScript
Highlights
- Compare mode sends identical state and questions to Jev and Drex in parallel and lets you decide which model's choice actually moves the snake.
- Safe straight-line holds reuse the last legal direction with no API call, so the tick loop is not one inference request per frame.
- API keys are read only in the server Route Handler; the browser calls a same-origin route and never sees a key.
- The classic rules are spelled out, including that a self-crash must not count the tail cell the snake is vacating.
Watch out
Drex has no public base URL: api.drex.ai does not resolve, so you must set DREX_BASE_URL to your own tenant's System One root, https only and without the /v1/systemone path because the app appends it, plus DREX_API_KEY. Some TypeSafe-shaped requests return 422 from Drex deliberately because its validation is stricter. Every real move costs an inference call, so the loop waits about 90 ms between ticks and pauses after a minute idle or a hidden tab, and upstream DNS or connect failures come back as a JSON 502 rather than an HTML 500. 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.
You need your own. There is no public default and api.drex.ai does not resolve, giving a DNS ENOTFOUND. Set DREX_BASE_URL to your tenant's System One root, https only, and leave off the /v1/systemone suffix because the app appends it, along with DREX_API_KEY. If the host is unreachable you get a JSON 502 with a clear message instead of an opaque HTML 500, and some TypeSafe-shaped requests come back as a deliberate 422 from Drex's stricter validation.
Not as a measurement, no. Compare mode sends the same state and the same questions to both in parallel and shows the probabilities side by side, but one model's choice drives the snake, Jev by default, so the outcome reflects that choice rather than a controlled trial. What it gives you is a way to watch two System One implementations answer the same board state and see how far apart the distributions are.
The browser fetch to the move route is aborted, and the route forwards the request signal upstream, so the in-flight call to the provider is cancelled too rather than left running. That is the same path the pause banner and the one-minute idle or hidden-tab pause use. Secrets stay server-side throughout: keys are read only in the Route Handler and never returned to the browser.
Export TYPESAFE_API_KEY for Jev, and DREX_API_KEY plus DREX_BASE_URL if you want Drex or Compare, then npm install and npm run dev. Tests are vitest and there is a build script. On Vercel the project expects all three variables on Production and Preview, plus Development if you pull the environment. A Jev-only alias route also still exists at /api/jev-move if you have something wired to it.
The snake wins when its length fills the board; it loses by moving onto its own body, leaving the board, or being trapped with no legal moves left.
It sends the same state and questions to Jev and Drex in parallel and shows the probabilities side by side, and you pick which model's choice drives the snake, defaulting to Jev.
Safe straight-line holds reuse the last legal direction without a new API call; any other move decision is a live System One Choice via POST /v1/systemone.
Other listings of this project
Forks and copies of this project in the directory. This entry is the canonical one.
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