Jev Snake — watch the AI play live

The same demo is one Jev call

1. Read the board — snake head, heading, food, body
2. List the safe, non-reverse directions this tick
3. Send it to Jev as one choice question
4. Jev returns the direction (with confidence)
5. Move one cell, then decide again next tick

one decision per tick · ~150–400ms · a fraction of a ¢ at retail rates

const res = await fetch("https://jevtypesafe.org/api/v1/decide", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    Authorization: `Bearer ${process.env.JEV_API_KEY}`, // jv_live_...
  },
  body: JSON.stringify({
    state:
      "Head (7,7) heading RIGHT. Food (7,10). Safe: up, right, down.",
    questions: {
      move: {
        type: "choice",
        instructions:
          "Best direction? Head for food, don't hit a wall or yourself.",
        criteria: {
          up: "safe but not closer",
          right: "toward the food",
          down: "safe",
        },
      },
    },
  }),
});
const { answers } = await res.json();
// answers.move.choice → "right" (with calibrated probabilities)
step(answers.move.choice);

This page's Play button hits a rate-limited demo route (POST /api/games/snake/tick). Production apps should call POST /api/v1/decide with a jv_live_ key from Account.

How this works

Nothing here is a hard-coded pathfinder. On each tick we build a short state string and a choice question whose criteria are only the currently legal turns (honest labels like “toward the food” vs “into the wall”). The hosted model returns one direction with a probability. If the free demo cap hits, sign in for monthly tokens or buy a small prepaid pack — same metering path as Tools.

This is an unofficial community playground. We are not affiliated with TypeSafe AI. Snake is a visible way to watch bounded decisions; production twins live under Tools and the hosted API guide.