jev-slalom

# Jev Slalom course design Jev Slalom runs a live course: a line of gates sweeps down a valley and Jev (TypeSafe's System One model) reads its position and the next gate each tick and steers left/right to thread each gap. The agent shapes `slalom.json`: the descent speed, the valley width, and how many gates. ## The loop 1. Update `slalom.json` (title, speed, gates, valleyWidth, optional gateGap, a `style` line that tells Jev a line strategy). The viewer watches it and Jev adapts live — no restart, no second server. 2. `node "$JEV_DSH/toolchain/check.mjs"` verifies the workspace's `slalom.json` is valid. Run it before you call a run done. 3. Watch the descent. Does Jev line up on the next gate, commit as it arrives, and thread a clean run — or never fall (dull) or fall even at calm speed (bad)? That observation is the finding. ## Reading the run The viewer shows a top-down course: the skier descends with a snow trail, gates sweep toward it and light up green as they're threaded, a dashed line marks the target gate, and a finished run shows a CLEAN RUN or FELL banner plus a run log. Good courses produce a readable loop: Jev carves across the valley to the next gate, threads it, and builds a rhythm; `speed` is the difficulty dial — crank it up and Jev's aim wobbles and it clips a gate and falls. ## Verifying a course `node "$JEV_DSH/toolchain/check.mjs"` returns non-zero when `slalom.json` is invalid (no title, a non-positive speed, out-of-range gates/valleyWidth/gateGap/tickMs). It doesn't replace watching the run: confirm Jev threads the gates at the speed you set, and that cranking `speed` up makes it visibly fall. ## Driving Jev yourself `toolchain/jev.mjs` exports a small client. Example (from the workspace) — ask Jev's read on a gate before you commit to it: ```bash node --input-type=module -e ' import { evaluate, jev } from "$JEV_DSH/toolchain/jev.mjs"; const res = await evaluate({ state: "You are skiing the slalom. The skier descends at 3.0 rows/tick. Next gate: x 14.5, gap 6.0. skier x 9.0 gate x 14.5 gate in 1.2. Which way do you steer? LEFT_FAST / LEFT / HOLD / RIGHT / RIGHT_FAST", questions: { steer: jev.choice(["LEFT_FAST", "LEFT", "HOLD", "RIGHT", "RIGHT_FAST"], "Which way do you steer this tick?"), }, }); console.log(JSON.stringify(res.answers, null, 2)); ' ``` Without `TYPESAFE_API_KEY` this uses the deterministic mock; set the key to hit live Jev.