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Jev-powered Minecraft bot
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- Last pushed
- Updated Oct 2026
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Jev directory
CommunityJev Demos & Experiments
Jevcraft
A mineflayer-based Minecraft bot whose decisions are made entirely by TypeSafe's Jev System One model: code lists the legal actions and Jev picks one in about 0.2 seconds for roughly 1.7 cents per bot-hour. Fifteen of 40 fresh worlds reached the Nether; none has beaten the game.
- Stars
- 5
- Language
- JavaScript
- License
- MIT
- Reading time
- 3 min
- Published by
- Community
- Author
- mrubens
- Last verified
- Oct 2026
Used inJev for Gaming
- Languages
- JavaScript
- Capabilities
- Open sourceRequires API key
Highlights
- Code decides what is possible, Jev decides what to do; every play question also offers a none_good option that logs missing moves.
- Measured 2026-09-28: about 130 decisions per bot-hour, median answer 186 ms, roughly 3,100 input tokens per decision.
- 15 of 40 worlds reached the Nether (fastest 7 minutes, median 28); getting six blaze rods is the current wall.
- A shared ledger rests options that failed twice, and a replay suite re-asks recorded questions live five times before merges.
- Fixes come from Claude subagents triaging death timelines; Jev itself is never retrained.
Watch out
README reviewed 2026-10-17; the numbers come from the author's own trial logs around 2026-09-28, the bot has not beaten the game, and there are no fallbacks when the Jev service is down: the bot holds and waits rather than deciding anything in code.
Questions about this entry
Short answers drawn from the linked project or page.
It is a Minecraft bot built on mineflayer whose every action is chosen by TypeSafe's Jev System One model. The code lists what the bot can really do and Jev picks one in about 0.2 seconds, so no text or code is generated for decisions.
The README's 2026-09-28 measurement puts it at about 1.7 cents per bot-hour: 22,800 decisions over about 178 bot-hours, a median 186 ms answer, roughly 3,100 input tokens per decision at TypeSafe's published $0.042 per million input tokens, with output free.
Code builds options from the game state with prices in damage and seconds, Jev returns a probability for every option, the pick is held until a fact it was chosen on changes, and outcomes feed a shared ledger that rests options which twice came to nothing.
Fifteen of 40 fresh worlds started on 2026-09-28 reached the Nether, the fastest in 7 minutes and the median 28, but none has beaten the game; six blaze rods are the current wall, and most trials that took rods died in the Nether soon after.
Nothing is decided by code: the bot holds where it is, says once in chat that it is waiting for Jev, and asks again with a backoff, while the body's reflexes for lava, fire, air and incoming shots still run, per the README.
Run 7 to 20 trials in parallel, one server each; a watcher reports deaths and loops; a Claude subagent triages each failure in its own git worktree; fixes need npm test, a shadow arbiter check and a replay suite of recorded questions before merging.
The GitHub user mrubens publishes it under the MIT license; the repository was created 2026-09-18 and pushed 2026-10-17. The README documents the process with trial notes cited as note numbers and clips of wins and losses.
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