Automated README summary
Automatically summarized from the README on 26 Oct 2026; not a run by jevbooks. Run instructions and author-reported outcomes still need verification.
What it is
A local chess.com-style board where each side can be a Claude model, TypeSafe's Jev, or a human. It enforces full chess rules, shows a Stockfish eval bar, and grades every move.
How it uses Jev
Jev plays as a chess engine: jev.js sends a `choice` question whose options are the legal moves, each annotated with precomputed facts (captures, check, mate, piece safety, material result, threats, development, repetition, mate-in-one danger). Option order is shuffled each turn because Jev favors early options; the returned move is validated against legal moves before acceptance.
Primitives:choice
Technique worth stealing
Annotate each choice option with precomputed tactical facts and shuffle option order, since the decision model does not search ahead and favors early options.
Try it
git clone, npm install, add keys to .env, npm start; or MOCK=1 npm start for random moves.
Model judgments from README excerpts
Project signals use repository metadata, an existing summary and the first 700 README characters, not the full project. “Not found” means not detected in that material; it does not establish absence. These are the original judgments with recorded models and dates, not source audits or run results.
Models & evaluation dates
- Inclusion gate
jev-1.14.0- Project signals
jev-1.14.0- Category
jev-1.14.0- Pattern tags
jev-1.14.0
Evidence
These signals use repository metadata, an existing summary and at most 700 cleaned README characters. ≥ 0.60 means reported in that excerpt; ≤ 0.40 means not found there. The middle band is inconclusive. None is a source-code audit or a test result. The runnable-tool question excludes research experiments; the recommendation question asks for a learning shortlist, not a quality verdict.
- Jev is core to the projectnot found in the excerpt0.04
- Shows a System One patternnot found in the excerpt0.14
- Describes handling uncertaintynot found in the excerpt0.03
- Reports measured numbersFound in material0.90
- Is a runnable toolFound in material0.70
- Top-10 learning shortlist signalnot found in the excerpt0.14
- Is a replica of the modelnot found in the excerpt0.03
- Solves a common problem (0–2)score on a 0–2 scale0.01 / 2
- About JevFound in material0.98
no-judgment band (0.40–0.60)
no-judgment band (0.40–0.60)
The Jev model and date for each judgment stage are listed above. Card written by DeepSeek V4.1 Flash from the README on 26 Oct 2026.