Automated README summary
Automatically summarized from the README on 20 Sept 2026; not a run by jevbooks. Run instructions and author-reported outcomes still need verification.
What it is
An MCP server for TypeSafe's Jev, a System One model that returns typed judgments (noul, choice, score) with probabilities instead of generated text. It helps developers prototype, evaluate, and apply questions to many items.
How it uses Jev
Jev answers typed questions against a state. jev_ask prototypes a question on one state; jev_map runs a question set over many items, returning compact rows; jev_eval measures variants against labeled examples, providing accuracy, calibration, threshold sweep, and worst misses.
Primitives:noulchoicescore
Technique worth stealing
Use jev_eval to pick thresholds from a table, not intuition, and jev_map to keep bulk out of context.
Try it
claude mcp add jev -e TYPESAFE_API_KEY=sk-... -- npx -y jev-eval-mcp
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-1.13.0- Project signals
jev-1.13.0- Category
jev-1.13.0- Pattern tags
jev-1.13.0
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 projectFound in material0.94
- Shows a System One patternunclear0.60
- Describes handling uncertaintynot found in the excerpt0.09
- Reports measured numbersnot found in the excerpt0.05
- Is a runnable toolFound in material0.91
- Top-10 learning shortlist signalFound in material0.65
- Is a replica of the modelnot found in the excerpt0.04
- Solves a common problem (0–2)score on a 0–2 scale1.02 / 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 20 Sept 2026.