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 open lab for using Jev, TypeSafe's System One decision model, correctly next to Claude Code. It documents measured bugs, a patch, a hard fallback with alerts, and where typed decisions belong.
How it uses Jev
Jev answers a typed choice question about which model tier to use for each fresh turn, given the session state. Its probabilities feed a policy with a cache guard and confidence threshold, then the local proxy selects haiku, sonnet, or opus. A health gate asks one real decision before the session opens.
Primitives:choice
Technique worth stealing
Use Jev as a decision layer with a health gate, not a chatbot; measure in transcripts and billed dollars.
Try it
Clone repo, set JEV_API_KEY, run ./install.sh jev, then use jev command.
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 material0.83
- Shows a System One patternnot found in the excerpt0.37
- Describes handling uncertaintyunclear0.57
- Reports measured numbersnot found in the excerpt0.15
- Is a runnable toolnot found in the excerpt0.28
- Top-10 learning shortlist signalunclear0.55
- Is a replica of the modelnot found in the excerpt0.05
- Solves a common problem (0–2)score on a 0–2 scale1.09 / 2
- About JevFound in material0.99
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.