What it is
A Rust CLI and stdio MCP server that finds open-source repositories and crates from natural-language queries. Built for developers and autonomous coding agents that need verified, installable packages instead of hallucinated names.
How it uses Jev
After grounding candidates via the GitHub REST API and crates.io, jev-scout sends all candidates in one speculative fan-out call to the TypeSafe System One endpoint. Jev answers Score(fit) from 1 to 4, Noul(modern) as a calibrated maintenance probability, and Choice(best_match). Results are ranked by score times confidence and rendered as terminal cards or JSON.
Primitives:choicescorenoul
Technique worth stealing
Decouple discovery from decision: ground candidates in live registry metadata first, then let Jev score them in one fan-out call.
Try it
cargo install jev-scout, export TYPESAFE_API_KEY, then run jev-scout "fast sqlite tui in rust".
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.83
- Shows a System One patternunclear0.58
- Handles uncertaintyno0.08
- Measuredno0.12
- Runnableyes0.88
- Worth recommendingno0.28
- Model replicano0.16
- Problem scopescore on a 0–2 scale1.79
- About Jevyes0.97
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.