Jev in production › SQL and data pipelines

jev-harness (AntonioCoppe)

Vendor claims Jev cut a row-filter job from 48.9 seconds on Claude Code CLI to 1.3 seconds using this confidence-gated harness with shadow mode (author).

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1.3 secondsmeasured against a baseline, as published by the source
Use
SQL and data pipelines
Industry
Data and analytics
Form
Open-source tool
Stage
Announced
Plugs into
Claude Code CLI
Listed
2026-09-25
Found via
github
Repository
AntonioCoppe/jev-harness
Stars
15
Forks
2
Last push
2026-09-25
Language
TypeScript
License
MIT
jev-harness (AntonioCoppe) screenshot
docs/assets/marketing/proof/terminal/claude-cli.png in the AntonioCoppe/jev-harness README, MIT; shown from GitHub.

The README opens with

A small TypeScript library that turns TypeSafe Jev answers into actions you can ship.

Jev returns structured decisions (choice / score / noul) with confidence scores. This harness adds the missing pieces around that API: a policy, a confidence gate, shadow mode, reusable recipes, and an offline eval CLI.

It is not affiliated with TypeSafe. You need a TypeSafe API key to call Jev.

Calling Jev once is easy. Running it in production usually needs more:

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For the project's own README, linking back here:

Listed in Jev in production

Also used for sql and data pipelines