Is a probabilistic grep just grep with extra steps and a bigger bill?

Similar shape, different failure mode. There is no regex to write and none of a bad pattern's false positives; each line becomes one yes/no question and matches at probability -p or above, default 0.5. On 994 Hacker News titles one description took 4.6 seconds and $0.012, and three descriptions at once took the same time.

What happens if a local model is wrong on half the matches?

You still pay per line, and the probability comes back with every match so you can set a threshold. --api diffusiongemma, laya and gliner target a System One server you run yourself, are never chosen automatically, need no key, and count as $0 in --stats unless JEV_PRICE_PER_MTOK is set. Their comparison with Jev lives in a separate benchmark doc, not the main table.

Will a diff review judge hunks out of context?

Only as far as you let it. One decision covers a complete hunk: removed lines, added lines, and the context the patch itself supplies. Unless you pass -W it does not read the working tree or retrieve omitted context, so use git diff -U10 when you need more surroundings. Binary and malformed hunks error rather than silently reporting no match.

Will a search across my whole repository run up a real bill?

There is a spend ceiling and a preview. --budget defaults to $1.00, or $JEV_BUDGET, and no request is sent that would push spending past it; 0 answers only from cache. --estimate reads to EOF and previews calls and approximate cost with no authentication and no API calls, which is the safe way to try a pattern on a big tree.

How do I install jgrep and what key does it need?

Run uv tool install jev-grep. It needs a key for TypeSafe or OpenRouter, a gateway of your own, or a local System One server that needs none.

What does a real jgrep search actually cost?

Measured on 994 Hacker News titles, one description took 4.6 seconds and $0.012, and three descriptions at once took the same time.

How do I stop a jgrep search from running up a bill?

Pass --budget DOLLARS, default 1.00, which sends no request that would take spending past the limit. Use --estimate to preview calls and approximate cost without authenticating.

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Jgrep — keltokhy

A grep-style CLI where the pattern is a plain-English description: each line becomes one Jev Noul question, judged concurrently with matches printed in input order, working on tail -f as well as files.

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Stars: 138
Language: Python
License: MIT
Reading time: 3 min
Published by: Community
Author: keltokhy
Last verified: Sep 2026

keltokhy/jgrep

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grep, but the pattern is a description. Filters lines by meaning with TypeSafe's Jev decision model: ~200 ms and a thousandth of a cent per line.

Forks: 5
Last pushed: Updated Oct 2026

Repo stats from the GitHub API, cached Oct 2026.

About this project

grep, but the pattern is a description. Each line becomes one yes/no question to Jev, TypeSafe's decision model. Jev does not generate text. It returns a probability in about 200 ms for about a thousandth of a cent, which is fast and cheap enough to sit in a pipe. jgrep reads lines as they arrive, judges them concurrently and prints matches in input order, so it works on tail -f as well as on files.

Quoted from the project's README. Read the full README.

Tagscommunity python cli search classification

Works forJev for Code Jev for Decision gating

Used inJev for Software & DevTools

Highlights

Reads lines as they arrive, judges them concurrently, and prints matches in input order, so tail -f works like a file.
On 994 Hacker News titles one description took 4.6 seconds and $0.012, and three descriptions at once took the same time.
Modes judge paragraphs, whole files, JSONL and CSV fields, diff hunks, and Go, C, or Python functions, with -C to include neighbours.
Keys come from TYPESAFE_API_KEY or OPENROUTER_API_KEY, from ~/.config/jev/*.key, or from a gateway or local server selected with --api.
A budget defaults to $1.00 or JGREP_BUDGET, -p sets the match threshold, and --stats prints what the run cost.

Quickstart

bash

uv tool install jev-grep
export TYPESAFE_API_KEY=YOUR_API_KEY
jgrep "a user is getting frustrated" app.log
jgrep -o "announces or releases a new AI model" titles.txt | sort -rn | head -3

Watch out

MIT-licensed. Needs Python with uv and a TypeSafe, OpenRouter, or gateway key; records are limited to --max-chars unless --chunks is used, and Go or C parsing needs the code extra.

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Forks and copies of this project in the directory. This entry is the canonical one.

jgrep

A semantic grep CLI that chunks files or staged diffs into 5-60 line pieces, packs 16 chunks and 16 Jev Noul questions into one request, and prints file:line hits above a probability threshold with grep-style exit codes.

Jev Tools & CLIs#community#typescript#cli

Community

kyu1204/jgrepTypeScript

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Jgrep — keltokhy

About this project

Highlights

Quickstart

Questions about this entry

Is a probabilistic grep just grep with extra steps and a bigger bill?

What happens if a local model is wrong on half the matches?

Will a diff review judge hunks out of context?

Will a search across my whole repository run up a real bill?

How do I install jgrep and what key does it need?

What does a real jgrep search actually cost?

How do I stop a jgrep search from running up a bill?

Reactions & coverage

Related terms

Other listings of this project

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