jev SKILL.md skillA
jev from francoischastel/jev-code is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add francoischastel/jev-code/jev@v0.5.0Pins v0.5.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- francoischastel/jev-code
- Path
skills/jev/SKILL.md- Versions recorded
- 12
- Latest version
- v0.5.0, committed Oct 7, 2026
- First version recorded
- Sep 27, 2026
- Size
- 9,057 bytes
- Repository stars
- 51
- License
- MIT
Use Jev, TypeSafe's System One classifier, whenever a coding task needs a classifier under the hood: labelling or routing many items (issues, files, log lines, test failures, commits, messages), yes/no checks with a calibrated probability (does this diff touch auth, is this claim supported by the log, is this failure flaky), scoring on ordered levels (severity, priority, quality), or ranking candidates by relevance (which file answers this question). Prefer it over eyeballing long lists…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Jev: a classifier for coding agents
Jev is a decision model, not a text model. Give it evidence and typed questions; it returns
typed answers with calibrated probabilities in roughly 70 to 500 ms, for a fraction of a cent.
It never writes prose, so there is nothing to parse and the answer is always one of the options
you supplied. Use it for the narrow judgments inside a task while you keep control of the
workflow.
The live TypeSafe docs are the source of truth for the model, the primitives, and worked
examples: start at https://docs.typesafe.ai/llms.txt and append `.md` to any page path. This
skill gives direction; read the docs when a detail matters.
## When to reach for Jev
Reach for it when you notice yourself about to:
- Label, route, group, or triage more than a handful of items by hand.
- Write a regex or keyword heuristic to decide something semantic ("is this a flaky test?").
- Skim a long list of files, docs, or search hits to find the few that matter.
- Assert something you have not verified ("tests pass", "this is backwards compatible").
- Rate severity, priority, or quality consistently across many items.
…Read the whole file at its exact version.
How to install
mdr add francoischastel/jev-code/jev@sha256:cab3ac7dd6e99e73The line at the top of this page pins the label v0.5.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ldjqpyhh5fjc64px)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 12 versions of this file, between Sep 27, 2026 and Oct 7, 2026, more than one a day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.5.0 latest | 2026-10-07 | f499617 | 9,057 B | A | view · diff |
| v0.4.1 | 2026-10-07 | da8d682 | 9,057 B | A | view · diff |
| v0.4.1 | 2026-10-07 | 61178cb | 8,886 B | A | view · diff |
| v0.4.1 | 2026-10-03 | 2bf1fde | 8,795 B | A | view · diff |
| v0.4.0 | 2026-10-03 | 732100f | 8,795 B | A | view · diff |
| v0.4.0 | 2026-10-03 | 4379c62 | 8,734 B | A | view · diff |
| v0.3.0 | 2026-10-03 | bb91574 | 8,734 B | A | view · diff |
| v0.3.0 | 2026-09-30 | cee3202 | 8,670 B | A | view · diff |
| v0.2.1 | 2026-09-30 | e157856 | 8,670 B | A | view · diff |
| v0.2.1 | 2026-09-27 | 888df07 | 8,656 B | A | view · diff |
| v0.2.0 | 2026-09-27 | c64fc3c | 8,656 B | A | view · diff |
| v0.2.0 | 2026-09-27 | d35eb58 | 8,660 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9057 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
francoischastel/jev-code · 51 stars · license MIT · pushed 2026-10-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ldjqpyhh5fjc64px GET https://markdownregistry.com/api/v1/resolve?ref=francoischastel/jev-code/jev GET https://markdownregistry.com/api/v1/blob/cab3ac7dd6e99e73ebcb3b913dcdc81556a93eb939014a1088dd159766e2c2e5
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from francoischastel/jev-code
Every file in francoischastel/jev-code