# Jev Review Diff

> Use when a code diff needs focused Jev checks against explicit invariants such as access control, compatibility, or error-state preservation.

- Skill: `pleo2/jev-review-diff` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds@latest add pleo2/jev-review-diff`
- Raw SKILL.md: https://api.skillmd.com/api/skills/pleo2/jev-review-diff/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT
- Author: Pleo2 (https://skillmd.com/u/pleo2)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/pleo2/jev-review-diff

---


# Semantic diff review with Jev

Experimental support for development agents. Use semantic evaluation where it adds value; use deterministic tools for mechanical checks.

## Workflow

Read the [shared protocol](references/protocol.md) for evidence preparation, API use and interpretation. The [client](scripts/ask.py) is bundled so this skill can be installed independently.

Inspect the exact diff, definitions, callers and relevant tests. Provide before/after snippets, verified locations and one explicit invariant per question. Include an insufficient-evidence option. Verify suspected findings with code inspection or a reproduction before issuing a review comment. Report the trigger, impact and location. Do not invent line numbers or label a vulnerability solely from a model score.

## Synthetic example

Run from this skill directory:

```sh
python3 scripts/ask.py examples/request.json --dry-run
python3 scripts/ask.py examples/request.json
```

The expected category is `violated`. Investigate disagreement by examining context, questions and results; do not tune the example merely to force agreement. A synthetic example is a smoke check, not an accuracy benchmark.

Inspired by the [TypeSafe use-case map](https://docs.typesafe.ai/concepts/use-case-map).