# Jev-Style

A local MCP server for yes/no answers, choices, and ratings with probabilities. It fits agents that handle repeated decision checks.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 22
- Author: lawrence3699
- License: Apache-2.0 · policy=link-only · description only; the file stays with the author
- Source: https://github.com/lawrence3699/jev-style
- Updated: 2026-10-17
- HTML: https://affpapa.org/en/nevibecode/mcp/jev-style

## What it does

Jev-Style runs small decision models on your machine and exposes four MCP tools: `noul` for yes/no questions, `choice` for selecting from options, `score` for ordered ratings, and `decide` for decisions. The model returns a probability for each option instead of a bare label.

It works with Claude Code, Codex, Cursor, and other MCP clients. Start it with `uvx jev-style`; no API key is required. Set `JEV_STYLE_URL` when connecting to a remote server. Inputs longer than 25,600 tokens are rejected with an error, so large files need to stay within that limit.

## Requirements
- Needs: Python and uv (commands run via uvx)
- Environment variables: `JEV_STYLE_URL` — keys and tokens: ask the human for the values, never commit them or put them in shared files.

## Install

### Claude Code (native platform)

**Platform CLI**
```bash
claude mcp add --env JEV_STYLE_URL=<JEV_STYLE_URL> --transport stdio jev-style -- uvx jev-style
```
Replace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from jev-style <command>

### Codex

**Platform CLI**
```bash
codex mcp add jev-style --env JEV_STYLE_URL=<JEV_STYLE_URL> -- uvx jev-style
```
Replace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from jev-style <command>

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "jev-style": {
            "command": "uvx",
            "args": [
                "jev-style"
            ],
            "env": {
                "JEV_STYLE_URL": "<JEV_STYLE_URL>"
            }
        }
    }
}
```
Replace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from jev-style <command>

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "jev-style": {
            "type": "stdio",
            "command": "uvx",
            "args": [
                "jev-style"
            ],
            "env": {
                "JEV_STYLE_URL": "<JEV_STYLE_URL>"
            }
        }
    }
}
```
Replace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from jev-style <command>

### Gemini CLI

**Platform CLI**
```bash
gemini mcp add -e JEV_STYLE_URL=<JEV_STYLE_URL> jev-style uvx jev-style
```
Replace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from jev-style <command>

## When to use it
- classify text with a yes/no result
- select one option from up to 255 choices
- rate an item across 2 to 10 levels
- check a tool call and return allow, ask, or deny
- measure accuracy on labelled data

## Example prompts
- Ask the MCP tool `noul` whether this support ticket should be escalated, including the probability.
- Use `choice` to select the best option from this requirements list.
- Run `score` to rate the release risk across 2 to 10 levels.

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