Jev-Style — Claude Code MCP server: decisions and setup
A local MCP server for yes/no answers, choices, and ratings with probabilities. It fits agents that handle repeated decision checks.
claude mcp add --env JEV_STYLE_URL=<JEV_STYLE_URL> --transport stdio jev-style -- uvx jev-styleWhat Jev-Style 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.
What it helps with
- 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 for the agent
- Ask the MCP tool
noulwhether this support ticket should be escalated, including the probability. - Use
choiceto select the best option from this requirements list. - Run
scoreto rate the release risk across 2 to 10 levels.
How to install Jev-Style
Platform CLI
claude mcp add --env JEV_STYLE_URL=<JEV_STYLE_URL> --transport stdio jev-style -- uvx jev-styleReplace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from jev-style <command>
Platform CLI
codex mcp add jev-style --env JEV_STYLE_URL=<JEV_STYLE_URL> -- uvx jev-styleReplace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from jev-style <command>
Config file
{
"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>
Config file
{
"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>
Platform CLI
gemini mcp add -e JEV_STYLE_URL=<JEV_STYLE_URL> jev-style uvx jev-styleReplace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from jev-style <command>
Step by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about Jev-Style
How do I install Jev-Style in Claude Code?
Run claude mcp add jev-style -- uvx jev-style. This registers the server with its local runner.
What does Jev-Style do?
It gives an agent local MCP tools for yes/no questions, option selection, and ordered ratings. Results include probabilities for the available options.
Which question types does the server support?
noul handles yes/no questions, choice selects from up to 255 options, and score uses 2 to 10 rating levels.
