OpenJEV runs on your own machine — the client starts it, so there is no endpoint to ping. 394 installs a week from npm. Last commit 10 Oct 2026.
Typed AI judgments for agents: choice, score, and yes/no probabilities instead of prose.
Today is the operative word: we check OpenJEV every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add openjev-mcp -- npx -y openjev-mcp
{
"mcpServers": {
"openjev-mcp": {
"args": [
"-y",
"openjev-mcp"
],
"command": "npx"
}
}
}
[mcp_servers.openjev-mcp]
command = "npx"
args = ["-y", "openjev-mcp"]
{
"mcpServers": {
"openjev-mcp": {
"args": [
"-y",
"openjev-mcp"
],
"command": "npx"
}
}
}
{
"mcpServers": {
"openjev-mcp": {
"args": [
"-y",
"openjev-mcp"
],
"command": "npx"
}
}
}
This one needs environment variables set before it will start:
OPENJEV_API_KEY (OpenJEV API key from https://openjev.sh/dashboard), OPENJEV_MODEL (Model alias used when a call does not name one (default: openjev)), OPENJEV_TIMEOUT_MS (Per-attempt timeout in milliseconds, 1000-600000 (default: 30000)), OPENJEV_MAX_RETRIES (Retries after the first attempt, 0-10 (default: 2)).
The author declared them in the registry entry; get the values from the project itself.
Typed Jev decisions in one batched tool: choice, score, and yes/no probabilities.
Calibrated decisions for agents: choice, yes/no and score questions answered with probabilities.
Calibrated judgments for text: yes/no probabilities, picks from your options, or scores.
Typed yes/no, pick-one and score judgments from Jev in one batched call; typed escalation back.
Ask TypeSafe Jev yes/no, choice and score questions and receive structured model judgments.
MCP server over TypeSafe Jev: typed ask, rank and check judgments return calibrated probabilities.
Evaluate state with typed choice, score, and probability questions.
Calibrated advice for coding agents: typed questions in, probabilities out. Apple Silicon.
Answers built from our own checks of this server.