Jev Decision MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 68 installs a week from npm. Last commit 31 Oct 2026.
Typed Jev decisions in one tool: choice, score, yes/no probabilities via any compatible endpoint.
Today is the operative word: we check Jev Decision MCP 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 jev-decision-mcp -e 'BASE_URL=<BASE_URL>' -e 'MODEL=<MODEL>' -- npx -y jev-decision-mcp
{
"mcpServers": {
"jev-decision-mcp": {
"command": "npx",
"args": [
"-y",
"jev-decision-mcp"
],
"env": {
"BASE_URL": "<BASE_URL>",
"MODEL": "<MODEL>"
}
}
}
}
[mcp_servers.jev-decision-mcp]
command = "npx"
args = ["-y", "jev-decision-mcp"]
env = { BASE_URL = "<BASE_URL>", MODEL = "<MODEL>" }
{
"mcpServers": {
"jev-decision-mcp": {
"command": "npx",
"args": [
"-y",
"jev-decision-mcp"
],
"env": {
"BASE_URL": "<BASE_URL>",
"MODEL": "<MODEL>"
}
}
}
}
{
"servers": {
"jev-decision-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"jev-decision-mcp"
],
"env": {
"BASE_URL": "<BASE_URL>",
"MODEL": "<MODEL>"
}
}
}
}
Put your own values in place of
<BASE_URL> (Absolute http(s) API root prefix; the SDK appends /v1/systemone. Required at startup with no provider default or host allowlist; custom path prefixes are supported. Must not include credentials, a query or a fragment), <MODEL> (Default model name sent to the configured endpoint. Required at startup with no default or model allowlist; a per-call model argument overrides it and a blank per-call override is rejected).
The author’s registry entry marks them as required.
Optional settings from the registry entry, left out of the block above:
API_KEY (API credential for the configured endpoint, sent as a Bearer token. Optional at startup (tool discovery works without it); decision calls require it and return MISSING_API_KEY until it is set), JEV_TIMEOUT_MS (Total request deadline in milliseconds, including automatic SDK retries (1–120000)).
Typed AI judgments for agents: choice, score, and yes/no probabilities instead of prose.
Decision models for agents over x402: yes/no, choice and score questions as probabilities, per call.
Calibrated decisions for agents: choice, yes/no and score questions answered with probabilities.
Typed decisions (choice, score, yes/no) from Laya, Julia-1 and clef-flash on your own GPU
Evaluate state with typed choice, score, and probability questions.
MCP server for Jev (TypeSafe System One): typed decisions with calibrated probabilities.
Typed yes/no, pick-one and score judgments from Jev in one batched call; typed escalation back.
Local 2B and 0.8B decision models: calibrated yes/no, choice and score answers for your agent.
Answers built from our own checks of this server.