MCP server for Jev (TypeSafe System One): the three official question types — choice, score, noul — plus batch classify. Calibrated probabilities, ~0.5s, <$0.001/call.
View on GitHub ↗MCP server for Jev, TypeSafe's System One model. It exposes the three official question types (choice, score, noul) plus compare, verify, batch classify, and a one-command installer that writes your client config for you.
Jev is a hosted decision model from TypeSafe. You send a structured question with enumerated options; it returns a typed answer with calibrated probabilities and a confidence value. It does not write prose and it does not explain itself. A single call costs roughly $0.00002 to $0.0001 and returns in about half a second, which is what makes it practical for the small, repeated judgments (triage, routing, grading, gating) that a frontier model is too slow and too expensive to run on every item.
You need a TypeSafe API key. There is no local model, no second LLM, and nothing else to install.
No uv yet? curl -LsSf https://astral.sh/uv/install.sh sh, or brew install uv, or pip install uv. A plain pip install jev-mcp-server works too; the installer subcommand is the same either way.
Manual config (clients without an installer entry)
OpenCode (opencode.json, "mcp" section): {"jev": {"type": "local", "command": ["uvx", "jev-mcp-server"], "env": {"TYPESAFEAPIKEY": "apikeyxxx"}}}
Prefer not to put the key in config at all? Skip the env block and call the setup tool once from your agent. It verifies the key live and stores it with 0600 permissions.
Tool Official type What it does Typical use ------------ choice choice Pick 1 of 2-100 options; probabilities over all options, so near-ties are visible Triage, routing, tie-breaking score score Grade on an ordered
From the project README.
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