Typed judgment tools for MCP agents. TypeSafe's Jev model as verify, screen, find, classify, rerank, decide, compare, extract, review, gate, and score: the model judges, policy decides auto, review, o
An MCP server that gives your coding agent eleven judgment tools backed by TypeSafe's Jev model. The agent hands a tool some evidence and a question it can enumerate: is this claim supported, is this page safe to read, which of these files answers the question, did this patch finish the task. Jev answers with probabilities, usually in under a second. Policy turns them into one of three actions: auto (proceed), review (check it another way), or escalate (stop).
Use it for checks that have a fixed set of answers. When the step needs new text, code, or options you cannot list, the agent should write it itself.
You need Python 3.12+, uv, a POSIX system (Linux or macOS), and a TypeSafe API key from console.typesafe.ai. The package is not on PyPI yet, so you run it from a clone.
Install with the installer (recommended)
Restart your agent. The tools show up as jevverify, jevgate, and so on (mcpjev in Claude Code).
setup reads the key from TYPESAFEAPIKEY, or asks for it at a hidden prompt. It never takes the key as an argument, so the key stays out of your shell history. It makes one live call to check the key and writes nothing if TypeSafe rejects it. A good key goes to ~/.config/jev-mcp/key, readable only by you. The server uses that file whenever TYPESAFEAPIKEY is unset, so agents you start without exporting the key still work. When the variable is set, it wins.
install finds the agents on your machine, shows what it will change, and asks before writing. It supports Claude Code, Claude Desktop, Codex (CLI and the ChatGPT app), Cursor, OpenCode, Pi, omp, and Pythinker.
From the project README.
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