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Open MCP server to run TypeSafe Jev (System One) packs locally — Choice / Noul / Score for Cursor & agents
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- Updated Sep 2026
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Jev directory
CommunityJev Agents & MCP
MCP Jev
A local MCP server that runs ready-made Jev question packs for Cursor and other agents: typed Choice, Noul and Score judgments over closed state, with run_questions as the custom path when no pack fits.
- Stars
- 0
- Language
- TypeScript
- License
- MIT
- Reading time
- 2 min
- Published by
- Community
- Author
- pedroknigge
- Last verified
- Oct 2026
Used inJev for Software & DevTools
- Languages
- TypeScript
- Platforms
- MCP
- Capabilities
- Open sourceRuns locallyRequires API key
Highlights
- Closed tool catalog: list_packs, describe_pack, run_pack, run_questions and ping — no free-form ask_jev tool.
- Runs on your own PC with your own key, stored once in ~/.mcp_jev/.env; the repo does not host Jev or proxy your key.
- Install clones to ~/mcp_jev then scripts/install.sh on macOS/Linux or scripts/install.ps1 on Windows; Node 20+.
- Packs call the @typesafe-ai/sdk systemOne endpoint with choice(), noul() and score() questions such as intent, jailbreak and urgency.
- A skill ships at skills/mcp_jev/SKILL.md; the key stays out of the host mcp.json or TOML config.
Quickstart
bash
git clone https://github.com/pedroknigge/mcp_jev.git ~/mcp_jev
~/mcp_jev/scripts/install.shWatch out
Copy reviewed against the truncated repo README on 2026-10-15; the excerpt stops inside the install section, so the first-run and update flows were not reviewed. The pack catalogue itself was not inspected for this entry; the README describes packs as shortcuts and run_questions as the typed custom path.
Questions about this entry
Short answers drawn from the linked project or page.
A local MCP server that runs TypeSafe Jev packs — typed Choice, Noul and Score judgments, not chat. It is the judgment layer for agents: the host keeps observation, tools and stop rules, while mcp_jev turns closed state into typed questions and answers.
Prerequisites are Node.js 20+, git and a TypeSafe key from console.typesafe.ai. On macOS/Linux: git clone https://github.com/pedroknigge/mcp_jev.git ~/mcp_jev then ~/mcp_jev/scripts/install.sh; Windows uses scripts/install.ps1 instead.
Configure it once during MCP install into ~/.mcp_jev/.env (override the home with MCP_JEV_HOME). Any agent that attaches this MCP reuses it, and the README says never to paste the key into the host mcp.json or TOML.
A closed catalog: list_packs, describe_pack, run_pack, run_questions and ping. There is no free-form ask_jev; when no pack fits, run_questions is the typed custom path, still System One.
A versioned set of typed questions — for example a Choice for intent, a Noul for jailbreak and a Score for urgency. If a pack fits, call run_pack; otherwise compose your own closed state and typed questions and call run_questions.
No. The README states anyone runs it on their own PC with their own key; the repo does not host Jev, proxy your key, or invent a free-form ask_jev tool. The JavaScript SDK it calls is @typesafe-ai/sdk, with a Python SDK for app code.
Cursor and other agents and IDEs that speak MCP; the README ships docs/INSTALL_AGENTS.md for host specifics and skills/mcp_jev/SKILL.md for a matching skill. It is TypeScript on Node 20+.
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