Jev Harness Lab MCP Server: Install & Setup

Install Jev Harness Lab in Claude Code

Claude Code

claude mcp add jev-harness-lab -e TYPESAFE_API_KEY=... -- uvx jev-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "jev-harness-lab": {
      "command": "uvx",
      "args": [
        "jev-mcp"
      ],
      "env": {
        "TYPESAFE_API_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Jev Harness Lab MCP server do?

Jev judgments for agents: injection scanning, shell risk gating, ranking

Is the Jev Harness Lab MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does Jev Harness Lab run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Jev Harness Lab to Claude Code?

Run: claude mcp add jev-harness-lab -e TYPESAFE_API_KEY=... -- uvx jev-mcp

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