Engine MCP Server

What the code does

We read the source, 20 h ago · rules 3dff92dd89df

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

    const child = spawn(cmd, args, {

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

Connect this server

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 engine -- npx -y zpl-engine-mcp

{
  "mcpServers": {
    "engine": {
      "args": [
        "-y",
        "zpl-engine-mcp"
      ],
      "command": "npx"
    }
  }
}

[mcp_servers.engine]
command = "npx"
args = ["-y", "zpl-engine-mcp"]

{
  "mcpServers": {
    "engine": {
      "args": [
        "-y",
        "zpl-engine-mcp"
      ],
      "command": "npx"
    }
  }
}

{
  "mcpServers": {
    "engine": {
      "args": [
        "-y",
        "zpl-engine-mcp"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: ZPL_API_KEY (User API key from zeropointlogic.io/dashboard/api-keys. Format: zpl_u_ + 48 hex chars. Service keys (zpl_s_) are rejected since v3.5.0.), ZPL_MODE (pure (default) hides AIN score from the AI on text-evaluation tools to prevent observer effect. coach exposes the score.), ZPL_ENGINE_URL (Engine base URL. Defaults to https://engine.zeropointlogic.io.), ANTHROPIC_API_KEY (Only required for the 8 AI-eval tools (zpl_consistency_test, zpl_sycophancy_score, etc). Session capped at 100 Claude calls per process.). The author declared them in the registry entry; get the values from the project itself.