Upsilon — AI Operator Measurement Engine

Overview

Upsilon is an AI Operator Measurement Engine that runs as a Model Context Protocol server, providing 25 local tools and SigRank proof access through the sigrank package. It integrates directly with AI assistants to expose measurement and analysis capabilities as tools your model can invoke.

The server runs locally on your machine via the npx -y sigrank command, requiring no authentication to get started. Built on the sigrank npm package and released as v1.0.8 under the MIT license, the source code is available at SunrisesIllNeverSee/sigrank-mcp on GitHub.

Upsilon appears in the AI & Agents category on mcp.site and works with MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed, and others. If you maintain this server, claim this listing to verify ownership and keep information current.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "upsilon_ai_operator_measurement_engine": {
      "command": "npx",
      "args": [
        "-y",
        "sigrank"
      ]
    }
  }
}