NExS Spreadsheet

What it does

NExS Spreadsheet is an MCP App extension that allows users to embed live, interactive NExS spreadsheets inside their AI chat interface. Instead of switching tabs, you simply provide a NExS URL, and the app renders the spreadsheet inline as a sandboxed iframe, keeping calculations and data interaction within the NExS platform while remaining visible in the conversation.

Key features

• Live Rendering: Mounts published NExS spreadsheets directly in the chat window.
• Full Interactivity: Supports all standard NExS spreadsheet calculations and interactions.
• Sandboxed Security: Uses a secure iframe approach to isolate the spreadsheet view from the host.
• Dual Transport: Supports both HTTP (for Claude Web) and stdio (for desktop clients).

Installation

• Claude Web: Run the server using npm run serve, create a tunnel (e.g., via Cloudflared), and add the tunnel URL as a Custom Connector in Settings → Connectors.
• Claude Desktop / VS Code: Add the following to your MCP config:

  {
    "mcpServers": {
      "nexs-spreadsheet": {
        "command": "node",
        "args": ["<path-to-repo>/dist/main.js", "--stdio"]
      }
    }
  }
  

Supported hosts

• claude
• vscode-copilot