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What is MCPcat?

MCPcat is an analytics platform that helps you understand how users interact with your MCP servers. With just one line of code, you can:
  • 🎬 Replay user sessions - See exactly how users interact with your tools
  • 🔍 Debug traces - Track down issues and understand LLM confusion points
  • 📊 Analyze usage patterns - Discover what features users need most

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Installation

1

Install the MCPcat Agent

Run the following command to install the open source MCPcat SDK:
npm i mcpcat
2

Track your MCP server

import * as mcpcat from "mcpcat";

/* 
Example MCP server
const mcpServer = new Server({ 
  name: "my-mcp-server", 
  version: "1.0.0" 
});
mcpServer.tool("my-tool", ...)
*/


// Call .track() AFTER tool call registering
mcpcat.track(mcpServer, "proj_YOUR_PROJECT_ID")
You can grab your project ID from MCPcat’s dashboard.

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Using Without an MCPcat Account

You can forward events directly to your observability platform: 
mcpcat.track(server, null, {
  exporters: {
    otlp: {
      type: "otlp",
      endpoint: "http://localhost:4318/v1/traces"
    }
  }
})
Learn more about integration options →