Publish Your MCP Server

mkdir my-mcp-tool && cd my-mcp-tool
npm init -y
npm install typescript @types/node --save-dev
npx tsc --init

{
  "name": "my-mcp-tool",
  "version": "1.0.0",
  "type": "module",
  "main": "dist/index.js",
  "scripts": {
    "build": "tsc",
    "start": "node dist/index.js"
  },
  "dependencies": {
    "@modelcontextprotocol/sdk": "^1.0.0",
    "zod": "^3.22.0"
  },
  "devDependencies": {
    "@types/node": "^20.0.0",
    "typescript": "^5.3.0"
  }
}

npm install @modelcontextprotocol/sdk zod

import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import {
  CallToolRequestSchema,
  ListToolsRequestSchema,
} from "@modelcontextprotocol/sdk/types.js";

const server = new Server(
  { name: "text-analyzer", version: "1.0.0" },
  { capabilities: { tools: {} } }
);

// List available tools
server.setRequestHandler(ListToolsRequestSchema, async () => ({
  tools: [
    {
      name: "analyze_text",
      description: "Analyze text and return word count, character count, and estimated reading time.",
      inputSchema: {
        type: "object",
        properties: {
          text: {
            type: "string",
            description: "The text to analyze",
          },
        },
        required: ["text"],
      },
    },
  ],
}));

// Handle tool calls
server.setRequestHandler(CallToolRequestSchema, async (request) => {
  if (request.params.name === "analyze_text") {
    const { text } = request.params.arguments as { text: string };

    const words = text.split(/\s+/).filter(Boolean).length;
    const characters = text.length;
    const readingTimeMinutes = Math.ceil(words / 200);

    return {
      content: [
        {
          type: "text",
          text: JSON.stringify({
            words,
            characters,
            readingTimeMinutes,
          }, null, 2),
        },
      ],
    };
  }

  throw new Error(`Unknown tool: ${request.params.name}`);
});

// Start server with stdio transport
const transport = new StdioServerTransport();
await server.connect(transport);

npx @modelcontextprotocol/inspector node dist/index.js

{
  "mcpServers": {
    "text-analyzer": {
      "command": "node",
      "args": ["/absolute/path/to/dist/index.js"]
    }
  }
}

import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
import express from "express";

const app = express();
const server = new Server(
  { name: "text-analyzer", version: "1.0.0" },
  { capabilities: { tools: {} } }
);

// ... tool handlers (same as above) ...

app.get("/sse", async (req, res) => {
  const transport = new SSEServerTransport("/messages", res);
  await server.connect(transport);
});

app.post("/messages", async (req, res) => {
  // Handle incoming messages
});

app.listen(3001, () => {
  console.log("MCP server running on http://localhost:3001");
});