ローカルに作ったMCP serverをcopilot agentから使ってみる

# src/app.ts
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { Tool } from "@modelcontextprotocol/sdk/types.js";

export interface DiceRoll {
  faces: number;
}

// Define the dice roll tool
const rollDiceTool: Tool = {
  name: "roll-dice",
  description: "Roll a dice with a specified number of faces.",
  inputSchema: {
    type: "object",
    properties: {
      faces: {
        type: "integer",
        minimum: 1,
        default: 6,
      },
    },
  },
  async handler({ faces }: DiceRoll) {
    const result = Math.floor(Math.random() * faces) + 1;
    return {
      content: [
        {
          type: "text",
          text: `Rolled a ${faces}-sided dice: ${result}`,
        },
      ],
    };
  },
};

// Register the tool and start the server
const server = new McpServer({
  name: "DiceRollServer",
  version: "1.0.0",
  tools: [rollDiceTool],
});

const transport = new StdioServerTransport();
await server.connect(transport);
console.log("MCP Server is running and ready to accept requests.");

{
  "inputs": [],
  "servers": {
    "mcp-server-diceroll": {
      "command": "npx",
      "args": ["-y", "mcp-server-diceroll"],
      "env": {}
    }
  }
}