chore: import upstream snapshot with attribution

03-GettingStarted/samples/javascript/index.js

@@ -0,0 +1,69 @@
+// mcp_calculator_server.js - Sample MCP Calculator Server implementation in JavaScript
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { z } from "zod"; 
+
+// Create an MCP server
+const server = new McpServer({
+  name: "Calculator MCP Server",
+  version: "1.0.0"
+});
+
+// Define calculator tools for each operation
+server.tool(
+  "add",
+  {
+    a: z.number(),
+    b: z.number()
+  },
+  async ({ a, b }) => ({
+    content: [{ type: "text", text: String(a + b) }]
+  })
+);
+
+server.tool(
+  "subtract",
+  {
+    a: z.number(),
+    b: z.number()
+  },
+  async ({ a, b }) => ({
+    content: [{ type: "text", text: String(a - b) }]
+  })
+);
+
+server.tool(
+  "multiply",
+  {
+    a: z.number(),
+    b: z.number()
+  },
+  async ({ a, b }) => ({
+    content: [{ type: "text", text: String(a * b) }]
+  })
+);
+
+server.tool(
+  "divide",
+  {
+    a: z.number(),
+    b: z.number()
+  },
+  async ({ a, b }) => {
+    if (b === 0) {
+      return {
+        content: [{ type: "text", text: "Error: Cannot divide by zero" }],
+        isError: true
+      };
+    }
+    return {
+      content: [{ type: "text", text: String(a / b) }]
+    };
+  }
+);
+
+// Connect the server using stdio transport
+const transport = new StdioServerTransport();
+server.connect(transport).catch(console.error);
+
+console.log("Calculator MCP Server started");