diff --git a/erpnext-mcp/src/index.ts b/erpnext-mcp/src/index.ts
new file mode 100644
index 0000000..26c2770
--- /dev/null
+++ b/erpnext-mcp/src/index.ts
@@ -0,0 +1,148 @@
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import express from "express";
+
+import { ERPNextClient } from "./services/erpnext-client.js";
+import { registerCoreTools } from "./tools/core.js";
+import { registerAccountingTools } from "./tools/accounting.js";
+import { registerSellingTools } from "./tools/selling.js";
+import { registerBuyingTools } from "./tools/buying.js";
+import { registerStockTools } from "./tools/stock.js";
+import {
+  registerManufacturingTools,
+  registerHRTools,
+  registerCRMTools,
+  registerProjectTools,
+  registerSupportTools,
+  registerSetupTools,
+} from "./tools/domains.js";
+import { registerFrappeTools } from "./tools/frappe.js";
+
+// ── Configuration ───────────────────────────────────────
+
+function getConfig() {
+  const baseUrl = process.env.ERPNEXT_URL || process.env.ERPNEXT_BASE_URL || "";
+  const apiKey = process.env.ERPNEXT_API_KEY || "";
+  const apiSecret = process.env.ERPNEXT_API_SECRET || "";
+
+  if (!baseUrl || !apiKey || !apiSecret) {
+    console.error(
+      "Missing required environment variables:\n" +
+        "  ERPNEXT_URL       - ERPNext instance URL (e.g. https://erp.example.com)\n" +
+        "  ERPNEXT_API_KEY   - API Key from ERPNext user settings\n" +
+        "  ERPNEXT_API_SECRET - API Secret from ERPNext user settings"
+    );
+    process.exit(1);
+  }
+
+  return { baseUrl, apiKey, apiSecret };
+}
+
+// ── Server Setup ────────────────────────────────────────
+
+function createServer(): { server: McpServer; client: ERPNextClient } {
+  const config = getConfig();
+  const client = new ERPNextClient(config);
+
+  const server = new McpServer({
+    name: "erpnext-mcp-server",
+    version: "1.0.0",
+  });
+
+  // Register all tool categories
+  registerCoreTools(server, client);         // 1-15:  Generic CRUD, search, reports, meta, bulk ops
+  registerAccountingTools(server, client);   // 16-22: GL balance, exchange rate, journal entries, payments
+  registerSellingTools(server, client);      // 23-30: Quotations, sales orders, invoices, delivery notes
+  registerBuyingTools(server, client);       // 31-36: Purchase orders, receipts, RFQ, supplier quotations
+  registerStockTools(server, client);        // 37-50: Stock balance, entries, batches, barcodes, bins
+  registerManufacturingTools(server, client);// 51-53: Work orders, BOMs
+  registerHRTools(server, client);           // 54-57: Employees, departments, org chart
+  registerCRMTools(server, client);          // 58-60: Leads, opportunities, pipeline
+  registerProjectTools(server, client);      // 61-63: Projects, tasks
+  registerSupportTools(server, client);      // 64-66: Issues, SLA
+  registerSetupTools(server, client);        // 67-70: Company, addresses, holidays, T&C
+  registerFrappeTools(server, client);       // 71-100+: Get/set value, assignments, comments, tags,
+                                              //          leaderboards, notifications, todos, activity,
+                                              //          linked docs, print formats, warehouse tree,
+                                              //          returns, material request ops, rename, etc.
+
+  console.error(
+    `ERPNext MCP Server initialized\n` +
+      `  Instance: ${config.baseUrl}\n` +
+      `  Tools registered: 100+`
+  );
+
+  return { server, client };
+}
+
+// ── Transport: stdio ────────────────────────────────────
+
+async function runStdio(): Promise<void> {
+  const { server } = createServer();
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+  console.error("ERPNext MCP Server running on stdio");
+}
+
+// ── Transport: Streamable HTTP ──────────────────────────
+
+async function runHTTP(): Promise<void> {
+  const { server } = createServer();
+  const app = express();
+  app.use(express.json());
+
+  // Health check
+  app.get("/health", (_req, res) => {
+    res.json({ status: "ok", server: "erpnext-mcp-server", version: "1.0.0" });
+  });
+
+  // MCP endpoint
+  app.post("/mcp", async (req, res) => {
+    const transport = new StreamableHTTPServerTransport({
+      sessionIdGenerator: undefined,
+      enableJsonResponse: true,
+    });
+    res.on("close", () => transport.close());
+    await server.connect(transport);
+    await transport.handleRequest(req, res, req.body);
+  });
+
+  // Handle GET and DELETE for MCP protocol compliance
+  app.get("/mcp", async (_req, res) => {
+    res.writeHead(405).end(JSON.stringify({
+      jsonrpc: "2.0",
+      error: { code: -32000, message: "Method not allowed. Use POST for MCP requests." },
+      id: null,
+    }));
+  });
+
+  app.delete("/mcp", async (_req, res) => {
+    res.writeHead(405).end(JSON.stringify({
+      jsonrpc: "2.0",
+      error: { code: -32000, message: "Method not allowed." },
+      id: null,
+    }));
+  });
+
+  const port = parseInt(process.env.PORT || "32802", 10);
+
+  app.listen(port, () => {
+    console.error(`ERPNext MCP Server running on http://0.0.0.0:${port}/mcp`);
+  });
+}
+
+// ── Entrypoint ──────────────────────────────────────────
+
+const transport = process.env.TRANSPORT || "stdio";
+if (transport === "http") {
+  runHTTP().catch((error) => {
+    console.error("Server error:", error);
+    process.exit(1);
+  });
+} else {
+  runStdio().catch((error) => {
+    console.error("Server error:", error);
+    process.exit(1);
+  });
+}