feat: publish example servers to npm (#184)

* feat: publish example servers to npm

Make example MCP App servers publishable to npm under the
@modelcontextprotocol scope:

- server-basic-react
- server-basic-vanillajs
- server-budget-allocator
- server-cohort-heatmap
- server-customer-segmentation
- server-scenario-modeler
- server-system-monitor
- server-threejs
- server-wiki-explorer

Changes:
- Remove `private: true` from example package.json files
- Add proper npm metadata (description, repository, license, files)
- Update ext-apps dependency from relative to ^0.2.2
- Copy server-utils.ts into each package for standalone use
- Add publish-examples job to npm-publish.yml workflow

The examples will be published automatically when a GitHub release
is created, after the main SDK package is published.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* feat: publish examples with pkg-pr-new for PR testing

* feat: export createServer from example servers

* style: format integration-server/server.ts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: update e2e snapshots for basic-server examples

Update golden screenshots for basic-react and basic-vanillajs after
the tool output was simplified from JSON to plain text in #182.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* merge

* refactor: update sheet-music-server and video-resource-server to new publishing pattern

- Move server-utils.ts from src/ to root level
- Add npm publishing metadata (scoped name, repository, license, files)
- Change ext-apps dependency from local to versioned ^0.2.2
- Update server.ts to handle stdio mode inline

* update package-lock

* fix: update package-lock.json for renamed server packages

* feat: add NASA public domain video to video-resource-server

Added 'nasa-earth' option - NASA ISS Earth observations (6.4MB).
Source: archive.org/details/NASA-Ultra-High-Definition (public domain)

* fix: add default videoId for video-resource-server

* fix: use existing bunny-1mb as default video, remove nasa-earth

* refactor: update new framework examples to publishing pattern

Add publishing metadata for:
- @modelcontextprotocol/server-basic-preact
- @modelcontextprotocol/server-basic-solid
- @modelcontextprotocol/server-basic-svelte
- @modelcontextprotocol/server-basic-vue

Changes:
- Move server-utils.ts from src/ to root
- Add npm publishing metadata
- Update ext-apps dep to versioned ^0.2.2
- Add stdio mode support in main()

* fix: add missing @rollup/rollup-win32-arm64-msvc to optionalDependencies

This fixes the Windows ARM64 CI build failure caused by npm's optional
dependency bug. The package.json was missing this platform-specific
rollup binding.

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Olivier Chafik <ochafik@anthropic.com>

Author: 3 people

.github/workflows/npm-publish.yml

@@ -83,3 +83,47 @@ jobs:
       - run: npm publish --provenance --access public ${{ steps.npm-tag.outputs.tag }}
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_SECRET }}
+
+  publish-examples:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'release'
+    environment: Release
+    needs: [publish]
+
+    permissions:
+      contents: read
+      id-token: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        example:
+          - basic-server-react
+          - basic-server-vanillajs
+          - budget-allocator-server
+          - cohort-heatmap-server
+          - customer-segmentation-server
+          - scenario-modeler-server
+          - system-monitor-server
+          - threejs-server
+          - wiki-explorer-server
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+          registry-url: "https://registry.npmjs.org"
+      - run: npm ci
+
+      - name: Build example
+        run: npm run build --workspace examples/${{ matrix.example }}
+
+      - name: Publish example
+        run: npm publish --workspace examples/${{ matrix.example }} --provenance --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_SECRET }}

.github/workflows/publish.yml

@@ -20,4 +20,16 @@ jobs:
           cache: npm
       - run: npm ci
       - run: npm run build
-      - run: npx pkg-pr-new publish
+      - run: npm run examples:build
+      - run: |
+          npx pkg-pr-new publish \
+            . \
+            ./examples/basic-server-react \
+            ./examples/basic-server-vanillajs \
+            ./examples/budget-allocator-server \
+            ./examples/cohort-heatmap-server \
+            ./examples/customer-segmentation-server \
+            ./examples/scenario-modeler-server \
+            ./examples/system-monitor-server \
+            ./examples/threejs-server \
+            ./examples/wiki-explorer-server

examples/basic-server-preact/package.json

@@ -1,17 +1,30 @@
 {
-  "name": "basic-server-preact",
-  "version": "1.0.0",
-  "private": true,
+  "name": "@modelcontextprotocol/server-basic-preact",
+  "version": "0.1.0",
   "type": "module",
+  "description": "Basic MCP App Server example using Preact",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/modelcontextprotocol/ext-apps",
+    "directory": "examples/basic-server-preact"
+  },
+  "license": "MIT",
+  "main": "server.ts",
+  "files": [
+    "server.ts",
+    "server-utils.ts",
+    "dist"
+  ],
   "scripts": {
     "build": "tsc --noEmit && cross-env INPUT=mcp-app.html vite build",
     "watch": "cross-env INPUT=mcp-app.html vite build --watch",
     "serve": "bun server.ts",
     "start": "cross-env NODE_ENV=development npm run build && npm run serve",
-    "dev": "cross-env NODE_ENV=development concurrently 'npm run watch' 'npm run serve'"
+    "dev": "cross-env NODE_ENV=development concurrently 'npm run watch' 'npm run serve'",
+    "prepublishOnly": "npm run build"
   },
   "dependencies": {
-    "@modelcontextprotocol/ext-apps": "../..",
+    "@modelcontextprotocol/ext-apps": "^0.2.2",
     "@modelcontextprotocol/sdk": "^1.24.0",
     "preact": "^10.0.0",
     "zod": "^4.1.13"
@@ -23,7 +36,7 @@
     "@types/node": "^22.0.0",
     "concurrently": "^9.2.1",
     "cors": "^2.8.5",
-    "cross-env": "^7.0.3",
+    "cross-env": "^10.1.0",
     "express": "^5.1.0",
     "typescript": "^5.9.3",
     "vite": "^6.0.0",

examples/basic-server-preact/server-utils.ts

@@ -0,0 +1,68 @@
+/**
+ * Shared utilities for running MCP servers with Streamable HTTP transport.
+ */
+
+import { createMcpExpressApp } from "@modelcontextprotocol/sdk/server/express.js";
+import type { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
+import cors from "cors";
+import type { Request, Response } from "express";
+
+export interface ServerOptions {
+  port: number;
+  name?: string;
+}
+
+/**
+ * Starts an MCP server with Streamable HTTP transport in stateless mode.
+ *
+ * @param createServer - Factory function that creates a new McpServer instance per request.
+ * @param options - Server configuration options.
+ */
+export async function startServer(
+  createServer: () => McpServer,
+  options: ServerOptions,
+): Promise<void> {
+  const { port, name = "MCP Server" } = options;
+
+  const app = createMcpExpressApp({ host: "0.0.0.0" });
+  app.use(cors());
+
+  app.all("/mcp", async (req: Request, res: Response) => {
+    const server = createServer();
+    const transport = new StreamableHTTPServerTransport({
+      sessionIdGenerator: undefined,
+    });
+
+    res.on("close", () => {
+      transport.close().catch(() => {});
+      server.close().catch(() => {});
+    });
+
+    try {
+      await server.connect(transport);
+      await transport.handleRequest(req, res, req.body);
+    } catch (error) {
+      console.error("MCP error:", error);
+      if (!res.headersSent) {
+        res.status(500).json({
+          jsonrpc: "2.0",
+          error: { code: -32603, message: "Internal server error" },
+          id: null,
+        });
+      }
+    }
+  });
+
+  const httpServer = app.listen(port, () => {
+    console.log(`${name} listening on http://localhost:${port}/mcp`);
+  });
+
+  const shutdown = () => {
+    console.log("\nShutting down...");
+    httpServer.close(() => process.exit(0));
+  };
+
+  process.on("SIGINT", shutdown);
+  process.on("SIGTERM", shutdown);
+}

examples/basic-server-preact/server.ts

@@ -1,9 +1,10 @@
-import { registerAppResource, registerAppTool, RESOURCE_MIME_TYPE } from "@modelcontextprotocol/ext-apps/server";
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import type { CallToolResult, ReadResourceResult } from "@modelcontextprotocol/sdk/types.js";
 import fs from "node:fs/promises";
 import path from "node:path";
-import { startServer } from "./src/server-utils.js";
+import { registerAppTool, registerAppResource, RESOURCE_MIME_TYPE } from "@modelcontextprotocol/ext-apps/server";
+import { startServer } from "./server-utils.js";
 
 const DIST_DIR = path.join(import.meta.dirname, "dist");
 
@@ -55,4 +56,16 @@ function createServer(): McpServer {
   return server;
 }
 
-startServer(createServer);
+async function main() {
+  if (process.argv.includes("--stdio")) {
+    await createServer().connect(new StdioServerTransport());
+  } else {
+    const port = parseInt(process.env.PORT ?? "3001", 10);
+    await startServer(createServer, { port, name: "Basic MCP App Server (Preact)" });
+  }
+}
+
+main().catch((e) => {
+  console.error(e);
+  process.exit(1);
+});

examples/basic-server-preact/src/server-utils.ts

@@ -1,17 +1,30 @@
 {
-  "name": "basic-server-react",
-  "version": "1.0.0",
-  "private": true,
+  "name": "@modelcontextprotocol/server-basic-react",
+  "version": "0.1.0",
   "type": "module",
+  "description": "Basic MCP App Server example using React",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/modelcontextprotocol/ext-apps",
+    "directory": "examples/basic-server-react"
+  },
+  "license": "MIT",
+  "main": "server.ts",
+  "files": [
+    "server.ts",
+    "server-utils.ts",
+    "dist"
+  ],
   "scripts": {
     "build": "tsc --noEmit && cross-env INPUT=mcp-app.html vite build",
     "watch": "cross-env INPUT=mcp-app.html vite build --watch",
     "serve": "bun server.ts",
     "start": "cross-env NODE_ENV=development npm run build && npm run serve",
-    "dev": "cross-env NODE_ENV=development concurrently 'npm run watch' 'npm run serve'"
+    "dev": "cross-env NODE_ENV=development concurrently 'npm run watch' 'npm run serve'",
+    "prepublishOnly": "npm run build"
   },
   "dependencies": {
-    "@modelcontextprotocol/ext-apps": "../..",
+    "@modelcontextprotocol/ext-apps": "^0.2.2",
     "@modelcontextprotocol/sdk": "^1.24.0",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
@@ -26,6 +39,7 @@
     "@vitejs/plugin-react": "^4.3.4",
     "concurrently": "^9.2.1",
     "cors": "^2.8.5",
+    "cross-env": "^10.1.0",
     "express": "^5.1.0",
     "typescript": "^5.9.3",
     "vite": "^6.0.0",