chore: use mcp sdk via playwright (#973)

package-lock.json

@@ -9,16 +9,13 @@
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       "license": "Apache-2.0",
       "dependencies": {
-        "@modelcontextprotocol/sdk": "^1.16.0",
         "commander": "^13.1.0",
         "debug": "^4.4.1",
         "dotenv": "^17.2.0",
         "mime": "^4.0.7",
         "playwright": "1.56.0-alpha-1756505518000",
         "playwright-core": "1.56.0-alpha-1756505518000",
-        "ws": "^8.18.1",
-        "zod": "^3.24.1",
-        "zod-to-json-schema": "^3.24.4"
+        "ws": "^8.18.1"
       },
       "bin": {
         "mcp-server-playwright": "cli.js"
@@ -27,6 +24,7 @@
         "@anthropic-ai/sdk": "^0.57.0",
         "@eslint/eslintrc": "^3.2.0",
         "@eslint/js": "^9.19.0",
+        "@modelcontextprotocol/sdk": "^1.16.0",
         "@playwright/test": "1.56.0-alpha-1756505518000",
         "@stylistic/eslint-plugin": "^3.0.1",
         "@types/debug": "^4.1.12",
@@ -40,7 +38,9 @@
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         "eslint-plugin-notice": "^1.0.0",
         "openai": "^5.10.2",
-        "typescript": "^5.8.2"
+        "typescript": "^5.8.2",
+        "zod": "^3.24.1",
+        "zod-to-json-schema": "^3.24.4"
       },
       "engines": {
         "node": ">=18"
@@ -642,9 +642,10 @@
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     },
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+      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.17.4.tgz",
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+      "dev": true,
       "license": "MIT",
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@@ -1052,6 +1053,7 @@
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+      "dev": true,
       "license": "MIT",
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@@ -1088,6 +1090,7 @@
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+      "dev": true,
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@@ -1280,6 +1283,7 @@
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+      "dev": true,
       "license": "MIT",
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@@ -1324,6 +1328,7 @@
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+      "dev": true,
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@@ -1352,6 +1357,7 @@
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+      "dev": true,
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@@ -1365,6 +1371,7 @@
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+      "dev": true,
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@@ -1444,6 +1451,7 @@
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+      "dev": true,
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@@ -1456,15 +1464,17 @@
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+      "dev": true,
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+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.2.tgz",
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+      "dev": true,
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@@ -1474,6 +1484,7 @@
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+      "dev": true,
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@@ -1483,6 +1494,7 @@
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+      "dev": true,
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       "dependencies": {
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@@ -1496,6 +1508,7 @@
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+      "dev": true,
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@@ -1624,6 +1637,7 @@
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+      "dev": true,
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@@ -1658,6 +1672,7 @@
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@@ -1672,12 +1687,14 @@
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+      "dev": true,
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+      "dev": true,
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@@ -1753,6 +1770,7 @@
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@@ -1771,6 +1790,7 @@
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+      "dev": true,
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+      "dev": true,
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       "dependencies": {
-        "eventsource-parser": "^3.0.0"
+        "eventsource-parser": "^3.0.1"
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@@ -2218,6 +2242,7 @@
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@@ -2257,9 +2282,10 @@
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@@ -2268,13 +2294,14 @@
         "url": "https://github.com/sponsors/express-rate-limit"
       },
       "peerDependencies": {
-        "express": "^4.11 || 5 || ^5.0.0-beta.1"
+        "express": ">= 4.11"
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@@ -2731,10 +2769,21 @@
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       "version": "3.24.2",
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.24.2.tgz",
       "integrity": "sha512-lY7CDW43ECgW9u1TcT3IoXHflywfVqDYze4waEz812jR/bZ8FHDsl7pFQoSZTz5N+2NqRXs8GBwnAwo3ZNxqhQ==",
+      "dev": true,
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
@@ -4785,6 +4879,7 @@
       "version": "3.24.4",
       "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.24.4.tgz",
       "integrity": "sha512-0uNlcvgabyrni9Ag8Vghj21drk7+7tp7VTwwR7KxxXXc/3pbXz2PHlDgj3cICahgF1kHm4dExBFj7BXrZJXzig==",
+      "dev": true,
       "license": "ISC",
       "peerDependencies": {
         "zod": "^3.24.1"

package.json

@@ -38,21 +38,19 @@
     }
   },
   "dependencies": {
-    "@modelcontextprotocol/sdk": "^1.16.0",
     "commander": "^13.1.0",
     "debug": "^4.4.1",
     "dotenv": "^17.2.0",
     "mime": "^4.0.7",
     "playwright": "1.56.0-alpha-1756505518000",
     "playwright-core": "1.56.0-alpha-1756505518000",
-    "ws": "^8.18.1",
-    "zod": "^3.24.1",
-    "zod-to-json-schema": "^3.24.4"
+    "ws": "^8.18.1"
   },
   "devDependencies": {
     "@anthropic-ai/sdk": "^0.57.0",
     "@eslint/eslintrc": "^3.2.0",
     "@eslint/js": "^9.19.0",
+    "@modelcontextprotocol/sdk": "^1.16.0",
     "@playwright/test": "1.56.0-alpha-1756505518000",
     "@stylistic/eslint-plugin": "^3.0.1",
     "@types/debug": "^4.1.12",
@@ -66,7 +64,9 @@
     "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-notice": "^1.0.0",
     "openai": "^5.10.2",
-    "typescript": "^5.8.2"
+    "typescript": "^5.8.2",
+    "zod": "^3.24.1",
+    "zod-to-json-schema": "^3.24.4"
   },
   "bin": {
     "mcp-server-playwright": "cli.js"

src/loop/main.ts

@@ -19,10 +19,9 @@
 import path from 'path';
 import url from 'url';
 import dotenv from 'dotenv';
-
-import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
-import { Client } from '@modelcontextprotocol/sdk/client/index.js';
 import { program } from 'commander';
+
+import * as mcpBundle from '../mcp/bundle.js';
 import { OpenAIDelegate } from './loopOpenAI.js';
 import { ClaudeDelegate } from './loopClaude.js';
 import { runTask } from './loop.js';
@@ -34,7 +33,7 @@ dotenv.config();
 const __filename = url.fileURLToPath(import.meta.url);
 
 async function run(delegate: LLMDelegate) {
-  const transport = new StdioClientTransport({
+  const transport = new mcpBundle.StdioClientTransport({
     command: 'node',
     args: [
       path.resolve(__filename, '../../../cli.js'),
@@ -45,7 +44,7 @@ async function run(delegate: LLMDelegate) {
     env: process.env as Record<string, string>,
   });
 
-  const client = new Client({ name: 'test', version: '1.0.0' });
+  const client = new mcpBundle.Client({ name: 'test', version: '1.0.0' });
   await client.connect(transport);
   await client.ping();
 

src/loopTools/context.ts

@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-import { Client } from '@modelcontextprotocol/sdk/client/index.js';
 import { contextFactory } from '../browserContextFactory.js';
 import { BrowserServerBackend } from '../browserServerBackend.js';
 import { Context as BrowserContext } from '../context.js';
@@ -24,7 +23,9 @@ import { ClaudeDelegate } from '../loop/loopClaude.js';
 import { InProcessTransport } from '../mcp/inProcessTransport.js';
 import * as mcpServer from '../mcp/server.js';
 import { packageJSON } from '../utils/package.js';
+import * as mcpBundle from '../mcp/bundle.js';
 
+import type { Client } from '@modelcontextprotocol/sdk/client/index.js';
 import type { LLMDelegate } from '../loop/loop.js';
 import type { FullConfig } from '../config.js';
 
@@ -45,7 +46,7 @@ export class Context {
   }
 
   static async create(config: FullConfig) {
-    const client = new Client({ name: 'Playwright Proxy', version: packageJSON.version });
+    const client = new mcpBundle.Client({ name: 'Playwright Proxy', version: packageJSON.version });
     const browserContextFactory = contextFactory(config);
     const server = mcpServer.createServer('Playwright Subagent', packageJSON.version, new BrowserServerBackend(config, browserContextFactory), false);
     await client.connect(new InProcessTransport(server));

src/loopTools/perform.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTool } from './tool.js';
 
 const performSchema = z.object({

src/loopTools/snapshot.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from  '../mcp/bundle.js';
 import { defineTool } from './tool.js';
 
 export const snapshot = defineTool({

src/mcp/bundle.ts

@@ -0,0 +1,48 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// @ts-ignore
+import * as bundle from 'playwright/lib/mcpBundleImpl';
+
+const zodToJsonSchema: typeof import('zod-to-json-schema').zodToJsonSchema = bundle.zodToJsonSchema;
+const Client: typeof import('@modelcontextprotocol/sdk/client/index.js').Client = bundle.Client;
+const Server: typeof import('@modelcontextprotocol/sdk/server/index.js').Server = bundle.Server;
+const SSEServerTransport: typeof import('@modelcontextprotocol/sdk/server/sse.js').SSEServerTransport = bundle.SSEServerTransport;
+const StdioClientTransport: typeof import('@modelcontextprotocol/sdk/client/stdio.js').StdioClientTransport = bundle.StdioClientTransport;
+const StdioServerTransport: typeof import('@modelcontextprotocol/sdk/server/stdio.js').StdioServerTransport = bundle.StdioServerTransport;
+const StreamableHTTPServerTransport: typeof import('@modelcontextprotocol/sdk/server/streamableHttp.js').StreamableHTTPServerTransport = bundle.StreamableHTTPServerTransport;
+const StreamableHTTPClientTransport: typeof import('@modelcontextprotocol/sdk/client/streamableHttp.js').StreamableHTTPClientTransport = bundle.StreamableHTTPClientTransport;
+const CallToolRequestSchema: typeof import('@modelcontextprotocol/sdk/types.js').CallToolRequestSchema = bundle.CallToolRequestSchema;
+const ListRootsRequestSchema: typeof import('@modelcontextprotocol/sdk/types.js').ListRootsRequestSchema = bundle.ListRootsRequestSchema;
+const ListToolsRequestSchema: typeof import('@modelcontextprotocol/sdk/types.js').ListToolsRequestSchema = bundle.ListToolsRequestSchema;
+const PingRequestSchema: typeof import('@modelcontextprotocol/sdk/types.js').PingRequestSchema = bundle.PingRequestSchema;
+const z: typeof import('zod') = bundle.z;
+
+export {
+  zodToJsonSchema,
+  Client,
+  Server,
+  SSEServerTransport,
+  StdioClientTransport,
+  StdioServerTransport,
+  StreamableHTTPClientTransport,
+  StreamableHTTPServerTransport,
+  CallToolRequestSchema,
+  ListRootsRequestSchema,
+  ListToolsRequestSchema,
+  PingRequestSchema,
+  z,
+};

src/mcp/http.ts

@@ -21,11 +21,12 @@ import crypto from 'crypto';
 
 import debug from 'debug';
 
-import { SSEServerTransport } from '@modelcontextprotocol/sdk/server/sse.js';
-import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js';
+import * as mcpBundle from './bundle.js';
 import * as mcpServer from './server.js';
 
 import type { ServerBackendFactory } from './server.js';
+import type { SSEServerTransport } from '@modelcontextprotocol/sdk/server/sse.js';
+import type { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js';
 
 const testDebug = debug('pw:mcp:test');
 
@@ -86,7 +87,7 @@ async function handleSSE(serverBackendFactory: ServerBackendFactory, req: http.I
 
     return await transport.handlePostMessage(req, res);
   } else if (req.method === 'GET') {
-    const transport = new SSEServerTransport('/sse', res);
+    const transport = new mcpBundle.SSEServerTransport('/sse', res);
     sessions.set(transport.sessionId, transport);
     testDebug(`create SSE session: ${transport.sessionId}`);
     await mcpServer.connect(serverBackendFactory, transport, false);
@@ -114,7 +115,7 @@ async function handleStreamable(serverBackendFactory: ServerBackendFactory, req:
   }
 
   if (req.method === 'POST') {
-    const transport = new StreamableHTTPServerTransport({
+    const transport = new mcpBundle.StreamableHTTPServerTransport({
       sessionIdGenerator: () => crypto.randomUUID(),
       onsessioninitialized: async sessionId => {
         testDebug(`create http session: ${transport.sessionId}`);

src/mcp/mdb.ts

@@ -15,23 +15,20 @@
  */
 
 import debug from 'debug';
-import { z } from 'zod';
-
-import { Client } from '@modelcontextprotocol/sdk/client/index.js';
-import { PingRequestSchema } from '@modelcontextprotocol/sdk/types.js';
-import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/streamableHttp.js';
-import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
 
 import { defineToolSchema } from './tool.js';
+import * as mcpBundle from './bundle.js';
 import * as mcpServer from './server.js';
 import * as mcpHttp from './http.js';
 import { wrapInProcess } from './server.js';
 import { ManualPromise } from './manualPromise.js';
 
 import type { Transport } from '@modelcontextprotocol/sdk/shared/transport.js';
+import type { Client } from '@modelcontextprotocol/sdk/client/index.js';
 
 const mdbDebug = debug('pw:mcp:mdb');
 const errorsDebug = debug('pw:mcp:errors');
+const z = mcpBundle.z;
 
 export class MDBBackend implements mcpServer.ServerBackend {
   private _stack: { client: Client, toolNames: string[], resultPromise: ManualPromise<mcpServer.CallToolResult> | undefined }[] = [];
@@ -107,15 +104,15 @@ export class MDBBackend implements mcpServer.ServerBackend {
 
   private async _pushTools(params: { mcpUrl: string, introMessage?: string }): Promise<mcpServer.CallToolResult> {
     mdbDebug('pushing tools to the stack', params.mcpUrl);
-    const transport = new StreamableHTTPClientTransport(new URL(params.mcpUrl));
+    const transport = new mcpBundle.StreamableHTTPClientTransport(new URL(params.mcpUrl));
     await this._pushClient(transport, params.introMessage);
     return { content: [{ type: 'text', text: 'Tools pushed' }] };
   }
 
   private async _pushClient(transport: Transport, introMessage?: string): Promise<mcpServer.CallToolResult> {
     mdbDebug('pushing client to the stack');
-    const client = new Client({ name: 'Internal client', version: '0.0.0' });
-    client.setRequestHandler(PingRequestSchema, () => ({}));
+    const client = new mcpBundle.Client({ name: 'Internal client', version: '0.0.0' });
+    client.setRequestHandler(mcpBundle.PingRequestSchema, () => ({}));
     await client.connect(transport);
     mdbDebug('connected to the new client');
     const { tools } = await client.listTools();
@@ -162,7 +159,7 @@ export async function runMainBackend(backendFactory: mcpServer.ServerBackendFact
     return url;
 
   // Start stdio conditionally.
-  await mcpServer.connect(factory, new StdioServerTransport(), false);
+  await mcpServer.connect(factory, new mcpBundle.StdioServerTransport(), false);
 }
 
 export async function runOnPauseBackendLoop(mdbUrl: string, backend: ServerBackendOnPause, introMessage: string) {
@@ -179,9 +176,9 @@ export async function runOnPauseBackendLoop(mdbUrl: string, backend: ServerBacke
   await mcpHttp.installHttpTransport(httpServer, factory);
   const url = mcpHttp.httpAddressToString(httpServer.address());
 
-  const client = new Client({ name: 'Internal client', version: '0.0.0' });
-  client.setRequestHandler(PingRequestSchema, () => ({}));
-  const transport = new StreamableHTTPClientTransport(new URL(mdbUrl));
+  const client = new mcpBundle.Client({ name: 'Internal client', version: '0.0.0' });
+  client.setRequestHandler(mcpBundle.PingRequestSchema, () => ({}));
+  const transport = new mcpBundle.StreamableHTTPClientTransport(new URL(mdbUrl));
   await client.connect(transport);
 
   const pushToolsResult = await client.callTool({

src/mcp/proxyBackend.ts

@@ -15,15 +15,13 @@
  */
 
 import debug from 'debug';
-import { z } from 'zod';
-import { zodToJsonSchema } from 'zod-to-json-schema';
 
-import { Client } from '@modelcontextprotocol/sdk/client/index.js';
-import { ListRootsRequestSchema, PingRequestSchema } from '@modelcontextprotocol/sdk/types.js';
+import * as mcpBundle from './bundle.js';
 
 import type { ServerBackend, ClientVersion, Root, Server } from './server.js';
 import type { Transport } from '@modelcontextprotocol/sdk/shared/transport.js';
 import type { Tool, CallToolResult, CallToolRequest } from '@modelcontextprotocol/sdk/types.js';
+import type { Client } from '@modelcontextprotocol/sdk/client/index.js';
 
 export type MCPProvider = {
   name: string;
@@ -32,6 +30,7 @@ export type MCPProvider = {
 };
 
 const errorsDebug = debug('pw:mcp:errors');
+const { z, zodToJsonSchema } = mcpBundle;
 
 export class ProxyBackend implements ServerBackend {
   private _mcpProviders: MCPProvider[];
@@ -112,14 +111,14 @@ export class ProxyBackend implements ServerBackend {
     await this._currentClient?.close();
     this._currentClient = undefined;
 
-    const client = new Client({ name: 'Playwright MCP Proxy', version: '0.0.0' });
+    const client = new mcpBundle.Client({ name: 'Playwright MCP Proxy', version: '0.0.0' });
     client.registerCapabilities({
       roots: {
         listRoots: true,
       },
     });
-    client.setRequestHandler(ListRootsRequestSchema, () => ({ roots: this._roots }));
-    client.setRequestHandler(PingRequestSchema, () => ({}));
+    client.setRequestHandler(mcpBundle.ListRootsRequestSchema, () => ({ roots: this._roots }));
+    client.setRequestHandler(mcpBundle.PingRequestSchema, () => ({}));
 
     const transport = await factory.connect();
     await client.connect(transport);

src/mcp/server.ts

@@ -16,9 +16,7 @@
 
 import debug from 'debug';
 
-import { Server } from '@modelcontextprotocol/sdk/server/index.js';
-import { CallToolRequestSchema, ListToolsRequestSchema } from '@modelcontextprotocol/sdk/types.js';
-import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
+import * as mcpBundle from './bundle.js';
 import { httpAddressToString, installHttpTransport, startHttpServer } from './http.js';
 import { InProcessTransport } from './inProcessTransport.js';
 
@@ -26,6 +24,7 @@ import type { Tool, CallToolResult, CallToolRequest, Root } from '@modelcontextp
 import type { Transport } from '@modelcontextprotocol/sdk/shared/transport.js';
 export type { Server } from '@modelcontextprotocol/sdk/server/index.js';
 export type { Tool, CallToolResult, CallToolRequest, Root } from '@modelcontextprotocol/sdk/types.js';
+import type { Server } from '@modelcontextprotocol/sdk/server/index.js';
 
 const serverDebug = debug('pw:mcp:server');
 const errorsDebug = debug('pw:mcp:errors');
@@ -59,13 +58,13 @@ export async function wrapInProcess(backend: ServerBackend): Promise<Transport>
 export function createServer(name: string, version: string, backend: ServerBackend, runHeartbeat: boolean): Server {
   let initializedPromiseResolve = () => {};
   const initializedPromise = new Promise<void>(resolve => initializedPromiseResolve = resolve);
-  const server = new Server({ name, version }, {
+  const server = new mcpBundle.Server({ name, version }, {
     capabilities: {
       tools: {},
     }
   });
 
-  server.setRequestHandler(ListToolsRequestSchema, async () => {
+  server.setRequestHandler(mcpBundle.ListToolsRequestSchema, async () => {
     serverDebug('listTools');
     await initializedPromise;
     const tools = await backend.listTools();
@@ -73,7 +72,7 @@ export function createServer(name: string, version: string, backend: ServerBacke
   });
 
   let heartbeatRunning = false;
-  server.setRequestHandler(CallToolRequestSchema, async request => {
+  server.setRequestHandler(mcpBundle.CallToolRequestSchema, async request => {
     serverDebug('callTool', request);
     await initializedPromise;
 
@@ -135,7 +134,7 @@ function addServerListener(server: Server, event: 'close' | 'initialized', liste
 
 export async function start(serverBackendFactory: ServerBackendFactory, options: { host?: string; port?: number }) {
   if (options.port === undefined) {
-    await connect(serverBackendFactory, new StdioServerTransport(), false);
+    await connect(serverBackendFactory, new mcpBundle.StdioServerTransport(), false);
     return;
   }
 

src/mcp/tool.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { zodToJsonSchema } from 'zod-to-json-schema';
+import { zodToJsonSchema } from  '../mcp/bundle.js';
 
 import type { z } from 'zod';
 import type * as mcpServer from './server.js';

src/tools/DEPS.list

@@ -1,2 +1,3 @@
 [*]
 ../utils/
+../mcp/

src/tools/common.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTabTool, defineTool } from './tool.js';
 
 const close = defineTool({

src/tools/console.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 
 const console = defineTabTool({

src/tools/dialogs.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 
 const handleDialog = defineTabTool({

src/tools/evaluate.ts

@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
-
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 import * as javascript from '../utils/codegen.js';
 import { generateLocator } from './utils.js';

src/tools/files.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 
 const uploadFile = defineTabTool({

src/tools/form.ts

@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
-
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 import { generateLocator } from './utils.js';
 import * as javascript from '../utils/codegen.js';

src/tools/install.ts

@@ -16,10 +16,10 @@
 
 import { fork } from 'child_process';
 import path from 'path';
-import { fileURLToPath } from 'url';
-import { z } from 'zod';
-import { defineTool } from './tool.js';
+import url from 'url';
 
+import { z } from '../mcp/bundle.js';
+import { defineTool } from './tool.js';
 
 const install = defineTool({
   capability: 'core-install',
@@ -34,7 +34,7 @@ const install = defineTool({
   handle: async (context, params, response) => {
     const channel = context.config.browser?.launchOptions?.channel ?? context.config.browser?.browserName ?? 'chrome';
     const cliUrl = import.meta.resolve('playwright/package.json');
-    const cliPath = path.join(fileURLToPath(cliUrl), '..', 'cli.js');
+    const cliPath = path.join(url.fileURLToPath(cliUrl), '..', 'cli.js');
     const child = fork(cliPath, ['install', channel], {
       stdio: 'pipe',
     });

src/tools/keyboard.ts

@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
-
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 import { elementSchema } from './snapshot.js';
 import { generateLocator } from './utils.js';

src/tools/mouse.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 
 const elementSchema = z.object({

src/tools/navigate.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTool, defineTabTool } from './tool.js';
 
 const navigate = defineTool({

src/tools/network.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 
 import type * as playwright from 'playwright';

src/tools/pdf.ts

@@ -14,9 +14,8 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
-
 import * as javascript from '../utils/codegen.js';
 
 const pdfSchema = z.object({

src/tools/screenshot.ts

@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
-
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 import * as javascript from '../utils/codegen.js';
 import { generateLocator } from './utils.js';

src/tools/snapshot.ts

@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
-
+import { z } from '../mcp/bundle.js';
 import { defineTabTool, defineTool } from './tool.js';
 import * as javascript from '../utils/codegen.js';
 import { generateLocator } from './utils.js';

src/tools/tabs.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTool } from './tool.js';
 
 const browserTabs = defineTool({

src/tools/verify.ts

@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
-
+import { z } from '../mcp/bundle.js';
 import { defineTabTool } from './tool.js';
 import * as javascript from '../utils/codegen.js';
 import { generateLocator } from './utils.js';

src/tools/wait.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z } from 'zod';
+import { z } from '../mcp/bundle.js';
 import { defineTool } from './tool.js';
 
 const wait = defineTool({

src/utils/fileUtils.ts

@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-import os from 'node:os';
-import path from 'node:path';
+import os from 'os';
+import path from 'path';
 
 export function cacheDir() {
   let cacheDirectory: string;

src/vscode/host.ts

@@ -14,15 +14,10 @@
  * limitations under the License.
  */
 
-import { fileURLToPath } from 'url';
+import url from 'url';
 import path from 'path';
-import { z } from 'zod';
-import { zodToJsonSchema } from 'zod-to-json-schema';
 
-
-import { Client } from '@modelcontextprotocol/sdk/client/index.js';
-import { ListRootsRequestSchema, PingRequestSchema } from '@modelcontextprotocol/sdk/types.js';
-import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
+import * as mcpBundle from '../mcp/bundle.js';
 import * as mcpServer from '../mcp/server.js';
 import { logUnhandledError } from '../utils/log.js';
 import { packageJSON } from '../utils/package.js';
@@ -30,10 +25,15 @@ import { packageJSON } from '../utils/package.js';
 import { FullConfig } from '../config.js';
 import { BrowserServerBackend } from '../browserServerBackend.js';
 import { contextFactory } from '../browserContextFactory.js';
+
+import type { z as zod } from 'zod';
 import type { Transport } from '@modelcontextprotocol/sdk/shared/transport.js';
 import type { ClientVersion, ServerBackend } from '../mcp/server.js';
 import type { Root, Tool, CallToolResult, CallToolRequest } from '@modelcontextprotocol/sdk/types.js';
 import type { Browser, BrowserContext, BrowserServer } from 'playwright';
+import type { Client } from '@modelcontextprotocol/sdk/client/index.js';
+
+const { z, zodToJsonSchema } = mcpBundle;
 
 const contextSwitchOptions = z.object({
   connectionString: z.string().optional().describe('The connection string to use to connect to the browser'),
@@ -111,7 +111,7 @@ class VSCodeProxyBackend implements ServerBackend {
     return url.toString();
   }
 
-  private async _callContextSwitchTool(params: z.infer<typeof contextSwitchOptions>): Promise<CallToolResult> {
+  private async _callContextSwitchTool(params: zod.infer<typeof contextSwitchOptions>): Promise<CallToolResult> {
     if (params.debugController) {
       const url = await this._getDebugControllerURL();
       const lines = [`### Result`];
@@ -133,11 +133,11 @@ class VSCodeProxyBackend implements ServerBackend {
     }
 
     await this._setCurrentClient(
-        new StdioClientTransport({
+        new mcpBundle.StdioClientTransport({
           command: process.execPath,
           cwd: process.cwd(),
           args: [
-            path.join(fileURLToPath(import.meta.url), '..', 'main.js'),
+            path.join(url.fileURLToPath(import.meta.url), '..', 'main.js'),
             JSON.stringify(this._config),
             params.connectionString,
             params.lib,
@@ -166,14 +166,14 @@ class VSCodeProxyBackend implements ServerBackend {
     await this._currentClient?.close();
     this._currentClient = undefined;
 
-    const client = new Client(this._clientVersion!);
+    const client = new mcpBundle.Client(this._clientVersion!);
     client.registerCapabilities({
       roots: {
         listRoots: true,
       },
     });
-    client.setRequestHandler(ListRootsRequestSchema, () => ({ roots: this._roots }));
-    client.setRequestHandler(PingRequestSchema, () => ({}));
+    client.setRequestHandler(mcpBundle.ListRootsRequestSchema, () => ({ roots: this._roots }));
+    client.setRequestHandler(mcpBundle.PingRequestSchema, () => ({}));
 
     await client.connect(transport);
     this._currentClient = client;

src/vscode/main.ts

@@ -14,10 +14,11 @@
  * limitations under the License.
  */
 
-import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
+import * as mcpBundle from '../mcp/bundle.js';
 import * as mcpServer from '../mcp/server.js';
 import { BrowserServerBackend } from '../browserServerBackend.js';
 import { BrowserContextFactory, ClientInfo } from '../browserContextFactory.js';
+
 import type { FullConfig } from '../config.js';
 import type { BrowserContext } from 'playwright-core';
 
@@ -63,7 +64,7 @@ async function main(config: FullConfig, connectionString: string, lib: string) {
         create: () => new BrowserServerBackend(config, factory),
         version: 'unused'
       },
-      new StdioServerTransport(),
+      new mcpBundle.StdioServerTransport(),
       false
   );
 }

utils/check-deps.js

@@ -21,8 +21,12 @@
 import fs from 'fs';
 import ts from 'typescript';
 import path from 'path';
+import Module from 'module';
 
 const __dirname = path.dirname(new URL(import.meta.url).pathname);
+const require = Module.createRequire(import.meta.url);
+
+const builtins = new Set(Module.builtinModules);
 
 const depsCache = {};
 const packageRoot = path.resolve(__dirname, '..');
@@ -31,6 +35,13 @@ async function checkDeps() {
   const deps = new Set();
   const src = path.join(packageRoot, 'src');
 
+
+  let packageJSON;
+  try {
+    packageJSON = require(path.resolve(path.join(packageRoot, 'package.json')));
+  } catch {
+  }
+
   const program = ts.createProgram({
     options: {
       allowJs: true,
@@ -53,6 +64,25 @@ async function checkDeps() {
     process.exit(1);
   }
 
+  if (packageJSON) {
+    for (const dep of deps) {
+      const resolved = require.resolve(dep, { paths: [packageRoot] });
+      if (dep === resolved || !resolved.includes('node_modules'))
+        deps.delete(dep);
+    }
+    for (const dep of Object.keys(packageJSON.dependencies || {}))
+      deps.delete(dep);
+
+    if (deps.size) {
+      console.log('Dependencies are not declared in package.json:');
+      for (const dep of deps)
+        console.log(`  ${dep}`);
+      process.exit(1);
+    }
+  }
+
+  return packageJSON;
+
   function visit(node, fileName, text) {
     if (ts.isImportDeclaration(node) && ts.isStringLiteral(node.moduleSpecifier)) {
       if (node.importClause) {
@@ -94,10 +124,21 @@ async function checkDeps() {
             return;
       }
 
+      let depName;
       if (importName.startsWith('@'))
-        deps.add(importName.split('/').slice(0, 2).join('/'));
+        depName = importName.split('/').slice(0, 2).join('/');
       else
-        deps.add(importName.split('/')[0]);
+        depName = importName.split('/')[0];
+      deps.add(depName);
+      try {
+        require.resolve(depName, { paths: [packageRoot] })
+      } catch (e) {
+        console.log(`Invalid dependency ${depName} in ${fileName}`);
+        process.exit(1);
+      }
+
+      if (!allowExternalImport(importName, packageJSON))
+        errors.push(`Disallowed external dependency ${importName} from ${path.relative(packageRoot, fileName)}`);
     }
     ts.forEachChild(node, x => visit(x, fileName, text));
   }
@@ -154,6 +195,19 @@ async function checkDeps() {
     }
     return false;
   }
+
+  function allowExternalImport(importName, packageJSON) {
+    // Only external imports are relevant. Files in src/web are bundled via webpack.
+    if (importName.startsWith('.') || (importName.startsWith('@') && !importName.startsWith('@playwright/')))
+      return true;
+    if (!packageJSON)
+      return false;
+    const match = importName.match(/(@[\w-]+\/)?([^/]+)/);
+    const dependency = match[1] ? match[1] + match[2] : match[2];
+    if (builtins.has(dependency))
+      return true;
+    return !!(packageJSON.dependencies || {})[dependency];
+  }
 }
 
 function listAllFiles(dir) {