fix(agents): use cmd /c npx on Windows for init-agents MCP config

packages/playwright/src/agents/generateAgents.ts

@@ -45,12 +45,12 @@
     for (const agent of agents)
       await writeFile(`.claude/agents/${agent.name}.md`, ClaudeGenerator.agentSpec(agent), '🤖', 'agent definition');
 
+    const mcpServer = process.platform === 'win32'
+        ? { command: 'cmd', args: ['/c', 'npx', 'playwright', 'run-test-mcp-server'] }
+        : { command: 'npx', args: ['playwright', 'run-test-mcp-server'] };
     await writeFile('.mcp.json', JSON.stringify({
       mcpServers: {
-        'playwright-test': {
-          command: 'npx',
-          args: ['playwright', 'run-test-mcp-server'],
-        }
+        'playwright-test': mcpServer,
       }
     }, null, 2), '🔧', 'mcp configuration');
 

tests/mcp/init-agents.spec.ts

@@ -72,3 +72,21 @@
   });
   expect(fs.existsSync(path.join(baseDir, 'custom', 'bar', 'e2e', 'seed.spec.ts'))).toBe(true);
 });
+
+test('claude generates correct mcp config', async ({  }) => {
+  const baseDir = await writeFiles({
+    'playwright.config.ts': `module.exports = {};`,
+  });
+
+  await runInitAgents({ cwd: baseDir, args: ['--loop', 'claude'] });
+
+  const mcpJson = JSON.parse(fs.readFileSync(path.join(baseDir, '.mcp.json'), 'utf-8'));
+  if (process.platform === 'win32') {
+    expect(mcpJson.mcpServers['playwright-test'].command).toBe('cmd');
+    expect(mcpJson.mcpServers['playwright-test'].args).toEqual(['/c', 'npx', 'playwright', 'run-test-mcp-server']);
+  } else {
+    expect(mcpJson.mcpServers['playwright-test'].command).toBe('npx');
+    expect(mcpJson.mcpServers['playwright-test'].args).toEqual(['playwright', 'run-test-mcp-server']);
+  }
+});
+