MCP Accessibility Scanner

Instructions

Implementation Reference

• src/tools/tabs.ts:35-60 (handler)

  The handler function for the 'browser_tabs' tool. For action 'new', it calls context.newTab() to create a new browser tab and includes tabs in the response.

  handle: async (context, params, response) => {
    switch (params.action) {
      case 'list': {
        await context.ensureTab();
        response.setIncludeTabs();
        return;
      }
      case 'new': {
        await context.newTab();
        response.setIncludeTabs();
        return;
      }
      case 'close': {
        await context.closeTab(params.index);
        response.setIncludeSnapshot();
        return;
      }
      case 'select': {
        if (params.index === undefined)
          throw new Error('Tab index is required');
        await context.selectTab(params.index);
        response.setIncludeSnapshot();
        return;
      }
    }
  },

• src/tools/tabs.ts:25-34 (schema)

  The schema definition for the 'browser_tabs' tool, which supports 'new' action to create a new tab.

  schema: {
    name: 'browser_tabs',
    title: 'Manage tabs',
    description: 'List, create, close, or select a browser tab.',
    inputSchema: z.object({
      action: z.enum(['list', 'new', 'close', 'select']).describe('Operation to perform'),
      index: z.number().optional().describe('Tab index, used for close/select. If omitted for close, current tab is closed.'),
    }),
    type: 'destructive',
  },

• src/context.ts:85-90 (helper)

  Core implementation of creating a new tab by calling browserContext.newPage() and updating current tab.

  async newTab(): Promise<Tab> {
    const { browserContext } = await this._ensureBrowserContext();
    const page = await browserContext.newPage();
    this._currentTab = this._tabs.find(t => t.page === page)!;
    return this._currentTab;
  }

• src/tools.ts:38-56 (registration)

  Registration of all tools, including the tabs tools (which exports browser_tabs) into the allTools array used by the MCP backend.

  export const allTools: Tool<any>[] = [
    ...common,
    ...console,
    ...dialogs,
    ...evaluate,
    ...files,
    ...form,
    ...install,
    ...keyboard,
    ...navigate,
    ...network,
    ...mouse,
    ...pdf,
    ...screenshot,
    ...snapshot,
    ...tabs,
    ...wait,
    ...verify,
  ];

• src/tools.ts:30-30 (registration)

  Import of tabs module containing browser_tabs tool.

  import tabs from './tools/tabs.js';