Selenium MCP Server

Instructions

Implementation Reference

• src/tools/browserTools.ts:291-324 (handler)

  Full implementation of the 'browser_switch_to_window_by_title' tool, including inline schema and handler logic. The handler loops through all browser window handles, switches to each, retrieves the title, and remains on the window matching the provided title or reports not found.
  server.tool( 'browser_switch_to_window_by_title', 'Switch to a window by its title', { title: z.string().describe('The title of the window to switch to'), }, async ({ title }) => { try { const driver = stateManager.getDriver(); const windowHandles = await driver.getAllWindowHandles(); for (const handle of windowHandles) { await driver.switchTo().window(handle); const currentTitle = await driver.getTitle(); if (currentTitle === title) { return { content: [{ type: 'text', text: `Switched to window: ${title}` }], }; } } return { content: [{ type: 'text', text: `Window with title '${title}' not found` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error switching to window by title: ${(e as Error).message}`, }, ], }; } } );
• src/tools/browserTools.ts:294-296 (schema)

  Zod input schema for the tool requiring a 'title' string parameter.
  { title: z.string().describe('The title of the window to switch to'), },
• src/tools/index.ts:9-9 (registration)

  Invocation of registerBrowserTools within the top-level registerAllTools function, which registers the browser tools including 'browser_switch_to_window_by_title'.
  registerBrowserTools(server, stateManager);
• src/tools/browserTools.ts:7-424 (registration)

  The registerBrowserTools function that contains all browser tool registrations, including the target tool.
  export function registerBrowserTools(server: McpServer, stateManager: StateManager) { server.tool( 'browser_open', 'Open a new browser session', { browser: z.enum(['chrome', 'firefox', 'edge', 'safari']).describe('Browser to launch'), options: browserOptionsSchema, }, async ({ browser, options = {} }) => { try { const driver = await BrowserService.createDriver(browser, { ...options, headless: typeof options.headless === 'boolean' ? options.headless : false, arguments: options.arguments ?? [], }); const sessionId = `${browser}_${Date.now()}`; stateManager.addDriver(sessionId, driver); stateManager.setCurrentSession(sessionId); return { content: [ { type: 'text', text: `Browser started with session_id: ${sessionId}`, }, ], }; } catch (e) { return { content: [ { type: 'text', text: `Error starting browser: ${(e as Error).message}`, }, ], }; } } ); server.tool( 'browser_navigate', 'Navigate to a URL', { url: z.string().describe('URL to navigate to'), }, async ({ url }) => { try { const driver = stateManager.getDriver(); await driver.get(url); return { content: [{ type: 'text', text: `Navigated to ${url}` }], }; } catch (e) { return { content: [{ type: 'text', text: `Error navigating: ${(e as Error).message}` }], }; } } ); server.tool('browser_navigate_back', 'Navigate back in the browser', {}, async () => { try { const driver = stateManager.getDriver(); await driver.navigate().back(); return { content: [{ type: 'text', text: `Navigated back` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error navigating back: ${(e as Error).message}`, }, ], }; } }); server.tool('browser_navigate_forward', 'Navigate forward in the browser', {}, async () => { try { const driver = stateManager.getDriver(); await driver.navigate().forward(); return { content: [{ type: 'text', text: `Navigated forward` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error navigating forward: ${(e as Error).message}`, }, ], }; } }); server.tool('browser_title', 'Get the current page title', {}, async () => { try { const driver = stateManager.getDriver(); const title = await driver.getTitle(); return { content: [{ type: 'text', text: `Current page title is: ${title}` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error getting page title: ${(e as Error).message}`, }, ], }; } }); server.tool('browser_get_url', 'Get the current page URL', {}, async () => { try { const driver = stateManager.getDriver(); const url = await driver.getCurrentUrl(); return { content: [{ type: 'text', text: `Current page URL is: ${url}` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error getting page URL: ${(e as Error).message}`, }, ], }; } }); server.tool('browser_get_page_source', 'Get the current page source', {}, async () => { try { const driver = stateManager.getDriver(); const pageSource = await driver.getPageSource(); return { content: [{ type: 'text', text: `Current page source is: ${pageSource}` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error getting page source: ${(e as Error).message}`, }, ], }; } }); server.tool('browser_maximize', 'Maximize the browser window', {}, async () => { try { const driver = stateManager.getDriver(); await driver.manage().window().maximize(); return { content: [{ type: 'text', text: `Browser window maximised` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error maximising browser window: ${(e as Error).message}`, }, ], }; } }); server.tool( 'browser_resize', 'Resize the browser window', { width: z.number().describe('New width of the browser window'), height: z.number().describe('New height of the browser window'), }, async ({ width, height }) => { try { const driver = stateManager.getDriver(); await driver.manage().window().setRect({ width, height }); return { content: [ { type: 'text', text: `Browser window resized to ${width}x${height}`, }, ], }; } catch (e) { return { content: [ { type: 'text', text: `Error resizing browser window: ${(e as Error).message}`, }, ], }; } } ); server.tool('browser_refresh', 'Refresh the current page', {}, async () => { try { const driver = stateManager.getDriver(); await driver.navigate().refresh(); return { content: [{ type: 'text', text: `Browser refreshed` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error refreshing browser: ${(e as Error).message}`, }, ], }; } }); server.tool( 'browser_switch_to_window', 'Switch to a different browser window', { windowHandle: z.string().describe('The handle of the window to switch to'), }, async ({ windowHandle }) => { try { const driver = stateManager.getDriver(); await driver.switchTo().window(windowHandle); return { content: [{ type: 'text', text: `Switched to window: ${windowHandle}` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error switching window: ${(e as Error).message}`, }, ], }; } } ); server.tool('browser_switch_to_original_window', 'Switches back to the original browser window', {}, async () => { try { const driver = stateManager.getDriver(); const windowHandles = await driver.getAllWindowHandles(); const originalHandle = windowHandles[0]; if (!originalHandle) { return { content: [ { type: 'text', text: `No original window handle found.`, }, ], }; } await driver.switchTo().window(originalHandle); return { content: [{ type: 'text', text: `Switched to original window` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error switching to original window: ${(e as Error).message}`, }, ], }; } }); server.tool( 'browser_switch_to_window_by_title', 'Switch to a window by its title', { title: z.string().describe('The title of the window to switch to'), }, async ({ title }) => { try { const driver = stateManager.getDriver(); const windowHandles = await driver.getAllWindowHandles(); for (const handle of windowHandles) { await driver.switchTo().window(handle); const currentTitle = await driver.getTitle(); if (currentTitle === title) { return { content: [{ type: 'text', text: `Switched to window: ${title}` }], }; } } return { content: [{ type: 'text', text: `Window with title '${title}' not found` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error switching to window by title: ${(e as Error).message}`, }, ], }; } } ); server.tool( 'browser_switch_window_by_index', 'Switch to a window by its index', { index: z.number().describe('The index of the window to switch to'), }, async ({ index }) => { try { const driver = stateManager.getDriver(); const windowHandles = await driver.getAllWindowHandles(); if (index < 0 || index >= windowHandles.length) { return { content: [{ type: 'text', text: `Invalid window index: ${index}` }], }; } const handle = windowHandles[index]; if (!handle) { return { content: [{ type: 'text', text: `No window handle found at index: ${index}` }], }; } await driver.switchTo().window(handle); return { content: [{ type: 'text', text: `Switched to window at index: ${index}` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error switching to window by index: ${(e as Error).message}`, }, ], }; } } ); server.tool( 'browser_switch_to_window_by_url', 'Switch to a window by its URL', { url: z.string().describe('The URL of the window to switch to'), }, async ({ url }) => { try { const driver = stateManager.getDriver(); const windowHandles = await driver.getAllWindowHandles(); for (const handle of windowHandles) { await driver.switchTo().window(handle); const currentUrl = await driver.getCurrentUrl(); if (currentUrl === url) { return { content: [{ type: 'text', text: `Switched to window: ${url}` }], }; } } return { content: [{ type: 'text', text: `Window with URL '${url}' not found` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error switching to window by URL: ${(e as Error).message}`, }, ], }; } } ); server.tool('browser_close', 'Close the current browser session', {}, async () => { try { const driver = stateManager.getDriver(); await driver.quit(); const sessionId = stateManager.getCurrentSession(); if (sessionId) { stateManager.removeDriver(sessionId); } stateManager.resetCurrentSession(); return { content: [{ type: 'text', text: `Browser session ${sessionId} closed` }], }; } catch (e) { return { content: [ { type: 'text', text: `Error closing session: ${(e as Error).message}`, }, ], }; } }); }