tauri_webview_find_element
Read-only
Locate DOM elements in Tauri app webviews for UI automation and debugging. Specify selectors to identify elements during testing sessions.
Instructions
[Tauri Apps Only] Find DOM elements in a running Tauri app's webview. Requires active tauri_driver_session. Targets the only connected app, or the default app if multiple are connected. Specify appIdentifier (port or bundle ID) to target a specific app. For browser pages or documentation sites, use Chrome DevTools MCP instead.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| windowId | No | Window label to target (defaults to "main") | |
| appIdentifier | No | App port or bundle ID to target. Defaults to the only connected app or the default app if multiple are connected. | |
| selector | Yes | ||
| strategy | No | css |
Implementation Reference
- Core handler function 'findElement' that constructs the script parameters and executes the find-element script in the target Tauri webview window.
export interface FindElementOptions { selector: string; strategy: string; windowId?: string; appIdentifier?: string | number; } /** * Find an element using various selector strategies. */ export async function findElement(options: FindElementOptions): Promise<string> { const { selector, strategy, windowId, appIdentifier } = options; const script = buildScript(SCRIPTS.findElement, { selector, strategy }); try { return await executeInWebview(script, windowId, appIdentifier); } catch(error: unknown) { const message = error instanceof Error ? error.message : String(error); throw new Error(`Find element failed: ${message}`); } } - Zod input schema validation for the tool parameters: selector (string) and strategy (css|xpath|text, default css), extending shared WindowTargetSchema.
export const FindElementSchema = WindowTargetSchema.extend({ selector: z.string(), strategy: z.enum([ 'css', 'xpath', 'text' ]).default('css'), }); - packages/mcp-server/src/tools-registry.ts:251-275 (registration)Tool registration in the central TOOLS array, defining name, description, category, schema reference, annotations, and thin wrapper handler that parses input and delegates to findElement implementation.
{ name: 'tauri_webview_find_element', description: '[Tauri Apps Only] Find DOM elements in a running Tauri app\'s webview. ' + 'Requires active tauri_driver_session. ' + MULTI_APP_DESC + ' ' + 'For browser pages or documentation sites, use Chrome DevTools MCP instead.', category: TOOL_CATEGORIES.UI_AUTOMATION, schema: FindElementSchema, annotations: { title: 'Find Element in Tauri Webview', readOnlyHint: true, openWorldHint: false, }, handler: async (args) => { const parsed = FindElementSchema.parse(args); return await findElement({ selector: parsed.selector, strategy: parsed.strategy, windowId: parsed.windowId, appIdentifier: parsed.appIdentifier, }); }, }, - Injected JavaScript IIFE that implements the element search logic: CSS querySelector, XPath via document.evaluate, or text-based XPath. Returns truncated outerHTML on success or 'not found'.
/** * Find an element using various selector strategies * * @param {Object} params * @param {string} params.selector - Element selector * @param {string} params.strategy - Selector strategy: 'css', 'xpath', or 'text' */ (function(params) { const { selector, strategy } = params; let element; if (strategy === 'text') { // Find element containing text const xpath = "//*[contains(text(), '" + selector + "')]"; const result = document.evaluate( xpath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null ); element = result.singleNodeValue; } else if (strategy === 'xpath') { // XPath selector const result = document.evaluate( selector, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null ); element = result.singleNodeValue; } else { // CSS selector (default) element = document.querySelector(selector); } if (element) { const outerHTML = element.outerHTML; // Truncate very long HTML to avoid overwhelming output const truncated = outerHTML.length > 5000 ? outerHTML.substring(0, 5000) + '...' : outerHTML; return 'Found element: ' + truncated; } return 'Element not found'; })