@ai-coding-labs/playwright-mcp-plus
Version:
Enhanced Playwright Tools for MCP with Project Session Isolation
54 lines (53 loc) • 2.25 kB
JavaScript
/**
* 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.
*/
import { z } from 'zod';
import { defineTabTool } from './tool.js';
import * as javascript from '../javascript.js';
import { generateLocator } from './utils.js';
const evaluateSchema = z.object({
function: z.string().describe('() => { /* code */ } or (element) => { /* code */ } when element is provided'),
element: z.string().optional().describe('Human-readable element description used to obtain permission to interact with the element'),
ref: z.string().optional().describe('Exact target element reference from the page snapshot'),
});
const evaluate = defineTabTool({
capability: 'core',
schema: {
name: 'browser_evaluate',
title: 'Evaluate JavaScript',
description: 'Evaluate JavaScript expression on page or element',
inputSchema: evaluateSchema,
type: 'destructive',
},
handle: async (tab, params, response) => {
response.setIncludeSnapshot();
let locator;
if (params.ref && params.element) {
locator = await tab.refLocator({ ref: params.ref, element: params.element });
response.addCode(`await page.${await generateLocator(locator)}.evaluate(${javascript.quote(params.function)});`);
}
else {
response.addCode(`await page.evaluate(${javascript.quote(params.function)});`);
}
await tab.waitForCompletion(async () => {
const receiver = locator ?? tab.page;
const result = await receiver._evaluateFunction(params.function);
response.addResult(JSON.stringify(result, null, 2) || 'undefined');
});
},
});
export default [
evaluate,
];