context.ts•2.96 kB
/**
* 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 { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { contextFactory } from '../browserContextFactory.js';
import { BrowserServerBackend } from '../browserServerBackend.js';
import { Context as BrowserContext } from '../context.js';
import { runTask } from '../loop/loop.js';
import { OpenAIDelegate } from '../loop/loopOpenAI.js';
import { ClaudeDelegate } from '../loop/loopClaude.js';
import { InProcessTransport } from '../mcp/inProcessTransport.js';
import * as mcpServer from '../mcp/server.js';
import type { LLMDelegate } from '../loop/loop.js';
import type { FullConfig } from '../config.js';
export class Context {
readonly config: FullConfig;
private _client: Client;
private _delegate: LLMDelegate;
constructor(config: FullConfig, client: Client) {
this.config = config;
this._client = client;
if (process.env.OPENAI_API_KEY)
this._delegate = new OpenAIDelegate();
else if (process.env.ANTHROPIC_API_KEY)
this._delegate = new ClaudeDelegate();
else
throw new Error('No LLM API key found. Please set OPENAI_API_KEY or ANTHROPIC_API_KEY environment variable.');
}
static async create(config: FullConfig) {
const client = new Client({ name: 'Playwright Proxy', version: '1.0.0' });
const browserContextFactory = contextFactory(config);
const server = mcpServer.createServer(new BrowserServerBackend(config, [browserContextFactory]), false);
await client.connect(new InProcessTransport(server));
await client.ping();
return new Context(config, client);
}
async runTask(task: string, oneShot: boolean = false): Promise<mcpServer.ToolResponse> {
const messages = await runTask(this._delegate, this._client!, task, oneShot);
const lines: string[] = [];
// Skip the first message, which is the user's task.
for (const message of messages.slice(1)) {
// Trim out all page snapshots.
if (!message.content.trim())
continue;
const index = oneShot ? -1 : message.content.indexOf('### Page state');
const trimmedContent = index === -1 ? message.content : message.content.substring(0, index);
lines.push(`[${message.role}]:`, trimmedContent);
}
return {
content: [{ type: 'text', text: lines.join('\n') }],
};
}
async close() {
await BrowserContext.disposeAll();
}
}