playwright_expect_response
Initiate waiting for a specific HTTP response in Playwright by specifying a unique ID and URL pattern. Later, retrieve and validate the response using the Playwright_assert_response tool.
Instructions
Ask Playwright to start waiting for a HTTP response. This tool initiates the wait operation but does not wait for its completion.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| id | Yes | Unique & arbitrary identifier to be used for retrieving this response later with `Playwright_assert_response`. | |
| url | Yes | URL pattern to match in the response. |
Implementation Reference
- src/tools/browser/response.ts:21-44 (handler)ExpectResponseTool class with execute method that initiates page.waitForResponse(url) and stores the promise in a map keyed by the provided id.
export class ExpectResponseTool extends BrowserToolBase { /** * Execute the expect response tool */ async execute( args: ExpectResponseArgs, context: ToolContext ): Promise<ToolResponse> { return this.safeExecute(context, async (page) => { if (!args.id || !args.url) { return createErrorResponse( "Missing required parameters: id and url must be provided" ); } const responsePromise = page.waitForResponse(args.url); responsePromises.set(args.id, responsePromise); return createSuccessResponse( `Started waiting for response with ID ${args.id}` ); }); } } - src/tools.ts:282-293 (schema)Tool schema definition specifying input parameters 'id' (string) and 'url' (string).
{ name: "playwright_expect_response", description: "Ask Playwright to start waiting for a HTTP response. This tool initiates the wait operation but does not wait for its completion.", inputSchema: { type: "object", properties: { id: { type: "string", description: "Unique & arbitrary identifier to be used for retrieving this response later with `Playwright_assert_response`." }, url: { type: "string", description: "URL pattern to match in the response." } }, required: ["id", "url"], }, }, - src/toolHandler.ts:486-487 (registration)Registration in the main tool handler switch statement, delegating execution to ExpectResponseTool instance.
case "playwright_expect_response": return await expectResponseTool.execute(args, context); - src/toolHandler.ts:296-296 (registration)Instantiation of the ExpectResponseTool class instance used by the handler.
if (!expectResponseTool) expectResponseTool = new ExpectResponseTool(server); - Helper method in codegen generator to produce Playwright test code for this tool.
private generateExpectResponseStep(parameters: Record<string, unknown>): string { const { url, id } = parameters; return ` // Wait for response const ${id}Response = page.waitForResponse('${url}');`; }