diff --git a/packages/playwright-test/src/reporters/blob.ts b/packages/playwright-test/src/reporters/blob.ts
index 9d02b1eddb..057caab010 100644
--- a/packages/playwright-test/src/reporters/blob.ts
+++ b/packages/playwright-test/src/reporters/blob.ts
@@ -16,7 +16,7 @@
 
 import fs from 'fs';
 import path from 'path';
-import { ManualPromise, calculateSha1, createGuid, removeFolders, sanitizeForFilePath } from 'playwright-core/lib/utils';
+import { ManualPromise, calculateSha1, createGuid, getUserAgent, removeFolders, sanitizeForFilePath } from 'playwright-core/lib/utils';
 import { mime } from 'playwright-core/lib/utilsBundle';
 import { Readable } from 'stream';
 import type { EventEmitter } from 'events';
@@ -35,6 +35,7 @@ export const currentBlobReportVersion = 1;
 
 export type BlobReportMetadata = {
   version: number;
+  userAgent: string;
   name?: string;
   shard?: { total: number, current: number };
 };
@@ -55,6 +56,7 @@ export class BlobReporter extends TeleReporterEmitter {
   override onConfigure(config: FullConfig) {
     const metadata: BlobReportMetadata = {
       version: currentBlobReportVersion,
+      userAgent: getUserAgent(),
       name: process.env.PWTEST_BLOB_REPORT_NAME,
       shard: config.shard ?? undefined,
     };
diff --git a/tests/playwright-test/reporter-blob.spec.ts b/tests/playwright-test/reporter-blob.spec.ts
index 02f99674e8..5833add035 100644
--- a/tests/playwright-test/reporter-blob.spec.ts
+++ b/tests/playwright-test/reporter-blob.spec.ts
@@ -23,6 +23,7 @@ import { startHtmlReportServer } from '../../packages/playwright-test/lib/report
 import { expect as baseExpect, test as baseTest, stripAnsi } from './playwright-test-fixtures';
 import extractZip from '../../packages/playwright-core/bundles/zip/node_modules/extract-zip';
 import * as yazl from '../../packages/playwright-core/bundles/zip/node_modules/yazl';
+import { getUserAgent } from '../../packages/playwright-core/lib/utils/userAgent';
 import { Readable } from 'stream';
 
 const DOES_NOT_SUPPORT_UTF8_IN_TERMINAL = process.platform === 'win32' && process.env.TERM_PROGRAM !== 'vscode' && !process.env.WT_SESSION;
@@ -1200,7 +1201,8 @@ test('blob report should include version', async ({ runInlineTest }) => {
       test('test 1', async ({}) => {});
     `,
   };
-  await runInlineTest(files);
+  // CI/1 is a part of user agent string, make sure it matches in the nested test runner.
+  await runInlineTest(files, undefined, { CI: process.env.CI });
   const reportFiles = await fs.promises.readdir(reportDir);
   expect(reportFiles).toEqual(['report.zip']);
 
@@ -1210,6 +1212,7 @@ test('blob report should include version', async ({ runInlineTest }) => {
   const events = data.split('\n').filter(Boolean).map(line => JSON.parse(line));
   const metadataEvent = events.find(e => e.method === 'onBlobReportMetadata');
   expect(metadataEvent.params.version).toBe(1);
+  expect(metadataEvent.params.userAgent).toBe(getUserAgent());
 });
 
 test('merge-reports should throw if report version is from the future', async ({ runInlineTest, mergeReports }) => {