diff --git a/src/agent/composer.json b/src/agent/composer.json
index 3fc57d34a..823cb164d 100644
--- a/src/agent/composer.json
+++ b/src/agent/composer.json
@@ -34,6 +34,8 @@
},
"require-dev": {
"mrmysql/youtube-transcript": "^0.0.5",
+ "nyholm/psr7": "^1.8",
+ "php-http/discovery": "^1.19",
"phpstan/phpstan": "^2.0",
"phpstan/phpstan-strict-rules": "^2.0",
"phpunit/phpunit": "^11.5.13",
diff --git a/src/agent/tests/Fixtures/Tool/youtube-captions.json b/src/agent/tests/Fixtures/Tool/youtube-captions.json
new file mode 100644
index 000000000..f81de66c9
--- /dev/null
+++ b/src/agent/tests/Fixtures/Tool/youtube-captions.json
@@ -0,0 +1,35 @@
+{
+ "playabilityStatus": {
+ "status": "OK"
+ },
+ "captions": {
+ "playerCaptionsTracklistRenderer": {
+ "captionTracks": [
+ {
+ "baseUrl": "https://www.youtube.com/api/timedtext?v=dQw4w9WgXcQ",
+ "name": {
+ "runs": [
+ {
+ "text": "English"
+ }
+ ]
+ },
+ "languageCode": "en",
+ "isTranslatable": true
+ }
+ ],
+ "translationLanguages": [
+ {
+ "languageName": {
+ "runs": [
+ {
+ "text": "Spanish"
+ }
+ ]
+ },
+ "languageCode": "es"
+ }
+ ]
+ }
+ }
+}
diff --git a/src/agent/tests/Fixtures/Tool/youtube-transcript.xml b/src/agent/tests/Fixtures/Tool/youtube-transcript.xml
new file mode 100644
index 000000000..f3048d434
--- /dev/null
+++ b/src/agent/tests/Fixtures/Tool/youtube-transcript.xml
@@ -0,0 +1,6 @@
+
+
+ Hello and welcome to this video
+ Today we will learn about PHP
+ Thank you for watching
+
diff --git a/src/agent/tests/Fixtures/Tool/youtube-video-page.html b/src/agent/tests/Fixtures/Tool/youtube-video-page.html
new file mode 100644
index 000000000..7474944c6
--- /dev/null
+++ b/src/agent/tests/Fixtures/Tool/youtube-video-page.html
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+
+
diff --git a/src/agent/tests/Toolbox/Tool/YouTubeTranscriberTest.php b/src/agent/tests/Toolbox/Tool/YouTubeTranscriberTest.php
new file mode 100644
index 000000000..95201cd32
--- /dev/null
+++ b/src/agent/tests/Toolbox/Tool/YouTubeTranscriberTest.php
@@ -0,0 +1,37 @@
+
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Agent\Tests\Toolbox\Tool;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\Toolbox\Tool\YouTubeTranscriber;
+use Symfony\Component\HttpClient\MockHttpClient;
+use Symfony\Component\HttpClient\Response\MockResponse;
+
+final class YouTubeTranscriberTest extends TestCase
+{
+ public function testInvoke()
+ {
+ $httpClient = new MockHttpClient([
+ MockResponse::fromFile(__DIR__.'/../../Fixtures/Tool/youtube-video-page.html'),
+ MockResponse::fromFile(__DIR__.'/../../Fixtures/Tool/youtube-captions.json'),
+ MockResponse::fromFile(__DIR__.'/../../Fixtures/Tool/youtube-transcript.xml'),
+ ]);
+
+ $transcriber = new YouTubeTranscriber($httpClient);
+
+ $result = $transcriber('dQw4w9WgXcQ');
+
+ $this->assertStringContainsString('Hello and welcome to this video', $result);
+ $this->assertStringContainsString('Today we will learn about PHP', $result);
+ $this->assertStringContainsString('Thank you for watching', $result);
+ }
+}