diff --git a/src/agent/tests/AgentTest.php b/src/agent/tests/AgentTest.php
index 2358e9379..ba1014f75 100644
--- a/src/agent/tests/AgentTest.php
+++ b/src/agent/tests/AgentTest.php
@@ -104,7 +104,7 @@ public function testConstructorThrowsExceptionForInvalidInputProcessor()
         $invalidProcessor = new \stdClass();
 
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage('Processor "stdClass" must implement "Symfony\AI\Agent\InputProcessorInterface".');
+        $this->expectExceptionMessage('Processor "stdClass" must implement "'.InputProcessorInterface::class.'".');
 
         /* @phpstan-ignore-next-line */
         new Agent($platform, $model, [$invalidProcessor]);
@@ -117,7 +117,7 @@ public function testConstructorThrowsExceptionForInvalidOutputProcessor()
         $invalidProcessor = new \stdClass();
 
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage('Processor "stdClass" must implement "Symfony\AI\Agent\OutputProcessorInterface".');
+        $this->expectExceptionMessage('Processor "stdClass" must implement "'.OutputProcessorInterface::class.'".');
 
         /* @phpstan-ignore-next-line */
         new Agent($platform, $model, [], [$invalidProcessor]);
diff --git a/src/agent/tests/InputProcessor/ModelOverrideInputProcessorTest.php b/src/agent/tests/InputProcessor/ModelOverrideInputProcessorTest.php
index 6696d43ad..a30768cc2 100644
--- a/src/agent/tests/InputProcessor/ModelOverrideInputProcessorTest.php
+++ b/src/agent/tests/InputProcessor/ModelOverrideInputProcessorTest.php
@@ -22,6 +22,7 @@
 use Symfony\AI\Platform\Bridge\OpenAi\Embeddings;
 use Symfony\AI\Platform\Bridge\OpenAi\Gpt;
 use Symfony\AI\Platform\Message\MessageBag;
+use Symfony\AI\Platform\Model;
 
 #[CoversClass(ModelOverrideInputProcessor::class)]
 #[UsesClass(Gpt::class)]
@@ -58,7 +59,7 @@ public function testProcessInputWithoutModelOption()
     public function testProcessInputWithInvalidModelOption()
     {
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage('Option "model" must be an instance of "Symfony\AI\Platform\Model".');
+        $this->expectExceptionMessage('Option "model" must be an instance of "'.Model::class.'".');
 
         $gpt = new Gpt();
         $model = new MessageBag();
diff --git a/src/agent/tests/Toolbox/ToolboxTest.php b/src/agent/tests/Toolbox/ToolboxTest.php
index 67e0b2ba7..62f4cfeea 100644
--- a/src/agent/tests/Toolbox/ToolboxTest.php
+++ b/src/agent/tests/Toolbox/ToolboxTest.php
@@ -162,7 +162,7 @@ public function testExecuteWithUnknownTool()
     public function testExecuteWithMisconfiguredTool()
     {
         $this->expectException(ToolConfigurationException::class);
-        $this->expectExceptionMessage('Method "foo" not found in tool "Symfony\AI\Fixtures\Tool\ToolMisconfigured".');
+        $this->expectExceptionMessage('Method "foo" not found in tool "'.ToolMisconfigured::class.'".');
 
         $toolbox = new Toolbox([new ToolMisconfigured()], new ReflectionToolFactory());