diff --git a/deptrac.yaml b/deptrac.yaml
index 06066ec95..4709f27b5 100644
--- a/deptrac.yaml
+++ b/deptrac.yaml
@@ -5,6 +5,10 @@ deptrac:
     - '#.*test.*#i'
     - '#.*vendor.*#'
   layers:
+    - name: Fixtures
+      collectors:
+        - type: classLike
+          value: ^Symfony\\AI\\Fixtures\\.*
     - name: AgentComponent
       collectors:
         - type: classLike
@@ -286,6 +290,7 @@ deptrac:
         - type: classLike
           value: Symfony\\AI\\Store\\Bridge\\Weaviate\\.*
   ruleset:
+    Fixtures: ~
     AgentComponent:
       - PlatformComponent
       - StoreComponent
diff --git a/docs/components/platform.rst b/docs/components/platform.rst
index eff1eaf5e..33998b11e 100644
--- a/docs/components/platform.rst
+++ b/docs/components/platform.rst
@@ -356,11 +356,11 @@ the result back to PHP objects.
 
 To achieve this, the ``Symfony\AI\Platform\StructuredOutput\PlatformSubscriber`` needs to be registered with the platform::
 
-    use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
     use Symfony\AI\Platform\Bridge\Mistral\PlatformFactory;
     use Symfony\AI\Platform\Message\Message;
     use Symfony\AI\Platform\Message\MessageBag;
     use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+    use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
     use Symfony\Component\EventDispatcher\EventDispatcher;
 
     $dispatcher = new EventDispatcher();
diff --git a/examples/anthropic/structured-output-math.php b/examples/anthropic/structured-output-math.php
index 66f56fbba..d12dfa849 100644
--- a/examples/anthropic/structured-output-math.php
+++ b/examples/anthropic/structured-output-math.php
@@ -9,11 +9,11 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\AI\Platform\Bridge\Anthropic\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
 require_once dirname(__DIR__).'/bootstrap.php';
diff --git a/examples/composer.json b/examples/composer.json
index 6d20fbb40..c7fa7a63b 100644
--- a/examples/composer.json
+++ b/examples/composer.json
@@ -83,7 +83,8 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Symfony\\AI\\PHPStan\\": "../.phpstan/"
+            "Symfony\\AI\\PHPStan\\": "../.phpstan/",
+            "Symfony\\AI\\Platform\\Tests\\": "../src/platform/tests/"
         }
     },
     "config": {
diff --git a/examples/gemini/structured-output-math.php b/examples/gemini/structured-output-math.php
index 409cf1c1f..3aff25610 100644
--- a/examples/gemini/structured-output-math.php
+++ b/examples/gemini/structured-output-math.php
@@ -9,11 +9,11 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\AI\Platform\Bridge\Gemini\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
 require_once dirname(__DIR__).'/bootstrap.php';
diff --git a/examples/mistral/structured-output-math.php b/examples/mistral/structured-output-math.php
index df7d7596e..ee73fd707 100644
--- a/examples/mistral/structured-output-math.php
+++ b/examples/mistral/structured-output-math.php
@@ -9,11 +9,11 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\AI\Platform\Bridge\Mistral\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
 require_once dirname(__DIR__).'/bootstrap.php';
diff --git a/examples/ollama/structured-output-math.php b/examples/ollama/structured-output-math.php
index 74eb51c87..4e6b57e80 100644
--- a/examples/ollama/structured-output-math.php
+++ b/examples/ollama/structured-output-math.php
@@ -9,11 +9,11 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\AI\Platform\Bridge\Ollama\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
 require_once dirname(__DIR__).'/bootstrap.php';
diff --git a/examples/openai/structured-output-list-of-polymorphic-items.php b/examples/openai/structured-output-list-of-polymorphic-items.php
index a73dc1abe..49dad7669 100644
--- a/examples/openai/structured-output-list-of-polymorphic-items.php
+++ b/examples/openai/structured-output-list-of-polymorphic-items.php
@@ -9,11 +9,11 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\AI\Fixtures\StructuredOutput\PolymorphicType\ListOfPolymorphicTypesDto;
 use Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\PolymorphicType\ListOfPolymorphicTypesDto;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
 require_once dirname(__DIR__).'/bootstrap.php';
diff --git a/examples/openai/structured-output-math.php b/examples/openai/structured-output-math.php
index 008899d1d..429b4ab83 100644
--- a/examples/openai/structured-output-math.php
+++ b/examples/openai/structured-output-math.php
@@ -9,11 +9,11 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
 require_once dirname(__DIR__).'/bootstrap.php';
diff --git a/examples/openai/structured-output-union-types.php b/examples/openai/structured-output-union-types.php
index 168c7591f..a9d98dffb 100644
--- a/examples/openai/structured-output-union-types.php
+++ b/examples/openai/structured-output-union-types.php
@@ -9,11 +9,11 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\AI\Fixtures\StructuredOutput\UnionType\UnionTypeDto;
 use Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UnionType\UnionTypeDto;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
 require_once dirname(__DIR__).'/bootstrap.php';
diff --git a/examples/scaleway/structured-output-math.php b/examples/scaleway/structured-output-math.php
index a0a39f01d..a4083c6f9 100644
--- a/examples/scaleway/structured-output-math.php
+++ b/examples/scaleway/structured-output-math.php
@@ -9,11 +9,11 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\AI\Platform\Bridge\Scaleway\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
 require_once dirname(__DIR__).'/bootstrap.php';
diff --git a/examples/vertexai/structured-output-math.php b/examples/vertexai/structured-output-math.php
index 16d9b748f..068d915f0 100644
--- a/examples/vertexai/structured-output-math.php
+++ b/examples/vertexai/structured-output-math.php
@@ -9,11 +9,11 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\AI\Platform\Bridge\VertexAi\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
 require_once __DIR__.'/bootstrap.php';
diff --git a/src/agent/composer.json b/src/agent/composer.json
index bf49d937d..0c9220a83 100644
--- a/src/agent/composer.json
+++ b/src/agent/composer.json
@@ -40,6 +40,7 @@
         "phpstan/phpstan": "^2.1",
         "phpstan/phpstan-strict-rules": "^2.0",
         "phpunit/phpunit": "^11.5.46",
+        "symfony/ai-platform": "@dev",
         "symfony/ai-store": "@dev",
         "symfony/event-dispatcher": "^7.3|^8.0",
         "symfony/translation": "^7.3|^8.0",
@@ -55,7 +56,8 @@
         "psr-4": {
             "Symfony\\AI\\Agent\\Tests\\": "tests/",
             "Symfony\\AI\\Fixtures\\": "../../fixtures",
-            "Symfony\\AI\\PHPStan\\": "../../.phpstan/"
+            "Symfony\\AI\\PHPStan\\": "../../.phpstan/",
+            "Symfony\\AI\\Platform\\Tests\\": "../platform/tests/"
         }
     },
     "config": {
diff --git a/fixtures/Tool/EnumMode.php b/src/agent/tests/Fixtures/Tool/EnumMode.php
similarity index 87%
rename from fixtures/Tool/EnumMode.php
rename to src/agent/tests/Fixtures/Tool/EnumMode.php
index 117fe13d3..01989c5f7 100644
--- a/fixtures/Tool/EnumMode.php
+++ b/src/agent/tests/Fixtures/Tool/EnumMode.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 enum EnumMode: string
 {
diff --git a/fixtures/Tool/EnumPriority.php b/src/agent/tests/Fixtures/Tool/EnumPriority.php
similarity index 87%
rename from fixtures/Tool/EnumPriority.php
rename to src/agent/tests/Fixtures/Tool/EnumPriority.php
index 50206d7f1..f0040a989 100644
--- a/fixtures/Tool/EnumPriority.php
+++ b/src/agent/tests/Fixtures/Tool/EnumPriority.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 enum EnumPriority: int
 {
diff --git a/fixtures/Tool/ToolArray.php b/src/agent/tests/Fixtures/Tool/ToolArray.php
similarity index 91%
rename from fixtures/Tool/ToolArray.php
rename to src/agent/tests/Fixtures/Tool/ToolArray.php
index ae5f17787..d6fd77030 100644
--- a/fixtures/Tool/ToolArray.php
+++ b/src/agent/tests/Fixtures/Tool/ToolArray.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 
diff --git a/fixtures/Tool/ToolArrayMultidimensional.php b/src/agent/tests/Fixtures/Tool/ToolArrayMultidimensional.php
similarity index 85%
rename from fixtures/Tool/ToolArrayMultidimensional.php
rename to src/agent/tests/Fixtures/Tool/ToolArrayMultidimensional.php
index f9531e804..41f103c0d 100644
--- a/fixtures/Tool/ToolArrayMultidimensional.php
+++ b/src/agent/tests/Fixtures/Tool/ToolArrayMultidimensional.php
@@ -9,10 +9,10 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
-use Symfony\AI\Fixtures\SomeStructure;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\SomeStructure;
 
 #[AsTool('tool_array_multidimensional', 'A tool with multidimensional array parameters')]
 final class ToolArrayMultidimensional
diff --git a/fixtures/Tool/ToolCustomException.php b/src/agent/tests/Fixtures/Tool/ToolCustomException.php
similarity index 95%
rename from fixtures/Tool/ToolCustomException.php
rename to src/agent/tests/Fixtures/Tool/ToolCustomException.php
index d8b39b1f4..d3ec0eba8 100644
--- a/fixtures/Tool/ToolCustomException.php
+++ b/src/agent/tests/Fixtures/Tool/ToolCustomException.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 use Symfony\AI\Agent\Toolbox\Exception\ToolExecutionExceptionInterface;
diff --git a/fixtures/Tool/ToolDate.php b/src/agent/tests/Fixtures/Tool/ToolDate.php
similarity index 92%
rename from fixtures/Tool/ToolDate.php
rename to src/agent/tests/Fixtures/Tool/ToolDate.php
index 255aa7cce..d82bf1e9e 100644
--- a/fixtures/Tool/ToolDate.php
+++ b/src/agent/tests/Fixtures/Tool/ToolDate.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 
diff --git a/fixtures/Tool/ToolException.php b/src/agent/tests/Fixtures/Tool/ToolException.php
similarity index 91%
rename from fixtures/Tool/ToolException.php
rename to src/agent/tests/Fixtures/Tool/ToolException.php
index f53aef7bc..06f52ba4d 100644
--- a/fixtures/Tool/ToolException.php
+++ b/src/agent/tests/Fixtures/Tool/ToolException.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 
diff --git a/fixtures/Tool/ToolMisconfigured.php b/src/agent/tests/Fixtures/Tool/ToolMisconfigured.php
similarity index 91%
rename from fixtures/Tool/ToolMisconfigured.php
rename to src/agent/tests/Fixtures/Tool/ToolMisconfigured.php
index 25abd67ac..772f29bac 100644
--- a/fixtures/Tool/ToolMisconfigured.php
+++ b/src/agent/tests/Fixtures/Tool/ToolMisconfigured.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 
diff --git a/fixtures/Tool/ToolMultiple.php b/src/agent/tests/Fixtures/Tool/ToolMultiple.php
similarity index 94%
rename from fixtures/Tool/ToolMultiple.php
rename to src/agent/tests/Fixtures/Tool/ToolMultiple.php
index 861b33ba2..fedbe7a2b 100644
--- a/fixtures/Tool/ToolMultiple.php
+++ b/src/agent/tests/Fixtures/Tool/ToolMultiple.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 
diff --git a/fixtures/Tool/ToolNoAttribute1.php b/src/agent/tests/Fixtures/Tool/ToolNoAttribute1.php
similarity index 91%
rename from fixtures/Tool/ToolNoAttribute1.php
rename to src/agent/tests/Fixtures/Tool/ToolNoAttribute1.php
index c3fbc64a6..0f85d27f9 100644
--- a/fixtures/Tool/ToolNoAttribute1.php
+++ b/src/agent/tests/Fixtures/Tool/ToolNoAttribute1.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 final class ToolNoAttribute1
 {
diff --git a/fixtures/Tool/ToolNoAttribute2.php b/src/agent/tests/Fixtures/Tool/ToolNoAttribute2.php
similarity index 93%
rename from fixtures/Tool/ToolNoAttribute2.php
rename to src/agent/tests/Fixtures/Tool/ToolNoAttribute2.php
index 28345652d..8df903b1e 100644
--- a/fixtures/Tool/ToolNoAttribute2.php
+++ b/src/agent/tests/Fixtures/Tool/ToolNoAttribute2.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 final class ToolNoAttribute2
 {
diff --git a/fixtures/Tool/ToolNoParams.php b/src/agent/tests/Fixtures/Tool/ToolNoParams.php
similarity index 90%
rename from fixtures/Tool/ToolNoParams.php
rename to src/agent/tests/Fixtures/Tool/ToolNoParams.php
index 1d7e2586d..f60157925 100644
--- a/fixtures/Tool/ToolNoParams.php
+++ b/src/agent/tests/Fixtures/Tool/ToolNoParams.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 
diff --git a/fixtures/Tool/ToolOptionalParam.php b/src/agent/tests/Fixtures/Tool/ToolOptionalParam.php
similarity index 93%
rename from fixtures/Tool/ToolOptionalParam.php
rename to src/agent/tests/Fixtures/Tool/ToolOptionalParam.php
index 281c5f4e0..e5455beb9 100644
--- a/fixtures/Tool/ToolOptionalParam.php
+++ b/src/agent/tests/Fixtures/Tool/ToolOptionalParam.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 
diff --git a/fixtures/Tool/ToolRequiredParams.php b/src/agent/tests/Fixtures/Tool/ToolRequiredParams.php
similarity index 93%
rename from fixtures/Tool/ToolRequiredParams.php
rename to src/agent/tests/Fixtures/Tool/ToolRequiredParams.php
index 3b56204fb..48186de3e 100644
--- a/fixtures/Tool/ToolRequiredParams.php
+++ b/src/agent/tests/Fixtures/Tool/ToolRequiredParams.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 
diff --git a/fixtures/Tool/ToolSources.php b/src/agent/tests/Fixtures/Tool/ToolSources.php
similarity index 95%
rename from fixtures/Tool/ToolSources.php
rename to src/agent/tests/Fixtures/Tool/ToolSources.php
index e225f4906..bb5a69681 100644
--- a/fixtures/Tool/ToolSources.php
+++ b/src/agent/tests/Fixtures/Tool/ToolSources.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 use Symfony\AI\Agent\Toolbox\Source\HasSourcesInterface;
diff --git a/fixtures/Tool/ToolWithBackedEnums.php b/src/agent/tests/Fixtures/Tool/ToolWithBackedEnums.php
similarity index 95%
rename from fixtures/Tool/ToolWithBackedEnums.php
rename to src/agent/tests/Fixtures/Tool/ToolWithBackedEnums.php
index 0f62cf2f0..30d6c9f87 100644
--- a/fixtures/Tool/ToolWithBackedEnums.php
+++ b/src/agent/tests/Fixtures/Tool/ToolWithBackedEnums.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 class ToolWithBackedEnums
 {
diff --git a/fixtures/Tool/ToolWithToolParameterAttribute.php b/src/agent/tests/Fixtures/Tool/ToolWithToolParameterAttribute.php
similarity index 97%
rename from fixtures/Tool/ToolWithToolParameterAttribute.php
rename to src/agent/tests/Fixtures/Tool/ToolWithToolParameterAttribute.php
index 2463229b7..8df36f306 100644
--- a/fixtures/Tool/ToolWithToolParameterAttribute.php
+++ b/src/agent/tests/Fixtures/Tool/ToolWithToolParameterAttribute.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 use Symfony\AI\Platform\Contract\JsonSchema\Attribute\With;
diff --git a/fixtures/Tool/ToolWithoutDocs.php b/src/agent/tests/Fixtures/Tool/ToolWithoutDocs.php
similarity index 91%
rename from fixtures/Tool/ToolWithoutDocs.php
rename to src/agent/tests/Fixtures/Tool/ToolWithoutDocs.php
index 29a172558..137318c1c 100644
--- a/fixtures/Tool/ToolWithoutDocs.php
+++ b/src/agent/tests/Fixtures/Tool/ToolWithoutDocs.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 
diff --git a/fixtures/Tool/ToolWrong.php b/src/agent/tests/Fixtures/Tool/ToolWrong.php
similarity index 91%
rename from fixtures/Tool/ToolWrong.php
rename to src/agent/tests/Fixtures/Tool/ToolWrong.php
index 7297b4f13..25b794a51 100644
--- a/fixtures/Tool/ToolWrong.php
+++ b/src/agent/tests/Fixtures/Tool/ToolWrong.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\Tool;
+namespace Symfony\AI\Agent\Tests\Fixtures\Tool;
 
 final class ToolWrong
 {
diff --git a/src/agent/tests/InputProcessor/SystemPromptInputProcessorTest.php b/src/agent/tests/InputProcessor/SystemPromptInputProcessorTest.php
index 1e628d10a..e411900e0 100644
--- a/src/agent/tests/InputProcessor/SystemPromptInputProcessorTest.php
+++ b/src/agent/tests/InputProcessor/SystemPromptInputProcessorTest.php
@@ -14,10 +14,10 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\AI\Agent\Input;
 use Symfony\AI\Agent\InputProcessor\SystemPromptInputProcessor;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
 use Symfony\AI\Agent\Toolbox\ToolboxInterface;
 use Symfony\AI\Agent\Toolbox\ToolResult;
-use Symfony\AI\Fixtures\Tool\ToolNoParams;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
 use Symfony\AI\Platform\Message\Content\File;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
diff --git a/src/agent/tests/Toolbox/FaultTolerantToolboxTest.php b/src/agent/tests/Toolbox/FaultTolerantToolboxTest.php
index cd1355327..6b8a18dd7 100644
--- a/src/agent/tests/Toolbox/FaultTolerantToolboxTest.php
+++ b/src/agent/tests/Toolbox/FaultTolerantToolboxTest.php
@@ -12,14 +12,14 @@
 namespace Symfony\AI\Agent\Tests\Toolbox;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
 use Symfony\AI\Agent\Toolbox\Exception\ToolExecutionException;
 use Symfony\AI\Agent\Toolbox\Exception\ToolExecutionExceptionInterface;
 use Symfony\AI\Agent\Toolbox\Exception\ToolNotFoundException;
 use Symfony\AI\Agent\Toolbox\FaultTolerantToolbox;
 use Symfony\AI\Agent\Toolbox\ToolboxInterface;
 use Symfony\AI\Agent\Toolbox\ToolResult;
-use Symfony\AI\Fixtures\Tool\ToolNoParams;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
 use Symfony\AI\Platform\Result\ToolCall;
 use Symfony\AI\Platform\Tool\ExecutionReference;
 use Symfony\AI\Platform\Tool\Tool;
diff --git a/src/agent/tests/Toolbox/MetadataFactory/ChainFactoryTest.php b/src/agent/tests/Toolbox/MetadataFactory/ChainFactoryTest.php
index bcbde2fac..1b3413977 100644
--- a/src/agent/tests/Toolbox/MetadataFactory/ChainFactoryTest.php
+++ b/src/agent/tests/Toolbox/MetadataFactory/ChainFactoryTest.php
@@ -12,16 +12,16 @@
 namespace Symfony\AI\Agent\Tests\Toolbox\MetadataFactory;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolMisconfigured;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolMultiple;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoAttribute1;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolOptionalParam;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
 use Symfony\AI\Agent\Toolbox\Exception\ToolConfigurationException;
 use Symfony\AI\Agent\Toolbox\Exception\ToolException;
 use Symfony\AI\Agent\Toolbox\ToolFactory\ChainFactory;
 use Symfony\AI\Agent\Toolbox\ToolFactory\MemoryToolFactory;
 use Symfony\AI\Agent\Toolbox\ToolFactory\ReflectionToolFactory;
-use Symfony\AI\Fixtures\Tool\ToolMisconfigured;
-use Symfony\AI\Fixtures\Tool\ToolMultiple;
-use Symfony\AI\Fixtures\Tool\ToolNoAttribute1;
-use Symfony\AI\Fixtures\Tool\ToolOptionalParam;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
 
 final class ChainFactoryTest extends TestCase
 {
diff --git a/src/agent/tests/Toolbox/MetadataFactory/MemoryFactoryTest.php b/src/agent/tests/Toolbox/MetadataFactory/MemoryFactoryTest.php
index 0a92f0182..70a5b30af 100644
--- a/src/agent/tests/Toolbox/MetadataFactory/MemoryFactoryTest.php
+++ b/src/agent/tests/Toolbox/MetadataFactory/MemoryFactoryTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\AI\Agent\Tests\Toolbox\MetadataFactory;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoAttribute1;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoAttribute2;
 use Symfony\AI\Agent\Toolbox\Exception\ToolException;
 use Symfony\AI\Agent\Toolbox\ToolFactory\MemoryToolFactory;
-use Symfony\AI\Fixtures\Tool\ToolNoAttribute1;
-use Symfony\AI\Fixtures\Tool\ToolNoAttribute2;
 use Symfony\AI\Platform\Tool\Tool;
 
 final class MemoryFactoryTest extends TestCase
diff --git a/src/agent/tests/Toolbox/MetadataFactory/ReflectionFactoryTest.php b/src/agent/tests/Toolbox/MetadataFactory/ReflectionFactoryTest.php
index 589f06fca..da13491cd 100644
--- a/src/agent/tests/Toolbox/MetadataFactory/ReflectionFactoryTest.php
+++ b/src/agent/tests/Toolbox/MetadataFactory/ReflectionFactoryTest.php
@@ -12,12 +12,12 @@
 namespace Symfony\AI\Agent\Tests\Toolbox\MetadataFactory;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolMultiple;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolWrong;
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 use Symfony\AI\Agent\Toolbox\Exception\ToolException;
 use Symfony\AI\Agent\Toolbox\ToolFactory\ReflectionToolFactory;
-use Symfony\AI\Fixtures\Tool\ToolMultiple;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
-use Symfony\AI\Fixtures\Tool\ToolWrong;
 use Symfony\AI\Platform\Tool\Tool;
 
 final class ReflectionFactoryTest extends TestCase
diff --git a/src/agent/tests/Toolbox/ToolCallArgumentResolverTest.php b/src/agent/tests/Toolbox/ToolCallArgumentResolverTest.php
index 818657355..da2cd57d4 100644
--- a/src/agent/tests/Toolbox/ToolCallArgumentResolverTest.php
+++ b/src/agent/tests/Toolbox/ToolCallArgumentResolverTest.php
@@ -12,13 +12,13 @@
 namespace Symfony\AI\Agent\Tests\Toolbox;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolArray;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolArrayMultidimensional;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolDate;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoParams;
 use Symfony\AI\Agent\Toolbox\ToolCallArgumentResolver;
-use Symfony\AI\Fixtures\SomeStructure;
-use Symfony\AI\Fixtures\Tool\ToolArray;
-use Symfony\AI\Fixtures\Tool\ToolArrayMultidimensional;
-use Symfony\AI\Fixtures\Tool\ToolDate;
-use Symfony\AI\Fixtures\Tool\ToolNoParams;
 use Symfony\AI\Platform\Result\ToolCall;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\SomeStructure;
 use Symfony\AI\Platform\Tool\ExecutionReference;
 use Symfony\AI\Platform\Tool\Tool;
 
diff --git a/src/agent/tests/Toolbox/ToolResultConverterTest.php b/src/agent/tests/Toolbox/ToolResultConverterTest.php
index fa8615b53..1e4fee7c0 100644
--- a/src/agent/tests/Toolbox/ToolResultConverterTest.php
+++ b/src/agent/tests/Toolbox/ToolResultConverterTest.php
@@ -15,8 +15,8 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\AI\Agent\Toolbox\ToolResult;
 use Symfony\AI\Agent\Toolbox\ToolResultConverter;
-use Symfony\AI\Fixtures\StructuredOutput\UserWithConstructor;
 use Symfony\AI\Platform\Result\ToolCall;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UserWithConstructor;
 
 final class ToolResultConverterTest extends TestCase
 {
diff --git a/src/agent/tests/Toolbox/ToolboxEventDispatcherTest.php b/src/agent/tests/Toolbox/ToolboxEventDispatcherTest.php
index 903d9fbe9..8283fda38 100644
--- a/src/agent/tests/Toolbox/ToolboxEventDispatcherTest.php
+++ b/src/agent/tests/Toolbox/ToolboxEventDispatcherTest.php
@@ -13,13 +13,13 @@
 
 use PHPUnit\Framework\MockObject\Exception;
 use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolCustomException;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolException;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoParams;
 use Symfony\AI\Agent\Toolbox\Event\ToolCallArgumentsResolved;
 use Symfony\AI\Agent\Toolbox\Event\ToolCallFailed;
 use Symfony\AI\Agent\Toolbox\Event\ToolCallSucceeded;
 use Symfony\AI\Agent\Toolbox\Toolbox;
-use Symfony\AI\Fixtures\Tool\ToolCustomException;
-use Symfony\AI\Fixtures\Tool\ToolException;
-use Symfony\AI\Fixtures\Tool\ToolNoParams;
 use Symfony\AI\Platform\Result\ToolCall;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
diff --git a/src/agent/tests/Toolbox/ToolboxTest.php b/src/agent/tests/Toolbox/ToolboxTest.php
index ecb0a16b1..ad81e589b 100644
--- a/src/agent/tests/Toolbox/ToolboxTest.php
+++ b/src/agent/tests/Toolbox/ToolboxTest.php
@@ -13,6 +13,15 @@
 
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolCustomException;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolDate;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolException;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolMisconfigured;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoAttribute1;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolOptionalParam;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolSources;
 use Symfony\AI\Agent\Toolbox\Exception\ToolConfigurationException;
 use Symfony\AI\Agent\Toolbox\Exception\ToolExecutionException;
 use Symfony\AI\Agent\Toolbox\Exception\ToolExecutionExceptionInterface;
@@ -23,15 +32,6 @@
 use Symfony\AI\Agent\Toolbox\ToolFactory\MemoryToolFactory;
 use Symfony\AI\Agent\Toolbox\ToolFactory\ReflectionToolFactory;
 use Symfony\AI\Agent\Toolbox\ToolResult;
-use Symfony\AI\Fixtures\Tool\ToolCustomException;
-use Symfony\AI\Fixtures\Tool\ToolDate;
-use Symfony\AI\Fixtures\Tool\ToolException;
-use Symfony\AI\Fixtures\Tool\ToolMisconfigured;
-use Symfony\AI\Fixtures\Tool\ToolNoAttribute1;
-use Symfony\AI\Fixtures\Tool\ToolNoParams;
-use Symfony\AI\Fixtures\Tool\ToolOptionalParam;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
-use Symfony\AI\Fixtures\Tool\ToolSources;
 use Symfony\AI\Platform\Result\ToolCall;
 use Symfony\AI\Platform\Tool\ExecutionReference;
 use Symfony\AI\Platform\Tool\Tool;
diff --git a/src/platform/composer.json b/src/platform/composer.json
index 3418cbed5..9c9bfb89e 100644
--- a/src/platform/composer.json
+++ b/src/platform/composer.json
@@ -63,6 +63,7 @@
     },
     "require-dev": {
         "async-aws/bedrock-runtime": "^0.1|^1.0",
+        "symfony/ai-agent": "@dev",
         "codewithkyrian/transformers": "^0.6.2",
         "google/auth": "^1.47",
         "phpstan/phpstan": "^2.1.17",
@@ -85,6 +86,7 @@
     },
     "autoload-dev": {
         "psr-4": {
+            "Symfony\\AI\\Agent\\Tests\\": "../agent/tests/",
             "Symfony\\AI\\Fixtures\\": "../../fixtures",
             "Symfony\\AI\\PHPStan\\": "../../.phpstan/",
             "Symfony\\AI\\Platform\\Tests\\": "tests/"
diff --git a/src/platform/tests/Bridge/Gemini/Contract/ToolNormalizerTest.php b/src/platform/tests/Bridge/Gemini/Contract/ToolNormalizerTest.php
index e59e84ead..45dda8a0d 100644
--- a/src/platform/tests/Bridge/Gemini/Contract/ToolNormalizerTest.php
+++ b/src/platform/tests/Bridge/Gemini/Contract/ToolNormalizerTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use Symfony\AI\Fixtures\Tool\ToolNoParams;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
 use Symfony\AI\Platform\Bridge\Gemini\Contract\ToolNormalizer;
 use Symfony\AI\Platform\Bridge\Gemini\Gemini;
 use Symfony\AI\Platform\Contract;
diff --git a/src/platform/tests/Bridge/VertexAi/Contract/ToolNormalizerTest.php b/src/platform/tests/Bridge/VertexAi/Contract/ToolNormalizerTest.php
index 53b819a7f..70e405420 100644
--- a/src/platform/tests/Bridge/VertexAi/Contract/ToolNormalizerTest.php
+++ b/src/platform/tests/Bridge/VertexAi/Contract/ToolNormalizerTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use Symfony\AI\Fixtures\Tool\ToolNoParams;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
 use Symfony\AI\Platform\Bridge\VertexAi\Contract\ToolNormalizer;
 use Symfony\AI\Platform\Bridge\VertexAi\Gemini\Model;
 use Symfony\AI\Platform\Contract;
diff --git a/src/platform/tests/Contract/JsonSchema/DescriptionParserTest.php b/src/platform/tests/Contract/JsonSchema/DescriptionParserTest.php
index 90d09993f..85c597150 100644
--- a/src/platform/tests/Contract/JsonSchema/DescriptionParserTest.php
+++ b/src/platform/tests/Contract/JsonSchema/DescriptionParserTest.php
@@ -13,11 +13,11 @@
 
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use Symfony\AI\Fixtures\StructuredOutput\User;
-use Symfony\AI\Fixtures\StructuredOutput\UserWithConstructor;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
-use Symfony\AI\Fixtures\Tool\ToolWithoutDocs;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolWithoutDocs;
 use Symfony\AI\Platform\Contract\JsonSchema\DescriptionParser;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\User;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UserWithConstructor;
 
 final class DescriptionParserTest extends TestCase
 {
diff --git a/src/platform/tests/Contract/JsonSchema/FactoryTest.php b/src/platform/tests/Contract/JsonSchema/FactoryTest.php
index f034870f4..27ff155d3 100644
--- a/src/platform/tests/Contract/JsonSchema/FactoryTest.php
+++ b/src/platform/tests/Contract/JsonSchema/FactoryTest.php
@@ -12,18 +12,18 @@
 namespace Symfony\AI\Platform\Tests\Contract\JsonSchema;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\AI\Fixtures\StructuredOutput\ExampleDto;
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
-use Symfony\AI\Fixtures\StructuredOutput\PolymorphicType\ListOfPolymorphicTypesDto;
-use Symfony\AI\Fixtures\StructuredOutput\Step;
-use Symfony\AI\Fixtures\StructuredOutput\UnionType\UnionTypeDto;
-use Symfony\AI\Fixtures\StructuredOutput\User;
-use Symfony\AI\Fixtures\Tool\ToolNoParams;
-use Symfony\AI\Fixtures\Tool\ToolOptionalParam;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
-use Symfony\AI\Fixtures\Tool\ToolWithBackedEnums;
-use Symfony\AI\Fixtures\Tool\ToolWithToolParameterAttribute;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolOptionalParam;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolWithBackedEnums;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolWithToolParameterAttribute;
 use Symfony\AI\Platform\Contract\JsonSchema\Factory;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\ExampleDto;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\PolymorphicType\ListOfPolymorphicTypesDto;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\Step;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UnionType\UnionTypeDto;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\User;
 
 final class FactoryTest extends TestCase
 {
diff --git a/src/platform/tests/Contract/Normalizer/ToolNormalizerTest.php b/src/platform/tests/Contract/Normalizer/ToolNormalizerTest.php
index 7dc028f6f..7921655da 100644
--- a/src/platform/tests/Contract/Normalizer/ToolNormalizerTest.php
+++ b/src/platform/tests/Contract/Normalizer/ToolNormalizerTest.php
@@ -13,10 +13,10 @@
 
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use Symfony\AI\Fixtures\Tool\ToolException;
-use Symfony\AI\Fixtures\Tool\ToolNoParams;
-use Symfony\AI\Fixtures\Tool\ToolOptionalParam;
-use Symfony\AI\Fixtures\Tool\ToolRequiredParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolException;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolNoParams;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolOptionalParam;
+use Symfony\AI\Agent\Tests\Fixtures\Tool\ToolRequiredParams;
 use Symfony\AI\Platform\Contract\Normalizer\ToolNormalizer;
 use Symfony\AI\Platform\Tool\ExecutionReference;
 use Symfony\AI\Platform\Tool\Tool;
diff --git a/fixtures/StructuredOutput/ExampleDto.php b/src/platform/tests/Fixtures/StructuredOutput/ExampleDto.php
similarity index 89%
rename from fixtures/StructuredOutput/ExampleDto.php
rename to src/platform/tests/Fixtures/StructuredOutput/ExampleDto.php
index 2d2ec6844..bb9990197 100644
--- a/fixtures/StructuredOutput/ExampleDto.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/ExampleDto.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput;
 
 use Symfony\AI\Platform\Contract\JsonSchema\Attribute\With;
 
diff --git a/fixtures/StructuredOutput/MathReasoning.php b/src/platform/tests/Fixtures/StructuredOutput/MathReasoning.php
similarity index 87%
rename from fixtures/StructuredOutput/MathReasoning.php
rename to src/platform/tests/Fixtures/StructuredOutput/MathReasoning.php
index b56fe9daa..340774dce 100644
--- a/fixtures/StructuredOutput/MathReasoning.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/MathReasoning.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput;
 
 final class MathReasoning
 {
diff --git a/fixtures/StructuredOutput/MathReasoningWithAttributes.php b/src/platform/tests/Fixtures/StructuredOutput/MathReasoningWithAttributes.php
similarity index 90%
rename from fixtures/StructuredOutput/MathReasoningWithAttributes.php
rename to src/platform/tests/Fixtures/StructuredOutput/MathReasoningWithAttributes.php
index bd552c7ca..4d34852a1 100644
--- a/fixtures/StructuredOutput/MathReasoningWithAttributes.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/MathReasoningWithAttributes.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput;
 
 use Symfony\Component\Serializer\Attribute\Ignore;
 use Symfony\Component\Serializer\Attribute\SerializedName;
diff --git a/fixtures/StructuredOutput/PolymorphicType/ListItemAge.php b/src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListItemAge.php
similarity index 86%
rename from fixtures/StructuredOutput/PolymorphicType/ListItemAge.php
rename to src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListItemAge.php
index 309157cad..1066ff4ae 100644
--- a/fixtures/StructuredOutput/PolymorphicType/ListItemAge.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListItemAge.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput\PolymorphicType;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\PolymorphicType;
 
 use Symfony\AI\Platform\Contract\JsonSchema\Attribute\With;
 
diff --git a/fixtures/StructuredOutput/PolymorphicType/ListItemDiscriminator.php b/src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListItemDiscriminator.php
similarity index 89%
rename from fixtures/StructuredOutput/PolymorphicType/ListItemDiscriminator.php
rename to src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListItemDiscriminator.php
index 4f42e9caa..48b0dfe33 100644
--- a/fixtures/StructuredOutput/PolymorphicType/ListItemDiscriminator.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListItemDiscriminator.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput\PolymorphicType;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\PolymorphicType;
 
 use Symfony\Component\Serializer\Attribute\DiscriminatorMap;
 
diff --git a/fixtures/StructuredOutput/PolymorphicType/ListItemName.php b/src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListItemName.php
similarity index 86%
rename from fixtures/StructuredOutput/PolymorphicType/ListItemName.php
rename to src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListItemName.php
index 4270c7b0c..1df42453f 100644
--- a/fixtures/StructuredOutput/PolymorphicType/ListItemName.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListItemName.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput\PolymorphicType;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\PolymorphicType;
 
 use Symfony\AI\Platform\Contract\JsonSchema\Attribute\With;
 
diff --git a/fixtures/StructuredOutput/PolymorphicType/ListOfPolymorphicTypesDto.php b/src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListOfPolymorphicTypesDto.php
similarity index 88%
rename from fixtures/StructuredOutput/PolymorphicType/ListOfPolymorphicTypesDto.php
rename to src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListOfPolymorphicTypesDto.php
index 59e935cfd..39c2e1610 100644
--- a/fixtures/StructuredOutput/PolymorphicType/ListOfPolymorphicTypesDto.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/PolymorphicType/ListOfPolymorphicTypesDto.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput\PolymorphicType;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\PolymorphicType;
 
 /**
  * Useful when you need to tell an agent that any of the items are acceptable types.
diff --git a/fixtures/SomeStructure.php b/src/platform/tests/Fixtures/StructuredOutput/SomeStructure.php
similarity index 87%
rename from fixtures/SomeStructure.php
rename to src/platform/tests/Fixtures/StructuredOutput/SomeStructure.php
index fc26a141b..48143c99c 100644
--- a/fixtures/SomeStructure.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/SomeStructure.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput;
 
 final class SomeStructure
 {
diff --git a/fixtures/StructuredOutput/Step.php b/src/platform/tests/Fixtures/StructuredOutput/Step.php
similarity index 85%
rename from fixtures/StructuredOutput/Step.php
rename to src/platform/tests/Fixtures/StructuredOutput/Step.php
index 8ef356149..0fb324961 100644
--- a/fixtures/StructuredOutput/Step.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/Step.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput;
 
 final class Step
 {
diff --git a/fixtures/StructuredOutput/UnionType/HumanReadableTimeUnion.php b/src/platform/tests/Fixtures/StructuredOutput/UnionType/HumanReadableTimeUnion.php
similarity index 82%
rename from fixtures/StructuredOutput/UnionType/HumanReadableTimeUnion.php
rename to src/platform/tests/Fixtures/StructuredOutput/UnionType/HumanReadableTimeUnion.php
index 874ae5f54..cfb11ec37 100644
--- a/fixtures/StructuredOutput/UnionType/HumanReadableTimeUnion.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/UnionType/HumanReadableTimeUnion.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput\UnionType;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UnionType;
 
 final class HumanReadableTimeUnion
 {
diff --git a/fixtures/StructuredOutput/UnionType/UnionTypeDto.php b/src/platform/tests/Fixtures/StructuredOutput/UnionType/UnionTypeDto.php
similarity index 84%
rename from fixtures/StructuredOutput/UnionType/UnionTypeDto.php
rename to src/platform/tests/Fixtures/StructuredOutput/UnionType/UnionTypeDto.php
index f626d7087..b7d71c1d9 100644
--- a/fixtures/StructuredOutput/UnionType/UnionTypeDto.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/UnionType/UnionTypeDto.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput\UnionType;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UnionType;
 
 final class UnionTypeDto
 {
diff --git a/fixtures/StructuredOutput/UnionType/UnixTimestampUnion.php b/src/platform/tests/Fixtures/StructuredOutput/UnionType/UnixTimestampUnion.php
similarity index 82%
rename from fixtures/StructuredOutput/UnionType/UnixTimestampUnion.php
rename to src/platform/tests/Fixtures/StructuredOutput/UnionType/UnixTimestampUnion.php
index a67079e47..bf0895a3b 100644
--- a/fixtures/StructuredOutput/UnionType/UnixTimestampUnion.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/UnionType/UnixTimestampUnion.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput\UnionType;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UnionType;
 
 final class UnixTimestampUnion
 {
diff --git a/fixtures/StructuredOutput/User.php b/src/platform/tests/Fixtures/StructuredOutput/User.php
similarity index 88%
rename from fixtures/StructuredOutput/User.php
rename to src/platform/tests/Fixtures/StructuredOutput/User.php
index f006b936c..e25592bd9 100644
--- a/fixtures/StructuredOutput/User.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/User.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput;
 
 final class User
 {
diff --git a/fixtures/StructuredOutput/UserWithConstructor.php b/src/platform/tests/Fixtures/StructuredOutput/UserWithConstructor.php
similarity index 89%
rename from fixtures/StructuredOutput/UserWithConstructor.php
rename to src/platform/tests/Fixtures/StructuredOutput/UserWithConstructor.php
index ceb7fa65d..a0bd3d6f4 100644
--- a/fixtures/StructuredOutput/UserWithConstructor.php
+++ b/src/platform/tests/Fixtures/StructuredOutput/UserWithConstructor.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Fixtures\StructuredOutput;
+namespace Symfony\AI\Platform\Tests\Fixtures\StructuredOutput;
 
 final class UserWithConstructor
 {
diff --git a/src/platform/tests/StructuredOutput/PlatformSubscriberTest.php b/src/platform/tests/StructuredOutput/PlatformSubscriberTest.php
index f26f97ae6..561e04be7 100644
--- a/src/platform/tests/StructuredOutput/PlatformSubscriberTest.php
+++ b/src/platform/tests/StructuredOutput/PlatformSubscriberTest.php
@@ -13,16 +13,6 @@
 
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use Symfony\AI\Fixtures\SomeStructure;
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoning;
-use Symfony\AI\Fixtures\StructuredOutput\MathReasoningWithAttributes;
-use Symfony\AI\Fixtures\StructuredOutput\PolymorphicType\ListItemAge;
-use Symfony\AI\Fixtures\StructuredOutput\PolymorphicType\ListItemName;
-use Symfony\AI\Fixtures\StructuredOutput\PolymorphicType\ListOfPolymorphicTypesDto;
-use Symfony\AI\Fixtures\StructuredOutput\Step;
-use Symfony\AI\Fixtures\StructuredOutput\UnionType\HumanReadableTimeUnion;
-use Symfony\AI\Fixtures\StructuredOutput\UnionType\UnionTypeDto;
-use Symfony\AI\Fixtures\StructuredOutput\UnionType\UnixTimestampUnion;
 use Symfony\AI\Platform\Capability;
 use Symfony\AI\Platform\Event\InvocationEvent;
 use Symfony\AI\Platform\Event\ResultEvent;
@@ -36,6 +26,16 @@
 use Symfony\AI\Platform\Result\TextResult;
 use Symfony\AI\Platform\StructuredOutput\PlatformSubscriber;
 use Symfony\AI\Platform\Test\PlainConverter;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoning;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\MathReasoningWithAttributes;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\PolymorphicType\ListItemAge;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\PolymorphicType\ListItemName;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\PolymorphicType\ListOfPolymorphicTypesDto;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\SomeStructure;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\Step;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UnionType\HumanReadableTimeUnion;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UnionType\UnionTypeDto;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\UnionType\UnixTimestampUnion;
 
 final class PlatformSubscriberTest extends TestCase
 {
diff --git a/src/platform/tests/StructuredOutput/ResponseFormatFactoryTest.php b/src/platform/tests/StructuredOutput/ResponseFormatFactoryTest.php
index 84ad106cd..e9801cc7c 100644
--- a/src/platform/tests/StructuredOutput/ResponseFormatFactoryTest.php
+++ b/src/platform/tests/StructuredOutput/ResponseFormatFactoryTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\AI\Platform\Tests\StructuredOutput;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\AI\Fixtures\StructuredOutput\User;
 use Symfony\AI\Platform\StructuredOutput\ResponseFormatFactory;
+use Symfony\AI\Platform\Tests\Fixtures\StructuredOutput\User;
 
 final class ResponseFormatFactoryTest extends TestCase
 {