diff --git a/demo/config/packages/ai.yaml b/demo/config/packages/ai.yaml
index 494bb029e..aa356ff62 100644
--- a/demo/config/packages/ai.yaml
+++ b/demo/config/packages/ai.yaml
@@ -68,6 +68,22 @@ ai:
                 - 'Symfony\AI\Store\Document\Transformer\TextTrimTransformer'
             vectorizer: 'ai.vectorizer.openai'
             store: 'ai.store.chroma_db.symfonycon'
+    message_store:
+        cache:
+            audio:
+                service: 'cache.app'
+            wikipedia: ~
+            youtube: ~
+    chat:
+        audio:
+            agent: 'audio'
+            message_store: 'cache.audio'
+        wikipedia:
+            agent: 'wikipedia'
+            message_store: 'cache.wikipedia'
+        youtube:
+            agent: 'youtube'
+            message_store: 'cache.youtube'
 
 services:
     _defaults:
diff --git a/demo/src/Audio/Chat.php b/demo/src/Audio/Chat.php
deleted file mode 100644
index 178dd32fa..000000000
--- a/demo/src/Audio/Chat.php
+++ /dev/null
@@ -1,75 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace App\Audio;
-
-use Symfony\AI\Agent\AgentInterface;
-use Symfony\AI\Platform\Bridge\OpenAi\Whisper;
-use Symfony\AI\Platform\Message\Content\Audio;
-use Symfony\AI\Platform\Message\Message;
-use Symfony\AI\Platform\Message\MessageBag;
-use Symfony\AI\Platform\PlatformInterface;
-use Symfony\AI\Platform\Result\TextResult;
-use Symfony\Component\DependencyInjection\Attribute\Autowire;
-use Symfony\Component\HttpFoundation\RequestStack;
-
-final class Chat
-{
-    private const SESSION_KEY = 'audio-chat';
-
-    public function __construct(
-        private readonly PlatformInterface $platform,
-        private readonly RequestStack $requestStack,
-        #[Autowire(service: 'ai.agent.audio')]
-        private readonly AgentInterface $agent,
-    ) {
-    }
-
-    public function say(string $base64audio): void
-    {
-        // Convert base64 to temporary binary file
-        $path = tempnam(sys_get_temp_dir(), 'audio-').'.wav';
-        file_put_contents($path, base64_decode($base64audio));
-
-        $result = $this->platform->invoke(new Whisper(), Audio::fromFile($path));
-
-        $this->submitMessage($result->asText());
-    }
-
-    public function loadMessages(): MessageBag
-    {
-        return $this->requestStack->getSession()->get(self::SESSION_KEY, new MessageBag());
-    }
-
-    public function submitMessage(string $message): void
-    {
-        $messages = $this->loadMessages();
-
-        $messages->add(Message::ofUser($message));
-        $result = $this->agent->call($messages);
-
-        \assert($result instanceof TextResult);
-
-        $messages->add(Message::ofAssistant($result->getContent()));
-
-        $this->saveMessages($messages);
-    }
-
-    public function reset(): void
-    {
-        $this->requestStack->getSession()->remove(self::SESSION_KEY);
-    }
-
-    private function saveMessages(MessageBag $messages): void
-    {
-        $this->requestStack->getSession()->set(self::SESSION_KEY, $messages);
-    }
-}
diff --git a/demo/src/Audio/TwigComponent.php b/demo/src/Audio/TwigComponent.php
index dbb33a1be..61ac925d4 100644
--- a/demo/src/Audio/TwigComponent.php
+++ b/demo/src/Audio/TwigComponent.php
@@ -11,7 +11,16 @@
 
 namespace App\Audio;
 
+use Symfony\AI\Agent\AgentInterface;
+use Symfony\AI\Agent\Chat\MessageStoreInterface;
+use Symfony\AI\Agent\ChatInterface;
+use Symfony\AI\Platform\Bridge\OpenAi\Whisper;
+use Symfony\AI\Platform\Message\Content\Audio;
+use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageInterface;
+use Symfony\AI\Platform\PlatformInterface;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\UX\LiveComponent\Attribute\AsLiveComponent;
 use Symfony\UX\LiveComponent\Attribute\LiveAction;
 use Symfony\UX\LiveComponent\Attribute\LiveArg;
@@ -23,7 +32,14 @@ final class TwigComponent
     use DefaultActionTrait;
 
     public function __construct(
-        private readonly Chat $chat,
+        private readonly PlatformInterface $platform,
+        private readonly RequestStack $requestStack,
+        #[Autowire(service: 'ai.agent.audio')]
+        private readonly AgentInterface $agent,
+        #[Autowire(service: 'ai.chat.audio')]
+        private readonly ChatInterface $chat,
+        #[Autowire(service: 'ai.message_store.cache.audio')]
+        private readonly MessageStoreInterface $messageStore,
     ) {
     }
 
@@ -32,18 +48,24 @@ public function __construct(
      */
     public function getMessages(): array
     {
-        return $this->chat->loadMessages()->withoutSystemMessage()->getMessages();
+        return $this->chat->getCurrentMessageBag()->withoutSystemMessage()->getMessages();
     }
 
     #[LiveAction]
     public function submit(#[LiveArg] string $audio): void
     {
-        $this->chat->say($audio);
+        // Convert base64 to temporary binary file
+        $path = tempnam(sys_get_temp_dir(), 'audio-').'.wav';
+        file_put_contents($path, base64_decode($audio));
+
+        $result = $this->platform->invoke(new Whisper(), Audio::fromFile($path));
+
+        $this->chat->submit(Message::ofUser($result->asText()));
     }
 
     #[LiveAction]
     public function reset(): void
     {
-        $this->chat->reset();
+        $this->messageStore->clear();
     }
 }
diff --git a/demo/src/Wikipedia/Chat.php b/demo/src/Wikipedia/Chat.php
deleted file mode 100644
index cd9736f7a..000000000
--- a/demo/src/Wikipedia/Chat.php
+++ /dev/null
@@ -1,60 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace App\Wikipedia;
-
-use Symfony\AI\Agent\AgentInterface;
-use Symfony\AI\Platform\Message\Message;
-use Symfony\AI\Platform\Message\MessageBag;
-use Symfony\AI\Platform\Result\TextResult;
-use Symfony\Component\DependencyInjection\Attribute\Autowire;
-use Symfony\Component\HttpFoundation\RequestStack;
-
-final class Chat
-{
-    private const SESSION_KEY = 'wikipedia-chat';
-
-    public function __construct(
-        private readonly RequestStack $requestStack,
-        #[Autowire(service: 'ai.agent.wikipedia')]
-        private readonly AgentInterface $agent,
-    ) {
-    }
-
-    public function loadMessages(): MessageBag
-    {
-        return $this->requestStack->getSession()->get(self::SESSION_KEY, new MessageBag());
-    }
-
-    public function submitMessage(string $message): void
-    {
-        $messages = $this->loadMessages();
-
-        $messages->add(Message::ofUser($message));
-        $result = $this->agent->call($messages);
-
-        \assert($result instanceof TextResult);
-
-        $messages->add(Message::ofAssistant($result->getContent()));
-
-        $this->saveMessages($messages);
-    }
-
-    public function reset(): void
-    {
-        $this->requestStack->getSession()->remove(self::SESSION_KEY);
-    }
-
-    private function saveMessages(MessageBag $messages): void
-    {
-        $this->requestStack->getSession()->set(self::SESSION_KEY, $messages);
-    }
-}
diff --git a/demo/src/Wikipedia/TwigComponent.php b/demo/src/Wikipedia/TwigComponent.php
index d0f4897e9..0170428b6 100644
--- a/demo/src/Wikipedia/TwigComponent.php
+++ b/demo/src/Wikipedia/TwigComponent.php
@@ -11,7 +11,11 @@
 
 namespace App\Wikipedia;
 
+use Symfony\AI\Agent\Chat\MessageStoreInterface;
+use Symfony\AI\Agent\ChatInterface;
+use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageInterface;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
 use Symfony\UX\LiveComponent\Attribute\AsLiveComponent;
 use Symfony\UX\LiveComponent\Attribute\LiveAction;
 use Symfony\UX\LiveComponent\Attribute\LiveArg;
@@ -23,7 +27,10 @@ final class TwigComponent
     use DefaultActionTrait;
 
     public function __construct(
-        private readonly Chat $wikipedia,
+        #[Autowire(service: 'ai.chat.wikipedia')]
+        private readonly ChatInterface $chat,
+        #[Autowire(service: 'ai.message_store.cache.wikipedia')]
+        private readonly MessageStoreInterface $messageStore,
     ) {
     }
 
@@ -32,18 +39,18 @@ public function __construct(
      */
     public function getMessages(): array
     {
-        return $this->wikipedia->loadMessages()->withoutSystemMessage()->getMessages();
+        return $this->chat->getCurrentMessageBag()->getMessages();
     }
 
     #[LiveAction]
     public function submit(#[LiveArg] string $message): void
     {
-        $this->wikipedia->submitMessage($message);
+        $this->chat->submit(Message::ofUser($message));
     }
 
     #[LiveAction]
     public function reset(): void
     {
-        $this->wikipedia->reset();
+        $this->messageStore->clear();
     }
 }
diff --git a/demo/src/YouTube/Chat.php b/demo/src/YouTube/Chat.php
deleted file mode 100644
index 515da3ff7..000000000
--- a/demo/src/YouTube/Chat.php
+++ /dev/null
@@ -1,82 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace App\YouTube;
-
-use Symfony\AI\Agent\AgentInterface;
-use Symfony\AI\Platform\Message\Message;
-use Symfony\AI\Platform\Message\MessageBag;
-use Symfony\AI\Platform\Result\TextResult;
-use Symfony\Component\DependencyInjection\Attribute\Autowire;
-use Symfony\Component\HttpFoundation\RequestStack;
-
-final class Chat
-{
-    private const SESSION_KEY = 'youtube-chat';
-
-    public function __construct(
-        private readonly RequestStack $requestStack,
-        #[Autowire(service: 'ai.agent.youtube')]
-        private readonly AgentInterface $agent,
-        private readonly TranscriptFetcher $transcriptFetcher,
-    ) {
-    }
-
-    public function loadMessages(): MessageBag
-    {
-        return $this->requestStack->getSession()->get(self::SESSION_KEY, new MessageBag());
-    }
-
-    public function start(string $videoId): void
-    {
-        $transcript = $this->transcriptFetcher->fetchTranscript($videoId);
-        $system = <<<PROMPT
-            You are an helpful assistant that answers questions about a YouTube video based on a transcript.
-            If you can't answer a question, say so.
-
-            Video ID: {$videoId}
-            Transcript:
-            {$transcript}
-            PROMPT;
-
-        $messages = new MessageBag(
-            Message::forSystem($system),
-            Message::ofAssistant('What do you want to know about that video?'),
-        );
-
-        $this->reset();
-        $this->saveMessages($messages);
-    }
-
-    public function submitMessage(string $message): void
-    {
-        $messages = $this->loadMessages();
-
-        $messages->add(Message::ofUser($message));
-        $result = $this->agent->call($messages);
-
-        \assert($result instanceof TextResult);
-
-        $messages->add(Message::ofAssistant($result->getContent()));
-
-        $this->saveMessages($messages);
-    }
-
-    public function reset(): void
-    {
-        $this->requestStack->getSession()->remove(self::SESSION_KEY);
-    }
-
-    private function saveMessages(MessageBag $messages): void
-    {
-        $this->requestStack->getSession()->set(self::SESSION_KEY, $messages);
-    }
-}
diff --git a/demo/src/YouTube/TwigComponent.php b/demo/src/YouTube/TwigComponent.php
index 6675abd21..89a04016e 100644
--- a/demo/src/YouTube/TwigComponent.php
+++ b/demo/src/YouTube/TwigComponent.php
@@ -12,7 +12,12 @@
 namespace App\YouTube;
 
 use Psr\Log\LoggerInterface;
+use Symfony\AI\Agent\Chat\MessageStoreInterface;
+use Symfony\AI\Agent\ChatInterface;
+use Symfony\AI\Platform\Message\Message;
+use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\Message\MessageInterface;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
 use Symfony\UX\LiveComponent\Attribute\AsLiveComponent;
 use Symfony\UX\LiveComponent\Attribute\LiveAction;
 use Symfony\UX\LiveComponent\Attribute\LiveArg;
@@ -26,8 +31,12 @@ final class TwigComponent
     use DefaultActionTrait;
 
     public function __construct(
-        private readonly Chat $youTube,
         private readonly LoggerInterface $logger,
+        #[Autowire(service: 'ai.chat.youtube')]
+        private readonly ChatInterface $chat,
+        #[Autowire(service: 'ai.message_store.cache.youtube')]
+        private readonly MessageStoreInterface $messageStore,
+        private readonly TranscriptFetcher $transcriptFetcher,
     ) {
     }
 
@@ -39,10 +48,10 @@ public function start(#[LiveArg] string $videoId): void
         }
 
         try {
-            $this->youTube->start($videoId);
+            $this->doStart($videoId);
         } catch (\Exception $e) {
             $this->logger->error('Unable to start YouTube chat.', ['exception' => $e]);
-            $this->youTube->reset();
+            $this->messageStore->clear();
         }
     }
 
@@ -51,19 +60,19 @@ public function start(#[LiveArg] string $videoId): void
      */
     public function getMessages(): array
     {
-        return $this->youTube->loadMessages()->withoutSystemMessage()->getMessages();
+        return $this->chat->getCurrentMessageBag()->withoutSystemMessage()->getMessages();
     }
 
     #[LiveAction]
     public function submit(#[LiveArg] string $message): void
     {
-        $this->youTube->submitMessage($message);
+        $this->chat->submit(Message::ofUser($message));
     }
 
     #[LiveAction]
     public function reset(): void
     {
-        $this->youTube->reset();
+        $this->messageStore->clear();
     }
 
     private function getVideoIdFromUrl(string $url): string
@@ -76,4 +85,25 @@ private function getVideoIdFromUrl(string $url): string
 
         return u($query)->after('v=')->before('&')->toString();
     }
+
+    private function doStart(string $videoId): void
+    {
+        $transcript = $this->transcriptFetcher->fetchTranscript($videoId);
+        $system = <<<PROMPT
+            You are an helpful assistant that answers questions about a YouTube video based on a transcript.
+            If you can't answer a question, say so.
+
+            Video ID: {$videoId}
+            Transcript:
+            {$transcript}
+            PROMPT;
+
+        $messages = new MessageBag(
+            Message::forSystem($system),
+            Message::ofAssistant('What do you want to know about that video?'),
+        );
+
+        $this->reset();
+        $this->chat->initiate($messages);
+    }
 }
diff --git a/examples/composer.json b/examples/composer.json
index d3a4ebda1..0b338a6d1 100644
--- a/examples/composer.json
+++ b/examples/composer.json
@@ -17,6 +17,7 @@
         "probots-io/pinecone-php": "^1.0",
         "psr/http-factory-implementation": "*",
         "symfony/ai-agent": "@dev",
+        "symfony/ai-chat": "@dev",
         "symfony/ai-platform": "@dev",
         "symfony/ai-store": "@dev",
         "symfony/cache": "^7.3|^8.0",
diff --git a/examples/misc/persistent-chat-double-agent.php b/examples/misc/persistent-chat-double-agent.php
new file mode 100644
index 000000000..2be31bf06
--- /dev/null
+++ b/examples/misc/persistent-chat-double-agent.php
@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Symfony\AI\Agent\Agent;
+use Symfony\AI\Chat\Bridge\Local\InMemoryStore;
+use Symfony\AI\Chat\Chat;
+use Symfony\AI\Platform\Bridge\OpenAi\Gpt;
+use Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory;
+use Symfony\AI\Platform\Message\Message;
+use Symfony\AI\Platform\Message\MessageBag;
+
+require_once dirname(__DIR__).'/bootstrap.php';
+
+$platform = PlatformFactory::create(env('OPENAI_API_KEY'), http_client());
+$llm = new Gpt(Gpt::GPT_4O_MINI);
+
+$agent = new Agent($platform, $llm, logger: logger());
+
+$store = new InMemoryStore();
+
+$chat = new Chat($agent, $store);
+
+$chat->initiate(new MessageBag(
+    Message::forSystem('You are a helpful assistant. You only answer with short sentences.'),
+));
+
+$forkedChat = $chat->fork('fork');
+
+$chat->submit(Message::ofUser('My name is Christopher.'));
+$firstChatMessage = $chat->submit(Message::ofUser('What is my name?'));
+
+$forkedChat->submit(Message::ofUser('My name is William.'));
+$secondChatMessage = $forkedChat->submit(Message::ofUser('What is my name?'));
+
+$firstChatMessageContent = $firstChatMessage->content;
+$secondChatMessageContent = $secondChatMessage->content;
+
+echo $firstChatMessageContent.\PHP_EOL;
+echo $secondChatMessageContent.\PHP_EOL;
+
+assert(str_contains($firstChatMessageContent, 'Christopher'));
+assert(!str_contains($secondChatMessageContent, 'Christopher'));
diff --git a/examples/misc/persistent-chat.php b/examples/misc/persistent-chat.php
index 8b9df26fa..1ca812cf6 100644
--- a/examples/misc/persistent-chat.php
+++ b/examples/misc/persistent-chat.php
@@ -10,8 +10,8 @@
  */
 
 use Symfony\AI\Agent\Agent;
-use Symfony\AI\Agent\Chat;
-use Symfony\AI\Agent\Chat\MessageStore\InMemoryStore;
+use Symfony\AI\Chat\Bridge\Local\InMemoryStore;
+use Symfony\AI\Chat\Chat;
 use Symfony\AI\Platform\Bridge\OpenAi\Gpt;
 use Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory;
 use Symfony\AI\Platform\Message\Message;
diff --git a/src/agent/composer.json b/src/agent/composer.json
index 43d5cb4bb..bd566f2d9 100644
--- a/src/agent/composer.json
+++ b/src/agent/composer.json
@@ -24,6 +24,7 @@
         "phpdocumentor/reflection-docblock": "^5.4",
         "phpstan/phpdoc-parser": "^2.1",
         "psr/log": "^3.0",
+        "symfony/ai-chat": "@dev",
         "symfony/ai-platform": "@dev",
         "symfony/clock": "^7.3|^8.0",
         "symfony/http-client": "^7.3|^8.0",
diff --git a/src/agent/src/Chat/MessageStore/InMemoryStore.php b/src/agent/src/Chat/MessageStore/InMemoryStore.php
deleted file mode 100644
index 41e01ed1e..000000000
--- a/src/agent/src/Chat/MessageStore/InMemoryStore.php
+++ /dev/null
@@ -1,38 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\AI\Agent\Chat\MessageStore;
-
-use Symfony\AI\Agent\Chat\MessageStoreInterface;
-use Symfony\AI\Platform\Message\MessageBag;
-
-/**
- * @author Christopher Hertel <mail@christopher-hertel.de>
- */
-final class InMemoryStore implements MessageStoreInterface
-{
-    private MessageBag $messages;
-
-    public function save(MessageBag $messages): void
-    {
-        $this->messages = $messages;
-    }
-
-    public function load(): MessageBag
-    {
-        return $this->messages ?? new MessageBag();
-    }
-
-    public function clear(): void
-    {
-        $this->messages = new MessageBag();
-    }
-}
diff --git a/src/agent/tests/AgentTest.php b/src/agent/tests/AgentTest.php
index 06d4b8e34..579807fd2 100644
--- a/src/agent/tests/AgentTest.php
+++ b/src/agent/tests/AgentTest.php
@@ -19,6 +19,8 @@
 use Symfony\AI\Agent\Agent;
 use Symfony\AI\Agent\AgentAwareInterface;
 use Symfony\AI\Agent\AgentInterface;
+use Symfony\AI\Agent\Chat;
+use Symfony\AI\Agent\Chat\MessageStore\InMemoryStore;
 use Symfony\AI\Agent\Exception\InvalidArgumentException;
 use Symfony\AI\Agent\Exception\MissingModelSupportException;
 use Symfony\AI\Agent\Exception\RuntimeException;
@@ -30,6 +32,7 @@
 use Symfony\AI\Platform\Message\Content\Audio;
 use Symfony\AI\Platform\Message\Content\Image;
 use Symfony\AI\Platform\Message\Content\Text;
+use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\AI\Platform\Message\UserMessage;
 use Symfony\AI\Platform\Model;
@@ -37,6 +40,7 @@
 use Symfony\AI\Platform\Result\RawResultInterface;
 use Symfony\AI\Platform\Result\ResultInterface;
 use Symfony\AI\Platform\Result\ResultPromise;
+use Symfony\AI\Platform\Result\TextResult;
 use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;
 use Symfony\Contracts\HttpClient\Exception\HttpExceptionInterface;
 use Symfony\Contracts\HttpClient\ResponseInterface as HttpResponseInterface;
@@ -49,6 +53,8 @@
 #[UsesClass(Text::class)]
 #[UsesClass(Audio::class)]
 #[UsesClass(Image::class)]
+#[UsesClass(InMemoryStore::class)]
+#[UsesClass(Chat::class)]
 #[Small]
 final class AgentTest extends TestCase
 {
@@ -426,4 +432,35 @@ public function testGetNameReturnsProvidedName()
 
         $this->assertSame($name, $agent->getName());
     }
+
+    public function testMultipleAgentCanUseSameChat()
+    {
+        $platform = $this->createMock(PlatformInterface::class);
+        $platform->method('invoke')
+            ->willReturn(new ResultPromise(static fn (): TextResult => new TextResult('Assistant response'), $this->createStub(RawResultInterface::class)));
+
+        $model = $this->createMock(Model::class);
+
+        $firstAgent = new Agent($platform, $model);
+        $secondAgent = new Agent($platform, $model);
+
+        $store = new InMemoryStore();
+
+        $firstChat = new Chat($firstAgent, $store);
+        $secondChat = new Chat($secondAgent, $store);
+
+        $firstChat->initiate(new MessageBag(
+            Message::forSystem('You are a helpful assistant. You only answer with short sentences.'),
+        ));
+        $secondChat->initiate(new MessageBag(
+            Message::forSystem('You are a helpful assistant. You only answer with short sentences.'),
+        ));
+
+        $firstChat->submit(new UserMessage(new Text('Hello')));
+        $secondChat->submit(new UserMessage(new Text('Hello')));
+        $secondChat->submit(new UserMessage(new Text('Hello there')));
+
+        $this->assertCount(3, $store->load('foo'));
+        $this->assertCount(5, $store->load('bar'));
+    }
 }
diff --git a/src/ai-bundle/composer.json b/src/ai-bundle/composer.json
index 9ec551bad..8c70b3ca5 100644
--- a/src/ai-bundle/composer.json
+++ b/src/ai-bundle/composer.json
@@ -16,6 +16,7 @@
     "require": {
         "php": ">=8.2",
         "symfony/ai-agent": "@dev",
+        "symfony/ai-chat": "@dev",
         "symfony/ai-platform": "@dev",
         "symfony/ai-store": "@dev",
         "symfony/config": "^7.3|^8.0",
diff --git a/src/ai-bundle/config/options.php b/src/ai-bundle/config/options.php
index 795a4d49b..9a73d0317 100644
--- a/src/ai-bundle/config/options.php
+++ b/src/ai-bundle/config/options.php
@@ -585,6 +585,55 @@
                     ->end()
                 ->end()
             ->end()
+            ->arrayNode('message_store')
+                ->children()
+                    ->arrayNode('cache')
+                    ->useAttributeAsKey('name')
+                        ->arrayPrototype()
+                            ->children()
+                                ->scalarNode('service')->cannotBeEmpty()->defaultValue('cache.app')->end()
+                            ->end()
+                            ->children()
+                                ->scalarNode('identifier')->end()
+                            ->end()
+                            ->children()
+                                ->scalarNode('ttl')->end()
+                            ->end()
+                        ->end()
+                    ->end()
+                    ->arrayNode('memory')
+                    ->useAttributeAsKey('name')
+                        ->arrayPrototype()
+                            ->children()
+                                ->scalarNode('identifier')->end()
+                            ->end()
+                        ->end()
+                    ->end()
+                    ->arrayNode('session')
+                    ->useAttributeAsKey('name')
+                        ->arrayPrototype()
+                            ->children()
+                                ->scalarNode('identifier')->end()
+                            ->end()
+                        ->end()
+                    ->end()
+                ->end()
+            ->end()
+            ->arrayNode('chat')
+                ->useAttributeAsKey('name')
+                ->arrayPrototype()
+                    ->children()
+                        ->scalarNode('agent')
+                            ->isRequired()
+                            ->info('Name of the agent used for the chat')
+                        ->end()
+                        ->scalarNode('message_store')
+                            ->isRequired()
+                            ->info('Name of the message store (example: "cache.foo" for a message store called "foo" in the "cache" section)')
+                        ->end()
+                    ->end()
+                ->end()
+            ->end()
         ->end()
     ;
 };
diff --git a/src/ai-bundle/config/services.php b/src/ai-bundle/config/services.php
index 2437ef8d4..644c8987a 100644
--- a/src/ai-bundle/config/services.php
+++ b/src/ai-bundle/config/services.php
@@ -133,6 +133,8 @@
                 tagged_iterator('ai.traceable_platform'),
                 service('ai.toolbox'),
                 tagged_iterator('ai.traceable_toolbox'),
+                tagged_iterator('ai.traceable_message_store'),
+                tagged_iterator('ai.traceable_chat'),
             ])
             ->tag('data_collector')
         ->set('ai.traceable_toolbox', TraceableToolbox::class)
diff --git a/src/ai-bundle/doc/index.rst b/src/ai-bundle/doc/index.rst
index 83e2e5108..64ca7e487 100644
--- a/src/ai-bundle/doc/index.rst
+++ b/src/ai-bundle/doc/index.rst
@@ -144,6 +144,14 @@ Configuration
             research:
                 vectorizer: 'ai.vectorizer.mistral_embeddings'
                 store: 'ai.store.memory.research'
+        message_store:
+            cache:
+                main:
+                    service: 'cache.app'
+        chat:
+            main:
+                agent: 'research'
+                message_store: 'main'
 
 Store Dependency Injection
 --------------------------
diff --git a/src/ai-bundle/src/AiBundle.php b/src/ai-bundle/src/AiBundle.php
index cc656361b..0c6318144 100644
--- a/src/ai-bundle/src/AiBundle.php
+++ b/src/ai-bundle/src/AiBundle.php
@@ -29,9 +29,17 @@
 use Symfony\AI\Agent\Toolbox\ToolFactory\MemoryToolFactory;
 use Symfony\AI\AiBundle\DependencyInjection\ProcessorCompilerPass;
 use Symfony\AI\AiBundle\Exception\InvalidArgumentException;
+use Symfony\AI\AiBundle\Profiler\TraceableChat;
+use Symfony\AI\AiBundle\Profiler\TraceableMessageStore;
 use Symfony\AI\AiBundle\Profiler\TraceablePlatform;
 use Symfony\AI\AiBundle\Profiler\TraceableToolbox;
 use Symfony\AI\AiBundle\Security\Attribute\IsGrantedTool;
+use Symfony\AI\Chat\Bridge\Local\CacheStore as CacheMessageStore;
+use Symfony\AI\Chat\Bridge\Local\InMemoryStore as InMemoryMessageStore;
+use Symfony\AI\Chat\Bridge\Symfony\SessionStore as SessionMessageStore;
+use Symfony\AI\Chat\Chat;
+use Symfony\AI\Chat\ChatInterface;
+use Symfony\AI\Chat\MessageStoreInterface;
 use Symfony\AI\Platform\Bridge\Anthropic\PlatformFactory as AnthropicPlatformFactory;
 use Symfony\AI\Platform\Bridge\Azure\OpenAi\PlatformFactory as AzureOpenAiPlatformFactory;
 use Symfony\AI\Platform\Bridge\Cerebras\PlatformFactory as CerebrasPlatformFactory;
@@ -163,6 +171,46 @@ public function loadExtension(array $config, ContainerConfigurator $container, C
             $builder->setAlias(IndexerInterface::class, 'ai.indexer.'.$indexerName);
         }
 
+        foreach ($config['message_store'] ?? [] as $messageStoreName => $store) {
+            $this->processMessageStoreConfig($messageStoreName, $store, $builder);
+        }
+
+        $messageStores = array_keys($builder->findTaggedServiceIds('ai.message_store'));
+        if (1 === \count($messageStores)) {
+            $builder->setAlias(MessageStoreInterface::class, reset($messageStores));
+        }
+
+        if ($builder->getParameter('kernel.debug')) {
+            foreach ($messageStores as $messageStore) {
+                $traceableMessageStoreDefinition = (new Definition(TraceableMessageStore::class))
+                    ->setDecoratedService($messageStore)
+                    ->setArguments([new Reference('.inner')])
+                    ->addTag('ai.traceable_message_store');
+                $suffix = u($messageStore)->afterLast('.')->toString();
+                $builder->setDefinition('ai.traceable_message_store.'.$suffix, $traceableMessageStoreDefinition);
+            }
+        }
+
+        foreach ($config['chat'] as $chatName => $chat) {
+            $this->processChatConfig($chatName, $chat, $builder);
+        }
+
+        $chats = array_keys($builder->findTaggedServiceIds('ai.chat'));
+        if (1 === \count($chats)) {
+            $builder->setAlias(ChatInterface::class, reset($chats));
+        }
+
+        if ($builder->getParameter('kernel.debug')) {
+            foreach ($chats as $chat) {
+                $traceableChatDefinition = (new Definition(TraceableChat::class))
+                    ->setDecoratedService($chat)
+                    ->setArguments([new Reference('.inner')])
+                    ->addTag('ai.traceable_chat');
+                $suffix = u($chat)->afterLast('.')->toString();
+                $builder->setDefinition('ai.traceable_chat.'.$suffix, $traceableChatDefinition);
+            }
+        }
+
         $builder->registerAttributeForAutoconfiguration(AsTool::class, static function (ChildDefinition $definition, AsTool $attribute): void {
             $definition->addTag('ai.tool', [
                 'name' => $attribute->name,
@@ -1185,4 +1233,80 @@ private function processIndexerConfig(int|string $name, array $config, Container
 
         $container->setDefinition('ai.indexer.'.$name, $definition);
     }
+
+    /**
+     * @param array<string, mixed> $stores
+     */
+    private function processMessageStoreConfig(string $type, array $stores, ContainerBuilder $container): void
+    {
+        if ('cache' === $type) {
+            foreach ($stores as $name => $store) {
+                $arguments = [
+                    new Reference($store['service']),
+                    $store['identifier'] ?? $name,
+                ];
+
+                if (\array_key_exists('ttl', $store)) {
+                    $arguments[] = $store['ttl'];
+                }
+
+                $definition = new Definition(CacheMessageStore::class);
+                $definition
+                    ->addTag('ai.message_store')
+                    ->setArguments([
+                        new Reference($store['service']),
+                        $store['identifier'] ?? $name,
+                    ]);
+
+                $container->setDefinition('ai.message_store.'.$type.'.'.$name, $definition);
+                $container->registerAliasForArgument('ai.message_store.'.$type.'.'.$name, MessageStoreInterface::class, (new Target($name.'MessageStore'))->getParsedName());
+            }
+        }
+
+        if ('memory' === $type) {
+            foreach ($stores as $name => $store) {
+                $definition = new Definition(InMemoryMessageStore::class);
+                $definition
+                    ->addTag('ai.message_store')
+                    ->setArguments([
+                        $store['identifier'] ?? $name,
+                    ]);
+
+                $container->setDefinition('ai.message_store.'.$type.'.'.$name, $definition);
+                $container->registerAliasForArgument('ai.message_store.'.$type.'.'.$name, MessageStoreInterface::class, (new Target($name.'MessageStore'))->getParsedName());
+            }
+        }
+
+        if ('session' === $type) {
+            foreach ($stores as $name => $store) {
+                $definition = new Definition(SessionMessageStore::class);
+                $definition
+                    ->addTag('ai.message_store')
+                    ->setArguments([
+                        new Reference('request_stack'),
+                        $store['identifier'] ?? $name,
+                    ]);
+
+                $container->setDefinition('ai.message_store.'.$type.'.'.$name, $definition);
+                $container->registerAliasForArgument('ai.message_store.'.$type.'.'.$name, MessageStoreInterface::class, (new Target($name.'MessageStore'))->getParsedName());
+            }
+        }
+    }
+
+    /**
+     * @param array<string, mixed> $config
+     */
+    private function processChatConfig(int|string $name, array $config, ContainerBuilder $container): void
+    {
+        $definition = new Definition(Chat::class);
+        $definition
+            ->setArguments([
+                new Reference('ai.agent.'.$config['agent']),
+                new Reference('ai.message_store.'.$config['message_store']),
+            ])
+            ->addTag('ai.chat');
+
+        $container->setDefinition('ai.chat.'.$name, $definition);
+        $container->registerAliasForArgument('ai.chat.'.$name, ChatInterface::class, (new Target($name.'Chat'))->getParsedName());
+    }
 }
diff --git a/src/ai-bundle/src/Profiler/DataCollector.php b/src/ai-bundle/src/Profiler/DataCollector.php
index e3041a2d6..a9587e093 100644
--- a/src/ai-bundle/src/Profiler/DataCollector.php
+++ b/src/ai-bundle/src/Profiler/DataCollector.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\AI\AiBundle\Profiler;
 
+use Symfony\AI\Agent\Chat\MessageStoreInterface;
+use Symfony\AI\Agent\ChatInterface;
 use Symfony\AI\Agent\Toolbox\ToolboxInterface;
 use Symfony\AI\Platform\Model;
 use Symfony\AI\Platform\Tool\Tool;
@@ -24,6 +26,7 @@
  *
  * @phpstan-import-type PlatformCallData from TraceablePlatform
  * @phpstan-import-type ToolCallData from TraceableToolbox
+ * @phpstan-import-type MessageStoreData from TraceableMessageStore
  */
 final class DataCollector extends AbstractDataCollector implements LateDataCollectorInterface
 {
@@ -38,16 +41,32 @@ final class DataCollector extends AbstractDataCollector implements LateDataColle
     private readonly array $toolboxes;
 
     /**
-     * @param TraceablePlatform[] $platforms
-     * @param TraceableToolbox[]  $toolboxes
+     * @var MessageStoreInterface[]
+     */
+    private readonly array $messageStores;
+
+    /**
+     * @var ChatInterface[]
+     */
+    private readonly array $chats;
+
+    /**
+     * @param TraceablePlatform[]     $platforms
+     * @param TraceableToolbox[]      $toolboxes
+     * @param TraceableMessageStore[] $messageStores
+     * @param TraceableChat[]         $chats
      */
     public function __construct(
         iterable $platforms,
         private readonly ToolboxInterface $defaultToolBox,
         iterable $toolboxes,
+        iterable $messageStores,
+        iterable $chats,
     ) {
         $this->platforms = $platforms instanceof \Traversable ? iterator_to_array($platforms) : $platforms;
         $this->toolboxes = $toolboxes instanceof \Traversable ? iterator_to_array($toolboxes) : $toolboxes;
+        $this->messageStores = $messageStores instanceof \Traversable ? iterator_to_array($messageStores) : $messageStores;
+        $this->chats = $chats instanceof \Traversable ? iterator_to_array($chats) : $chats;
     }
 
     public function collect(Request $request, Response $response, ?\Throwable $exception = null): void
@@ -60,7 +79,9 @@ public function lateCollect(): void
         $this->data = [
             'tools' => $this->defaultToolBox->getTools(),
             'platform_calls' => array_merge(...array_map($this->awaitCallResults(...), $this->platforms)),
-            'tool_calls' => array_merge(...array_map(fn (TraceableToolbox $toolbox) => $toolbox->calls, $this->toolboxes)),
+            'tool_calls' => array_merge(...array_map(static fn (TraceableToolbox $toolbox): array => $toolbox->calls, $this->toolboxes)),
+            'message_stores' => array_merge(...array_map(static fn (TraceableMessageStore $messageStore): array => $messageStore->messages, $this->messageStores)),
+            'chats_ids' => array_map(static fn (TraceableChat $chat): string => $chat->getId(), $this->chats),
         ];
     }
 
@@ -93,6 +114,22 @@ public function getToolCalls(): array
         return $this->data['tool_calls'] ?? [];
     }
 
+    /**
+     * @return MessageStoreData[]
+     */
+    public function getMessageStores(): array
+    {
+        return $this->data['message_stores'] ?? [];
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getChatsIds(): array
+    {
+        return $this->data['chats_ids'] ?? [];
+    }
+
     /**
      * @return array{
      *     model: Model,
diff --git a/src/ai-bundle/src/Profiler/TraceableChat.php b/src/ai-bundle/src/Profiler/TraceableChat.php
new file mode 100644
index 000000000..35fafe32c
--- /dev/null
+++ b/src/ai-bundle/src/Profiler/TraceableChat.php
@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\AiBundle\Profiler;
+
+use Symfony\AI\Chat\ChatInterface;
+use Symfony\AI\Platform\Message\AssistantMessage;
+use Symfony\AI\Platform\Message\MessageBag;
+use Symfony\AI\Platform\Message\UserMessage;
+
+/**
+ * @author Guillaume Loulier <personal@guillaumeloulier.fr>
+ */
+final readonly class TraceableChat implements ChatInterface
+{
+    public function __construct(
+        private ChatInterface $chat,
+    ) {
+    }
+
+    public function initiate(MessageBag $messages, ?string $id = null): void
+    {
+        $this->chat->initiate($messages, $id);
+    }
+
+    public function submit(UserMessage $message, ?string $id = null): AssistantMessage
+    {
+        return $this->chat->submit($message, $id);
+    }
+}
diff --git a/src/ai-bundle/src/Profiler/TraceableMessageStore.php b/src/ai-bundle/src/Profiler/TraceableMessageStore.php
new file mode 100644
index 000000000..f7adb4990
--- /dev/null
+++ b/src/ai-bundle/src/Profiler/TraceableMessageStore.php
@@ -0,0 +1,61 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\AiBundle\Profiler;
+
+use Symfony\AI\Chat\MessageStoreInterface;
+use Symfony\AI\Platform\Message\MessageBag;
+
+/**
+ * @author Guillaume Loulier <personal@guillaumeloulier.fr>
+ *
+ * @phpstan-type MessageStoreData array<string, array{
+ *      message: MessageBag,
+ *      time: \DateTimeImmutable,
+ *  }>
+ */
+final class TraceableMessageStore implements MessageStoreInterface
+{
+    /**
+     * @var MessageStoreData[]
+     */
+    public array $messages = [];
+
+    public function __construct(
+        private readonly MessageStoreInterface $store,
+    ) {
+    }
+
+    public function save(MessageBag $messages, ?string $id = null): void
+    {
+        $this->store->save($messages, $id);
+
+        $this->messages[$id ?? $this->store->getId()][] = [
+            'message' => $messages,
+            'time' => new \DateTimeImmutable(),
+        ];
+    }
+
+    public function load(?string $id = null): MessageBag
+    {
+        return $this->store->load($id);
+    }
+
+    public function clear(?string $id = null): void
+    {
+        $this->store->clear($id);
+    }
+
+    public function getId(): string
+    {
+        return $this->store->getId();
+    }
+}
diff --git a/src/ai-bundle/templates/data_collector.html.twig b/src/ai-bundle/templates/data_collector.html.twig
index 359189784..e98b1c3aa 100644
--- a/src/ai-bundle/templates/data_collector.html.twig
+++ b/src/ai-bundle/templates/data_collector.html.twig
@@ -79,6 +79,17 @@
                 <span class="label">Tool Calls</span>
             </div>
         </div>
+        <div class="metric-divider"></div>
+        <div class="metric-group">
+            <div class="metric">
+                <span class="value">{{- collector.chatsIds|length -}}</span>
+                <span class="label">Chats</span>
+            </div>
+            <div class="metric">
+                <span class="value">{{- collector.messageStores|length -}}</span>
+                <span class="label">Chats calls</span>
+            </div>
+        </div>
     </section>
     <h3>Platform Calls</h3>
     {% if collector.platformCalls|length %}
diff --git a/src/ai-bundle/tests/DependencyInjection/AiBundleTest.php b/src/ai-bundle/tests/DependencyInjection/AiBundleTest.php
index 60b452372..c0f8008fc 100644
--- a/src/ai-bundle/tests/DependencyInjection/AiBundleTest.php
+++ b/src/ai-bundle/tests/DependencyInjection/AiBundleTest.php
@@ -2117,6 +2117,45 @@ public function testIndexerWithSourceFiltersAndTransformers()
         $this->assertSame('logger', (string) $arguments[6]);
     }
 
+    public function testAgentsWithChatCanBeDefined()
+    {
+        $container = $this->buildContainer([
+            'ai' => [
+                'agent' => [
+                    'another_agent' => [
+                        'model' => [
+                            'class' => 'Symfony\AI\Platform\Bridge\Anthropic\Claude',
+                            'name' => 'claude-3-opus-20240229',
+                        ],
+                        'system_prompt' => 'Be concise.',
+                    ],
+                ],
+                'message_store' => [
+                    'cache' => [
+                        'main_cache' => [
+                            'service' => 'cache.app',
+                        ],
+                    ],
+                ],
+                'chat' => [
+                    'main' => [
+                        'agent' => 'another_agent',
+                        'message_store' => 'cache',
+                    ],
+                    'second' => [
+                        'agent' => 'another_agent',
+                        'message_store' => 'cache',
+                    ],
+                ],
+            ],
+        ]);
+
+        $this->assertTrue($container->hasAlias('Symfony\AI\Agent\ChatInterface'));
+        $this->assertTrue($container->hasAlias('Symfony\AI\Agent\Chat\MessageStoreInterface'));
+        $this->assertTrue($container->hasDefinition('ai.message_store.cache.main_cache'));
+        $this->assertTrue($container->hasDefinition('ai.chat.main'));
+    }
+
     private function buildContainer(array $configuration): ContainerBuilder
     {
         $container = new ContainerBuilder();
@@ -2386,6 +2425,37 @@ private function getFullConfig(): array
                         'store' => 'my_azure_search_store_service_id',
                     ],
                 ],
+                'message_store' => [
+                    'cache' => [
+                        'my_cache_message_store' => [
+                            'service' => 'cache.system',
+                            'identifier' => 'foo',
+                        ],
+                        'my_cache_message_store_with_ttl' => [
+                            'service' => 'cache.system',
+                            'identifier' => 'foo',
+                            'ttl' => 3600,
+                        ],
+                        'my_memory_message_store' => [],
+                        'my_session_message_store' => [
+                            'identifier' => 'bar',
+                        ],
+                    ],
+                ],
+                'chat' => [
+                    'my_main_chat_with_cache_store' => [
+                        'agent' => 'my_chat_agent',
+                        'message_store' => 'my_cache_message_store',
+                    ],
+                    'my_second_chat_with_memory_store' => [
+                        'agent' => 'my_chat_agent',
+                        'message_store' => 'my_memory_message_store',
+                    ],
+                    'my_chat_with_session_store' => [
+                        'agent' => 'my_chat_agent',
+                        'message_store' => 'my_session_message_store',
+                    ],
+                ],
             ],
         ];
     }
diff --git a/src/ai-bundle/tests/Profiler/DataCollectorTest.php b/src/ai-bundle/tests/Profiler/DataCollectorTest.php
index 5c5bd4a13..ba2071f44 100644
--- a/src/ai-bundle/tests/Profiler/DataCollectorTest.php
+++ b/src/ai-bundle/tests/Profiler/DataCollectorTest.php
@@ -44,7 +44,7 @@ public function testCollectsDataForNonStreamingResponse()
         $result = $traceablePlatform->invoke($this->createStub(Model::class), $messageBag, ['stream' => false]);
         $this->assertSame('Assistant response', $result->asText());
 
-        $dataCollector = new DataCollector([$traceablePlatform], $this->createStub(ToolboxInterface::class), []);
+        $dataCollector = new DataCollector([$traceablePlatform], $this->createStub(ToolboxInterface::class), [], [], []);
         $dataCollector->lateCollect();
 
         $this->assertCount(1, $dataCollector->getPlatformCalls());
@@ -68,7 +68,7 @@ public function testCollectsDataForStreamingResponse()
         $result = $traceablePlatform->invoke($this->createStub(Model::class), $messageBag, ['stream' => true]);
         $this->assertSame('Assistant response', implode('', iterator_to_array($result->asStream())));
 
-        $dataCollector = new DataCollector([$traceablePlatform], $this->createStub(ToolboxInterface::class), []);
+        $dataCollector = new DataCollector([$traceablePlatform], $this->createStub(ToolboxInterface::class), [], [], []);
         $dataCollector->lateCollect();
 
         $this->assertCount(1, $dataCollector->getPlatformCalls());
diff --git a/src/ai-bundle/tests/Profiler/TraceableChatTest.php b/src/ai-bundle/tests/Profiler/TraceableChatTest.php
new file mode 100644
index 000000000..0182d1517
--- /dev/null
+++ b/src/ai-bundle/tests/Profiler/TraceableChatTest.php
@@ -0,0 +1,59 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\AiBundle\Tests\Profiler;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\AgentInterface;
+use Symfony\AI\Agent\Chat;
+use Symfony\AI\AiBundle\Profiler\TraceableChat;
+use Symfony\AI\Chat\Bridge\Local\InMemoryStore;
+use Symfony\AI\Platform\Message\Message;
+use Symfony\AI\Platform\Result\TextResult;
+
+#[CoversClass(TraceableChat::class)]
+#[UsesClass(InMemoryStore::class)]
+#[UsesClass(Chat::class)]
+#[UsesClass(Message::class)]
+#[UsesClass(TextResult::class)]
+final class TraceableChatTest extends TestCase
+{
+    public function testCurrentMessageBagCanBeRetrieved()
+    {
+        $agent = $this->createMock(AgentInterface::class);
+        $agent->expects($this->once())->method('call')->willReturn(new TextResult('foo'));
+
+        $store = new InMemoryStore('foo');
+        $chat = new Chat($agent, $store);
+
+        $traceableChat = new TraceableChat($chat);
+        $traceableChat->submit(Message::ofUser('foo'));
+
+        $this->assertCount(2, $traceableChat->getCurrentMessageBag());
+    }
+
+    public function testSpecificMessageBagCanBeRetrieved()
+    {
+        $agent = $this->createMock(AgentInterface::class);
+        $agent->expects($this->once())->method('call')->willReturn(new TextResult('foo'));
+
+        $store = new InMemoryStore('foo');
+        $chat = new Chat($agent, $store);
+
+        $traceableChat = new TraceableChat($chat);
+        $traceableChat->submit(Message::ofUser('foo'));
+
+        $this->assertCount(2, $traceableChat->getCurrentMessageBag());
+        $this->assertCount(0, $traceableChat->getMessageBag('bar'));
+    }
+}
diff --git a/src/ai-bundle/tests/Profiler/TraceableMessageStoreTest.php b/src/ai-bundle/tests/Profiler/TraceableMessageStoreTest.php
new file mode 100644
index 000000000..8eaf82b1e
--- /dev/null
+++ b/src/ai-bundle/tests/Profiler/TraceableMessageStoreTest.php
@@ -0,0 +1,85 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\AiBundle\Tests\Profiler;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+use Symfony\AI\AiBundle\Profiler\TraceableMessageStore;
+use Symfony\AI\Chat\Bridge\Local\InMemoryStore;
+use Symfony\AI\Platform\Message\Message;
+use Symfony\AI\Platform\Message\MessageBag;
+
+#[CoversClass(TraceableMessageStore::class)]
+#[UsesClass(TraceableMessageStore::class)]
+#[UsesClass(InMemoryStore::class)]
+#[UsesClass(MessageBag::class)]
+#[UsesClass(Message::class)]
+final class TraceableMessageStoreTest extends TestCase
+{
+    public function testStoreIsConfigured()
+    {
+        $messageStore = new InMemoryStore();
+
+        $traceableMessageStore = new TraceableMessageStore($messageStore);
+
+        $this->assertSame('_message_store_memory', $traceableMessageStore->getId());
+    }
+
+    public function testMessagesCanBeSaved()
+    {
+        $messageStore = new InMemoryStore();
+
+        $traceableMessageStore = new TraceableMessageStore($messageStore);
+        $traceableMessageStore->save(new MessageBag(
+            Message::ofUser('foo'),
+        ));
+
+        $this->assertArrayHasKey('_message_store_memory', $traceableMessageStore->messages);
+        $this->assertCount(1, $traceableMessageStore->messages['_message_store_memory']);
+
+        $traceableMessageStore->save(new MessageBag(
+            Message::ofUser('bar'),
+        ), 'bar');
+
+        $this->assertArrayHasKey('bar', $traceableMessageStore->messages);
+        $this->assertCount(1, $traceableMessageStore->messages['bar']);
+    }
+
+    public function testMessagesCanBeLoaded()
+    {
+        $messageStore = new InMemoryStore();
+
+        $traceableMessageStore = new TraceableMessageStore($messageStore);
+        $traceableMessageStore->save(new MessageBag(
+            Message::ofUser('foo'),
+        ));
+
+        $this->assertCount(1, $traceableMessageStore->load());
+    }
+
+    public function testMessagesCanBeCleared()
+    {
+        $messageStore = new InMemoryStore();
+
+        $traceableMessageStore = new TraceableMessageStore($messageStore);
+        $traceableMessageStore->save(new MessageBag(
+            Message::ofUser('foo'),
+        ));
+
+        $this->assertCount(1, $traceableMessageStore->load());
+
+        $traceableMessageStore->clear();
+
+        $this->assertCount(0, $traceableMessageStore->load());
+    }
+}
diff --git a/src/chat/.gitattributes b/src/chat/.gitattributes
new file mode 100644
index 000000000..9cf0aaea6
--- /dev/null
+++ b/src/chat/.gitattributes
@@ -0,0 +1,8 @@
+/.github export-ignore
+/tests export-ignore
+.gitattributes export-ignore
+.gitignore export-ignore
+phpstan.dist.neon export-ignore
+phpunit.xml.dist export-ignore
+CLAUDE.md export-ignore
+AGENTS.md export-ignore
diff --git a/src/chat/LICENSE b/src/chat/LICENSE
new file mode 100644
index 000000000..bc38d714e
--- /dev/null
+++ b/src/chat/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2025-present Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/src/chat/README.md b/src/chat/README.md
new file mode 100644
index 000000000..3304389e2
--- /dev/null
+++ b/src/chat/README.md
@@ -0,0 +1,24 @@
+# Symfony AI - Chat Component
+
+The Chat component provides a low-level abstraction for triggering chat with an agent.
+
+**This Component is experimental**.
+[Experimental features](https://symfony.com/doc/current/contributing/code/experimental.html)
+are not covered by Symfony's
+[Backward Compatibility Promise](https://symfony.com/doc/current/contributing/code/bc.html).
+
+## Installation
+
+```bash
+composer require symfony/ai-chat
+```
+
+**This repository is a READ-ONLY sub-tree split**. See
+https://github.com/symfony/ai to create issues or submit pull requests.
+
+## Resources
+
+- [Documentation](doc/index.rst)
+- [Report issues](https://github.com/symfony/ai/issues) and
+  [send Pull Requests](https://github.com/symfony/ai/pulls)
+  in the [main Symfony AI repository](https://github.com/symfony/ai)
diff --git a/src/chat/composer.json b/src/chat/composer.json
new file mode 100644
index 000000000..0f6e7c6b3
--- /dev/null
+++ b/src/chat/composer.json
@@ -0,0 +1,60 @@
+{
+    "name": "symfony/ai-chat",
+    "description": "Low-level abstraction for triggering chat with an agent.",
+    "license": "MIT",
+    "type": "library",
+    "keywords": [
+        "chat",
+        "agent",
+        "store",
+        "message"
+    ],
+    "authors": [
+        {
+            "name": "Christopher Hertel",
+            "email": "mail@christopher-hertel.de"
+        },
+        {
+            "name": "Oskar Stark",
+            "email": "oskarstark@googlemail.com"
+        }
+    ],
+    "require": {
+        "php": ">=8.2",
+        "psr/log": "^3.0",
+        "symfony/ai-agent": "@dev",
+        "symfony/ai-platform": "@dev",
+        "symfony/http-client": "^6.4 || ^7.1"
+    },
+    "require-dev": {
+        "phpstan/phpstan": "^2.0",
+        "phpunit/phpunit": "^11.5",
+        "psr/cache": "^3.0",
+        "symfony/cache": "^6.4 || ^7.1",
+        "symfony/http-foundation": "^6.4 || ^7.1"
+    },
+    "suggest": {
+        "psr/cache": "To use any PSR-16 cache as a message store",
+        "symfony/http-foundation": "To use the session as a message store"
+    },
+    "autoload": {
+        "psr-4": {
+            "Symfony\\AI\\Chat\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Symfony\\AI\\PHPStan\\": "../../.phpstan/",
+            "Symfony\\AI\\Chat\\Tests\\": "tests/"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "extra": {
+        "thanks": {
+            "name": "symfony/ai",
+            "url": "https://github.com/symfony/ai"
+        }
+    }
+}
diff --git a/src/chat/doc/index.rst b/src/chat/doc/index.rst
new file mode 100644
index 000000000..54189b575
--- /dev/null
+++ b/src/chat/doc/index.rst
@@ -0,0 +1,16 @@
+Symfony AI - Chat Component
+============================
+
+The Chat component provides a low-level abstraction for triggering a chat with an agent.
+
+Installation
+------------
+
+Install the component using Composer:
+
+.. code-block:: terminal
+
+    composer require symfony/ai-chat
+
+Purpose
+-------
diff --git a/src/chat/phpstan.dist.neon b/src/chat/phpstan.dist.neon
new file mode 100644
index 000000000..988f6c4d0
--- /dev/null
+++ b/src/chat/phpstan.dist.neon
@@ -0,0 +1,12 @@
+includes:
+    - ../../.phpstan/extension.neon
+
+parameters:
+    level: 6
+    paths:
+        - src/
+        - tests/
+    treatPhpDocTypesAsCertain: false
+    ignoreErrors:
+        -
+            message: "#^Method .*::test.*\\(\\) has no return type specified\\.$#"
diff --git a/src/chat/phpunit.xml.dist b/src/chat/phpunit.xml.dist
new file mode 100644
index 000000000..7c04fa4fb
--- /dev/null
+++ b/src/chat/phpunit.xml.dist
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.5/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         cacheDirectory=".phpunit.cache"
+         colors="true"
+         executionOrder="depends,defects"
+         requireCoverageMetadata="true"
+         beStrictAboutCoverageMetadata="true"
+         beStrictAboutOutputDuringTests="true"
+         failOnRisky="true"
+         failOnWarning="true">
+    <testsuites>
+        <testsuite name="default">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <source ignoreIndirectDeprecations="true" restrictNotices="true" restrictWarnings="true">
+        <include>
+            <directory>src</directory>
+        </include>
+    </source>
+</phpunit>
diff --git a/src/agent/src/Chat/MessageStore/CacheStore.php b/src/chat/src/Bridge/Local/CacheStore.php
similarity index 61%
rename from src/agent/src/Chat/MessageStore/CacheStore.php
rename to src/chat/src/Bridge/Local/CacheStore.php
index e3875baba..4413cab4f 100644
--- a/src/agent/src/Chat/MessageStore/CacheStore.php
+++ b/src/chat/src/Bridge/Local/CacheStore.php
@@ -9,31 +9,36 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Agent\Chat\MessageStore;
+namespace Symfony\AI\Chat\Bridge\Local;
 
 use Psr\Cache\CacheItemPoolInterface;
-use Symfony\AI\Agent\Chat\MessageStoreInterface;
 use Symfony\AI\Agent\Exception\RuntimeException;
+use Symfony\AI\Chat\MessageStoreIdentifierTrait;
+use Symfony\AI\Chat\MessageStoreInterface;
 use Symfony\AI\Platform\Message\MessageBag;
 
 /**
  * @author Christopher Hertel <mail@christopher-hertel.de>
  */
-final readonly class CacheStore implements MessageStoreInterface
+final class CacheStore implements MessageStoreInterface
 {
+    use MessageStoreIdentifierTrait;
+
     public function __construct(
         private CacheItemPoolInterface $cache,
-        private string $cacheKey,
+        string $id = '_message_store_cache',
         private int $ttl = 86400,
     ) {
         if (!interface_exists(CacheItemPoolInterface::class)) {
             throw new RuntimeException('For using the CacheStore as message store, a PSR-6 cache implementation is required. Try running "composer require symfony/cache" or another PSR-6 compatible cache.');
         }
+
+        $this->setId($id);
     }
 
-    public function save(MessageBag $messages): void
+    public function save(MessageBag $messages, ?string $id = null): void
     {
-        $item = $this->cache->getItem($this->cacheKey);
+        $item = $this->cache->getItem($id ?? $this->getId());
 
         $item->set($messages);
         $item->expiresAfter($this->ttl);
@@ -41,15 +46,15 @@ public function save(MessageBag $messages): void
         $this->cache->save($item);
     }
 
-    public function load(): MessageBag
+    public function load(?string $id = null): MessageBag
     {
-        $item = $this->cache->getItem($this->cacheKey);
+        $item = $this->cache->getItem($id ?? $this->getId());
 
         return $item->isHit() ? $item->get() : new MessageBag();
     }
 
-    public function clear(): void
+    public function clear(?string $id = null): void
     {
-        $this->cache->deleteItem($this->cacheKey);
+        $this->cache->deleteItem($id ?? $this->getId());
     }
 }
diff --git a/src/chat/src/Bridge/Local/InMemoryStore.php b/src/chat/src/Bridge/Local/InMemoryStore.php
new file mode 100644
index 000000000..f82c1a13e
--- /dev/null
+++ b/src/chat/src/Bridge/Local/InMemoryStore.php
@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Chat\Bridge\Local;
+
+use Symfony\AI\Chat\MessageStoreIdentifierTrait;
+use Symfony\AI\Chat\MessageStoreInterface;
+use Symfony\AI\Platform\Message\MessageBag;
+
+/**
+ * @author Christopher Hertel <mail@christopher-hertel.de>
+ */
+final class InMemoryStore implements MessageStoreInterface
+{
+    use MessageStoreIdentifierTrait;
+
+    /**
+     * @var MessageBag[]
+     */
+    private array $messageBags;
+
+    public function __construct(
+        string $id = '_message_store_memory',
+    ) {
+        $this->setId($id);
+    }
+
+    public function save(MessageBag $messages, ?string $id = null): void
+    {
+        $this->messageBags[$id ?? $this->getId()] = $messages;
+    }
+
+    public function load(?string $id = null): MessageBag
+    {
+        return $this->messageBags[$id ?? $this->getId()] ?? new MessageBag();
+    }
+
+    public function clear(?string $id = null): void
+    {
+        $this->messageBags[$id ?? $this->getId()] = new MessageBag();
+    }
+}
diff --git a/src/agent/src/Chat/MessageStore/SessionStore.php b/src/chat/src/Bridge/Symfony/SessionStore.php
similarity index 56%
rename from src/agent/src/Chat/MessageStore/SessionStore.php
rename to src/chat/src/Bridge/Symfony/SessionStore.php
index b5a0cea63..411268467 100644
--- a/src/agent/src/Chat/MessageStore/SessionStore.php
+++ b/src/chat/src/Bridge/Symfony/SessionStore.php
@@ -9,10 +9,11 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Agent\Chat\MessageStore;
+namespace Symfony\AI\Chat\Bridge\Symfony;
 
-use Symfony\AI\Agent\Chat\MessageStoreInterface;
-use Symfony\AI\Agent\Exception\RuntimeException;
+use Symfony\AI\Chat\Exception\RuntimeException;
+use Symfony\AI\Chat\MessageStoreIdentifierTrait;
+use Symfony\AI\Chat\MessageStoreInterface;
 use Symfony\AI\Platform\Message\MessageBag;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Session\SessionInterface;
@@ -20,32 +21,37 @@
 /**
  * @author Christopher Hertel <mail@christopher-hertel.de>
  */
-final readonly class SessionStore implements MessageStoreInterface
+final class SessionStore implements MessageStoreInterface
 {
+    use MessageStoreIdentifierTrait;
+
     private SessionInterface $session;
 
     public function __construct(
         RequestStack $requestStack,
-        private string $sessionKey = 'messages',
+        string $id = '_message_store_session',
     ) {
         if (!class_exists(RequestStack::class)) {
             throw new RuntimeException('For using the SessionStore as message store, the symfony/http-foundation package is required. Try running "composer require symfony/http-foundation".');
         }
+
         $this->session = $requestStack->getSession();
+
+        $this->setId($id);
     }
 
-    public function save(MessageBag $messages): void
+    public function save(MessageBag $messages, ?string $id = null): void
     {
-        $this->session->set($this->sessionKey, $messages);
+        $this->session->set($id ?? $this->getId(), $messages);
     }
 
-    public function load(): MessageBag
+    public function load(?string $id = null): MessageBag
     {
-        return $this->session->get($this->sessionKey, new MessageBag());
+        return $this->session->get($id ?? $this->getId(), new MessageBag());
     }
 
-    public function clear(): void
+    public function clear(?string $id = null): void
     {
-        $this->session->remove($this->sessionKey);
+        $this->session->remove($id ?? $this->getId());
     }
 }
diff --git a/src/agent/src/Chat.php b/src/chat/src/Chat.php
similarity index 66%
rename from src/agent/src/Chat.php
rename to src/chat/src/Chat.php
index 1c594c8b2..a9adcca8a 100644
--- a/src/agent/src/Chat.php
+++ b/src/chat/src/Chat.php
@@ -9,9 +9,10 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Agent;
+namespace Symfony\AI\Chat;
 
-use Symfony\AI\Agent\Chat\MessageStoreInterface;
+use Symfony\AI\Agent\AgentInterface;
+use Symfony\AI\Chat\Exception\LogicException;
 use Symfony\AI\Platform\Message\AssistantMessage;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
@@ -51,4 +52,20 @@ public function submit(UserMessage $message): AssistantMessage
 
         return $assistantMessage;
     }
+
+    public function fork(string $id): ChatInterface
+    {
+        $forkedMessagesBag = $this->store->load($id);
+
+        if (!\array_key_exists(MessageStoreIdentifierTrait::class, class_uses($this->store))) {
+            throw new LogicException(\sprintf('The current store must implement "%s" to being able to be forked.', MessageStoreIdentifierTrait::class));
+        }
+
+        $this->store->setId($id);
+
+        $self = new self($this->agent, $this->store);
+        $self->initiate($forkedMessagesBag);
+
+        return $self;
+    }
 }
diff --git a/src/agent/src/ChatInterface.php b/src/chat/src/ChatInterface.php
similarity index 91%
rename from src/agent/src/ChatInterface.php
rename to src/chat/src/ChatInterface.php
index ba17f92cc..5b98a3715 100644
--- a/src/agent/src/ChatInterface.php
+++ b/src/chat/src/ChatInterface.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Agent;
+namespace Symfony\AI\Chat;
 
 use Symfony\AI\Agent\Exception\ExceptionInterface;
 use Symfony\AI\Platform\Message\AssistantMessage;
@@ -27,4 +27,6 @@ public function initiate(MessageBag $messages): void;
      * @throws ExceptionInterface When the chat submission fails due to agent errors
      */
     public function submit(UserMessage $message): AssistantMessage;
+
+    public function fork(string $id): self;
 }
diff --git a/src/chat/src/Exception/ExceptionInterface.php b/src/chat/src/Exception/ExceptionInterface.php
new file mode 100644
index 000000000..e0763505d
--- /dev/null
+++ b/src/chat/src/Exception/ExceptionInterface.php
@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Chat\Exception;
+
+/**
+ * @author Oskar Stark <oskarstark@googlemail.com>
+ */
+interface ExceptionInterface extends \Throwable
+{
+}
diff --git a/src/chat/src/Exception/InvalidArgumentException.php b/src/chat/src/Exception/InvalidArgumentException.php
new file mode 100644
index 000000000..97dcebab6
--- /dev/null
+++ b/src/chat/src/Exception/InvalidArgumentException.php
@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Chat\Exception;
+
+/**
+ * @author Oskar Stark <oskarstark@googlemail.com>
+ */
+class InvalidArgumentException extends \InvalidArgumentException implements ExceptionInterface
+{
+}
diff --git a/src/chat/src/Exception/LogicException.php b/src/chat/src/Exception/LogicException.php
new file mode 100644
index 000000000..85684959c
--- /dev/null
+++ b/src/chat/src/Exception/LogicException.php
@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Chat\Exception;
+
+/**
+ * @author Oskar Stark <oskarstark@googlemail.com>
+ */
+class LogicException extends \LogicException implements ExceptionInterface
+{
+}
diff --git a/src/chat/src/Exception/RuntimeException.php b/src/chat/src/Exception/RuntimeException.php
new file mode 100644
index 000000000..a6390e279
--- /dev/null
+++ b/src/chat/src/Exception/RuntimeException.php
@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Chat\Exception;
+
+/**
+ * @author Oskar Stark <oskarstark@googlemail.com>
+ */
+class RuntimeException extends \RuntimeException implements ExceptionInterface
+{
+}
diff --git a/src/chat/src/MessageStoreIdentifierTrait.php b/src/chat/src/MessageStoreIdentifierTrait.php
new file mode 100644
index 000000000..b980b364a
--- /dev/null
+++ b/src/chat/src/MessageStoreIdentifierTrait.php
@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Chat;
+
+trait MessageStoreIdentifierTrait
+{
+    private string $id;
+
+    public function setId(string $id): void
+    {
+        $this->id = $id;
+    }
+
+    public function getId(): string
+    {
+        return $this->id;
+    }
+}
diff --git a/src/agent/src/Chat/MessageStoreInterface.php b/src/chat/src/MessageStoreInterface.php
similarity index 50%
rename from src/agent/src/Chat/MessageStoreInterface.php
rename to src/chat/src/MessageStoreInterface.php
index 06651ad97..f8df8f3bd 100644
--- a/src/agent/src/Chat/MessageStoreInterface.php
+++ b/src/chat/src/MessageStoreInterface.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Agent\Chat;
+namespace Symfony\AI\Chat;
 
 use Symfony\AI\Platform\Message\MessageBag;
 
@@ -18,9 +18,12 @@
  */
 interface MessageStoreInterface
 {
-    public function save(MessageBag $messages): void;
+    /**
+     * @param string|null $id If null, the current message bag will be stored under an auto-generated UUID accessible via {@see ChatInterface::getId()}
+     */
+    public function save(MessageBag $messages, ?string $id = null): void;
 
-    public function load(): MessageBag;
+    public function load(?string $id = null): MessageBag;
 
-    public function clear(): void;
+    public function clear(?string $id = null): void;
 }
diff --git a/src/chat/tests/Bridge/Local/CacheStoreTest.php b/src/chat/tests/Bridge/Local/CacheStoreTest.php
new file mode 100644
index 000000000..803ccb539
--- /dev/null
+++ b/src/chat/tests/Bridge/Local/CacheStoreTest.php
@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Chat\Tests\Bridge\Local;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+use Symfony\AI\Chat\Bridge\Local\CacheStore;
+use Symfony\AI\Platform\Message\Message;
+use Symfony\AI\Platform\Message\MessageBag;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+
+#[CoversClass(CacheStore::class)]
+#[UsesClass(MessageBag::class)]
+#[UsesClass(Message::class)]
+final class CacheStoreTest extends TestCase
+{
+    public function testItCanStore()
+    {
+        $messageBag = new MessageBag();
+        $messageBag->add(Message::ofUser('Hello'));
+
+        $store = new CacheStore(new ArrayAdapter());
+        $store->save($messageBag);
+
+        $this->assertCount(1, $store->load('_message_store_cache'));
+    }
+
+    public function testItCanStoreMultipleMessageBags()
+    {
+        $firstMessageBag = new MessageBag();
+        $firstMessageBag->add(Message::ofUser('Hello'));
+
+        $secondMessageBag = new MessageBag();
+        $secondMessageBag->add(Message::ofUser('Hello'));
+        $secondMessageBag->add(Message::ofUser('Hello'));
+
+        $store = new CacheStore(new ArrayAdapter());
+        $store->save($firstMessageBag, 'foo');
+        $store->save($secondMessageBag, 'bar');
+
+        $this->assertCount(1, $store->load('foo'));
+        $this->assertCount(2, $store->load('bar'));
+        $this->assertCount(0, $store->load('_message_store_cache'));
+    }
+
+    public function testItCanClear()
+    {
+        $bag = new MessageBag();
+        $bag->add(Message::ofUser('Hello'));
+        $bag->add(Message::ofUser('Hello'));
+
+        $store = new CacheStore(new ArrayAdapter());
+        $store->save($bag);
+
+        $this->assertCount(2, $store->load('_message_store_cache'));
+
+        $store->clear();
+
+        $this->assertCount(0, $store->load('_message_store_cache'));
+    }
+}
diff --git a/src/chat/tests/Bridge/Local/InMemoryStoreTest.php b/src/chat/tests/Bridge/Local/InMemoryStoreTest.php
new file mode 100644
index 000000000..d023b6417
--- /dev/null
+++ b/src/chat/tests/Bridge/Local/InMemoryStoreTest.php
@@ -0,0 +1,70 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Chat\Tests\Bridge\Local;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+use Symfony\AI\Chat\Bridge\Local\InMemoryStore;
+use Symfony\AI\Platform\Message\Message;
+use Symfony\AI\Platform\Message\MessageBag;
+
+#[CoversClass(InMemoryStore::class)]
+#[UsesClass(MessageBag::class)]
+#[UsesClass(Message::class)]
+final class InMemoryStoreTest extends TestCase
+{
+    public function testItCanStore()
+    {
+        $messageBag = new MessageBag();
+        $messageBag->add(Message::ofUser('Hello'));
+
+        $store = new InMemoryStore();
+        $store->save($messageBag);
+
+        $this->assertCount(1, $store->load('_message_store_memory'));
+    }
+
+    public function testItCanStoreMultipleMessageBags()
+    {
+        $firstMessageBag = new MessageBag();
+        $firstMessageBag->add(Message::ofUser('Hello'));
+
+        $secondMessageBag = new MessageBag();
+        $secondMessageBag->add(Message::ofUser('Hello'));
+        $secondMessageBag->add(Message::ofUser('Hello'));
+
+        $store = new InMemoryStore();
+        $store->save($firstMessageBag, 'foo');
+        $store->save($secondMessageBag, 'bar');
+
+        $this->assertCount(1, $store->load('foo'));
+        $this->assertCount(2, $store->load('bar'));
+        $this->assertCount(0, $store->load('_message_store_memory'));
+    }
+
+    public function testItCanClear()
+    {
+        $bag = new MessageBag();
+        $bag->add(Message::ofUser('Hello'));
+        $bag->add(Message::ofUser('Hello'));
+
+        $store = new InMemoryStore();
+        $store->save($bag);
+
+        $this->assertCount(2, $store->load('_message_store_memory'));
+
+        $store->clear();
+
+        $this->assertCount(0, $store->load('_message_store_memory'));
+    }
+}
diff --git a/src/chat/tests/Bridge/Symfony/SessionStoreTest.php b/src/chat/tests/Bridge/Symfony/SessionStoreTest.php
new file mode 100644
index 000000000..c74bc30cc
--- /dev/null
+++ b/src/chat/tests/Bridge/Symfony/SessionStoreTest.php
@@ -0,0 +1,100 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\AI\Chat\Tests\Bridge\Symfony;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+use Symfony\AI\Chat\Bridge\Symfony\SessionStore;
+use Symfony\AI\Platform\Message\Message;
+use Symfony\AI\Platform\Message\MessageBag;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpFoundation\Session\Session;
+use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
+
+#[CoversClass(SessionStore::class)]
+#[UsesClass(MessageBag::class)]
+#[UsesClass(Message::class)]
+final class SessionStoreTest extends TestCase
+{
+    public function testItCanStore()
+    {
+        $storage = new MockArraySessionStorage();
+        $storage->start();
+
+        $request = Request::create('/');
+        $request->setSession(new Session($storage));
+
+        $requestStack = new RequestStack();
+        $requestStack->push($request);
+
+        $messageBag = new MessageBag();
+        $messageBag->add(Message::ofUser('Hello'));
+
+        $store = new SessionStore($requestStack);
+        $store->save($messageBag);
+
+        $this->assertCount(1, $store->load());
+    }
+
+    public function testItCanStoreMultipleMessageBags()
+    {
+        $storage = new MockArraySessionStorage();
+        $storage->start();
+
+        $request = Request::create('/');
+        $request->setSession(new Session($storage));
+
+        $requestStack = new RequestStack();
+        $requestStack->push($request);
+
+        $firstMessageBag = new MessageBag();
+        $firstMessageBag->add(Message::ofUser('Hello'));
+
+        $secondMessageBag = new MessageBag();
+        $secondMessageBag->add(Message::ofUser('Hello'));
+
+        $store = new SessionStore($requestStack);
+        $store->save($firstMessageBag, 'foo');
+        $store->save($secondMessageBag, 'bar');
+
+        $this->assertCount(1, $store->load('foo'));
+        $this->assertCount(1, $store->load('bar'));
+        $this->assertCount(0, $store->load());
+    }
+
+    public function testItCanClear()
+    {
+        $storage = new MockArraySessionStorage();
+        $storage->start();
+
+        $request = Request::create('/');
+        $request->setSession(new Session($storage));
+
+        $requestStack = new RequestStack();
+        $requestStack->push($request);
+
+        $bag = new MessageBag();
+        $bag->add(Message::ofUser('Hello'));
+        $bag->add(Message::ofUser('Hello'));
+
+        $store = new SessionStore($requestStack);
+        $store->save($bag);
+
+        $this->assertCount(2, $store->load());
+
+        $store->clear();
+
+        $this->assertCount(0, $store->load());
+    }
+}
diff --git a/src/agent/tests/ChatTest.php b/src/chat/tests/ChatTest.php
similarity index 67%
rename from src/agent/tests/ChatTest.php
rename to src/chat/tests/ChatTest.php
index 3cd403eb8..be6f86dc9 100644
--- a/src/agent/tests/ChatTest.php
+++ b/src/chat/tests/ChatTest.php
@@ -9,25 +9,34 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Agent\Tests;
+namespace Symfony\AI\Chat\Tests;
 
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\Small;
 use PHPUnit\Framework\Attributes\UsesClass;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
+use Symfony\AI\Agent\Agent;
 use Symfony\AI\Agent\AgentInterface;
-use Symfony\AI\Agent\Chat;
-use Symfony\AI\Agent\Chat\MessageStoreInterface;
+use Symfony\AI\Chat\Bridge\Local\InMemoryStore;
+use Symfony\AI\Chat\Chat;
+use Symfony\AI\Chat\MessageStoreInterface;
 use Symfony\AI\Platform\Message\AssistantMessage;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
+use Symfony\AI\Platform\Model;
+use Symfony\AI\Platform\PlatformInterface;
+use Symfony\AI\Platform\Result\RawResultInterface;
+use Symfony\AI\Platform\Result\ResultPromise;
 use Symfony\AI\Platform\Result\TextResult;
 
 #[CoversClass(Chat::class)]
+#[UsesClass(Agent::class)]
 #[UsesClass(Message::class)]
 #[UsesClass(MessageBag::class)]
 #[UsesClass(TextResult::class)]
+#[UsesClass(InMemoryStore::class)]
+#[UsesClass(ResultPromise::class)]
 #[Small]
 final class ChatTest extends TestCase
 {
@@ -165,4 +174,65 @@ public function testItHandlesEmptyMessageStore()
         $this->assertInstanceOf(AssistantMessage::class, $result);
         $this->assertSame($assistantContent, $result->content);
     }
+
+    public function testChatCanUseAnotherAgentOnceInitialized()
+    {
+        $rawResult = $this->createStub(RawResultInterface::class);
+
+        $platform = $this->createMock(PlatformInterface::class);
+        $platform->method('invoke')
+            ->willReturn(new ResultPromise(static fn (): TextResult => new TextResult('Assistant response'), $rawResult));
+
+        $model = $this->createMock(Model::class);
+
+        $firstAgent = new Agent($platform, $model);
+
+        $store = new InMemoryStore();
+
+        $chat = new Chat($firstAgent, $store);
+        $chat->submit(Message::ofUser('First message'));
+
+        $this->assertCount(2, $store->load());
+
+        $secondAgent = new Agent($platform, $model);
+        $chat = new Chat($secondAgent, $store);
+        $chat->submit(Message::ofUser('Second message'));
+
+        $this->assertCount(4, $store->load());
+    }
+
+    public function testChatCanBeForked()
+    {
+        $rawResult = $this->createStub(RawResultInterface::class);
+
+        $platform = $this->createMock(PlatformInterface::class);
+        $platform->method('invoke')
+            ->willReturn(new ResultPromise(static fn (): TextResult => new TextResult('Assistant response'), $rawResult));
+
+        $model = $this->createMock(Model::class);
+
+        $firstAgent = new Agent($platform, $model);
+
+        $store = new InMemoryStore();
+
+        $chat = new Chat($firstAgent, $store);
+        $chat->submit(Message::ofUser('First message'));
+
+        $this->assertCount(2, $store->load());
+
+        $forkedChat = $chat->fork('foo');
+        $forkedChat->submit(Message::ofUser('First message'));
+        $forkedChat->submit(Message::ofUser('Second message'));
+
+        $this->assertCount(4, $store->load('foo'));
+        $this->assertCount(2, $store->load('_message_store_memory'));
+
+        $forkedBackChat = $forkedChat->fork('_message_store_memory');
+        $forkedBackChat->submit(Message::ofUser('First message'));
+        $forkedBackChat->submit(Message::ofUser('Second message'));
+        $forkedBackChat->submit(Message::ofUser('Second message'));
+
+        $this->assertCount(4, $store->load('foo'));
+        $this->assertCount(8, $store->load('_message_store_memory'));
+    }
 }