minor #42 (minor) Rename remaining "chain" into "agent" (smnandre)

This PR was merged into the main branch.

Discussion
----------

(minor) Rename remaining "chain" into "agent"

| Q             | A
| ------------- | ---
| Bug fix?      | yes/no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Docs?         |  no <!-- required for new features -->
| Issues        | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

Spotted while playing with the code

(so much to react to in this repo but in a few words: this look very very **very** promising 👏 )

Commits
-------

1714001 (minor) Rename remaining "chain" into "agent"

Author: chr-hertel

demo/src/Wikipedia/Chat.php

@@ -25,7 +25,7 @@ final class Chat
     public function __construct(
         private readonly RequestStack $requestStack,
         #[Autowire(service: 'symfony_ai.agent.wikipedia')]
-        private readonly AgentInterface $chain,
+        private readonly AgentInterface $agent,
     ) {
     }
 
@@ -39,7 +39,7 @@ public function submitMessage(string $message): void
         $messages = $this->loadMessages();
 
         $messages->add(Message::ofUser($message));
-        $response = $this->chain->call($messages);
+        $response = $this->agent->call($messages);
 
         \assert($response instanceof TextResponse);
 

examples/google/toolcall.php

@@ -32,9 +32,9 @@
 
 $toolbox = Toolbox::create(new Clock());
 $processor = new AgentProcessor($toolbox);
-$chain = new Agent($platform, $llm, [$processor], [$processor]);
+$agent = new Agent($platform, $llm, [$processor], [$processor]);
 
 $messages = new MessageBag(Message::ofUser('What time is it?'));
-$response = $chain->call($messages);
+$response = $agent->call($messages);
 
 echo $response->getContent().\PHP_EOL;

src/ai-bundle/src/DependencyInjection/AIExtension.php

@@ -302,8 +302,8 @@ private function processAgentConfig(string $name, array $config, ContainerBuilde
                     // We use the memory factory in case method, description and name are set
                     if (isset($tool['name'], $tool['description'])) {
                         if ($tool['is_agent']) {
-                            $chainWrapperDefinition = new Definition(AgentTool::class, ['$agent' => $reference]);
-                            $container->setDefinition('symfony_ai.toolbox.'.$name.'.agent_wrapper.'.$tool['name'], $chainWrapperDefinition);
+                            $agentWrapperDefinition = new Definition(AgentTool::class, ['$agent' => $reference]);
+                            $container->setDefinition('symfony_ai.toolbox.'.$name.'.agent_wrapper.'.$tool['name'], $agentWrapperDefinition);
                             $reference = new Reference('symfony_ai.toolbox.'.$name.'.agent_wrapper.'.$tool['name']);
                         }
                         $memoryFactoryDefinition->addMethodCall('addTool', [$reference, $tool['name'], $tool['description'], $tool['method'] ?? '__invoke']);