minor #728 [Agent] Hardening & Slim down of Agent (chr-hertel)

This PR was merged into the main branch.

Discussion
----------

[Agent] Hardening & Slim down of Agent

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | no
| Issues        |
| License       | MIT

Basically hardening the agent by
* getting rid of public properties in favor of getter/setter
* removing unnecessary error handling
* removing capability checks

Commits
-------

5940dcd Slim down Agent by skipping unnecessary validations and exception handling + introduce getter/setter

Author: chr-hertel

examples/aimlapi/toolcall.php

@@ -24,7 +24,7 @@
 $wikipedia = new Wikipedia(http_client());
 $toolbox = new Toolbox([$wikipedia], logger: logger());
 $processor = new AgentProcessor($toolbox);
-$agent = new Agent($platform, 'google/gemini-2.5-flash', [$processor], [$processor], logger: logger());
+$agent = new Agent($platform, 'google/gemini-2.5-flash', [$processor], [$processor]);
 
 $messages = new MessageBag(Message::ofUser('Who is the current chancellor of Germany?'));
 $result = $agent->call($messages);

examples/anthropic/token-metadata.php

@@ -19,7 +19,7 @@
 
 $platform = PlatformFactory::create(env('ANTHROPIC_API_KEY'), http_client());
 
-$agent = new Agent($platform, 'claude-3-5-sonnet-20241022', outputProcessors: [new TokenOutputProcessor()], logger: logger());
+$agent = new Agent($platform, 'claude-3-5-sonnet-20241022', outputProcessors: [new TokenOutputProcessor()]);
 $messages = new MessageBag(
     Message::forSystem('You are a pirate and you write funny.'),
     Message::ofUser('What is the Symfony framework?'),

examples/anthropic/toolcall.php

@@ -24,7 +24,7 @@
 $wikipedia = new Wikipedia(http_client());
 $toolbox = new Toolbox([$wikipedia], logger: logger());
 $processor = new AgentProcessor($toolbox);
-$agent = new Agent($platform, 'claude-3-5-sonnet-20241022', [$processor], [$processor], logger: logger());
+$agent = new Agent($platform, 'claude-3-5-sonnet-20241022', [$processor], [$processor]);
 
 $messages = new MessageBag(Message::ofUser('Who is the current chancellor of Germany?'));
 $result = $agent->call($messages);

examples/bedrock/toolcall-claude.php

@@ -30,7 +30,7 @@
 $wikipedia = new Wikipedia(http_client());
 $toolbox = new Toolbox([$wikipedia]);
 $processor = new AgentProcessor($toolbox);
-$agent = new Agent($platform, 'claude-3-7-sonnet-20250219', [$processor], [$processor], logger: logger());
+$agent = new Agent($platform, 'claude-3-7-sonnet-20250219', [$processor], [$processor]);
 
 $messages = new MessageBag(Message::ofUser('Who is the current chancellor of Germany?'));
 $result = $agent->call($messages);

examples/bedrock/toolcall-nova.php

@@ -30,7 +30,7 @@
 $wikipedia = new Wikipedia(http_client());
 $toolbox = new Toolbox([$wikipedia]);
 $processor = new AgentProcessor($toolbox);
-$agent = new Agent($platform, 'nova-pro', [$processor], [$processor], logger: logger());
+$agent = new Agent($platform, 'nova-pro', [$processor], [$processor]);
 
 $messages = new MessageBag(
     Message::ofUser('Who is the current chancellor of Germany? Use Wikipedia to find the answer.')

examples/chat/persistent-chat.php

@@ -20,7 +20,7 @@
 
 $platform = PlatformFactory::create(env('OPENAI_API_KEY'), http_client());
 
-$agent = new Agent($platform, 'gpt-4o-mini', logger: logger());
+$agent = new Agent($platform, 'gpt-4o-mini');
 $chat = new Chat($agent, new InMemoryStore());
 
 $messages = new MessageBag(

examples/dockermodelrunner/chat.php

@@ -18,7 +18,7 @@
 
 $platform = PlatformFactory::create(env('DOCKER_MODEL_RUNNER_HOST_URL'), http_client());
 
-$agent = new Agent($platform, 'ai/gemma3n', logger: logger());
+$agent = new Agent($platform, 'ai/gemma3n');
 $messages = new MessageBag(
     Message::forSystem('You are a pirate and you write funny.'),
     Message::ofUser('What is the Symfony framework?'),

examples/dockermodelrunner/toolcall.php

@@ -24,7 +24,7 @@
 $wikipedia = new Wikipedia(http_client());
 $toolbox = new Toolbox([$wikipedia]);
 $processor = new AgentProcessor($toolbox);
-$agent = new Agent($platform, 'ai/gemma3n', [$processor], [$processor], logger: logger());
+$agent = new Agent($platform, 'ai/gemma3n', [$processor], [$processor]);
 
 $messages = new MessageBag(Message::ofUser('Who is the actual Prime Minister of France?'));
 $result = $agent->call($messages);

examples/gemini/server-tools.php

@@ -23,7 +23,7 @@
 
 $toolbox = new Toolbox([new Clock()], logger: logger());
 $processor = new AgentProcessor($toolbox);
-$agent = new Agent($platform, 'gemini-2.5-pro-preview-03-25', [$processor], [$processor], logger: logger());
+$agent = new Agent($platform, 'gemini-2.5-pro-preview-03-25', [$processor], [$processor]);
 
 $messages = new MessageBag(
     Message::ofUser(

examples/gemini/structured-output-clock.php

@@ -27,7 +27,7 @@
 $toolbox = new Toolbox([$clock]);
 $toolProcessor = new ToolProcessor($toolbox);
 $structuredOutputProcessor = new StructuredOutputProcessor();
-$agent = new Agent($platform, 'gemini-1.5-flash', [$toolProcessor, $structuredOutputProcessor], [$toolProcessor, $structuredOutputProcessor], logger: logger());
+$agent = new Agent($platform, 'gemini-1.5-flash', [$toolProcessor, $structuredOutputProcessor], [$toolProcessor, $structuredOutputProcessor]);
 
 $messages = new MessageBag(Message::ofUser('What date and time is it?'));
 $result = $agent->call($messages, ['response_format' => [