Invalid constructor argument 3 for service "ai.platform.anthropic": argument 2 must be defined before in dev-main

[Krystopher88]

Bug Report

Environment:

• symfony/ai-bundle: dev-main (installed from git on 2025-08-25)
• Symfony: 7.3
• PHP: 8.3
• Platform: Docker with FrankenPHP

Issue:
When configuring Anthropic agents in ai.yaml, the application fails to clear cache and throws a service definition error.

Error Message:
In DefinitionErrorExceptionPass.php line 48:
Invalid constructor argument 3 for service "ai.platform.anthropic": argument 2 must be defined before. Check your service definition.

Configuration Used:

  ai:
      platform:
          anthropic:
              api_key: '%env(ANTHROPIC_API_KEY)%'

      agent:
          blog_generator:
              platform: 'ai.platform.anthropic'
              model:
                  class: 'Symfony\AI\Platform\Bridge\Anthropic\Claude'
                  name: !php/const Symfony\AI\Platform\Bridge\Anthropic\Claude::SONNET_35
              system_prompt: "Tu es un rédacteur web expert."

Steps to Reproduce:

1. Install symfony/ai-bundle from dev-main
2. Configure Anthropic platform with valid API key
3. Configure at least one agent using Anthropic Claude models
4. Run symfony console cache:clear

Expected Behavior:
Cache should clear successfully and Anthropic agents should be available.

Actual Behavior:
Cache clear fails with service definition error related to constructor arguments.

Additional Context:

• Mistral configuration works perfectly with the same setup
• The error suggests an issue with the service definition in the Anthropic bridge
• This prevents using Anthropic agents entirely
• Switching to Mistral platform works as expected

Workaround:
Currently using Mistral as alternative, but Anthropic support is needed for production requirements.

Service Definition Debug:
The error seems to indicate that the ai.platform.anthropic service has incorrect constructor argument ordering or missing dependencies.

Would appreciate guidance on:

1. Is this a known issue with dev-main?
2. Are there specific configuration requirements for Anthropic not documented?
3. Is there a fix or workaround available?

[chr-hertel]

Thanks for that detailed report, made it very easy to reproduce it 👍