Anthropic doesn't support JSON mode object generation.

[Jesscha]

Describe the bug

When using the Twitter plugin with Anthropic's API (Claude), the system fails because Anthropic doesn't support JSON mode object generation. The error message states: "'json-mode object generation' functionality not supported."

To Reproduce

Configure character to use Anthropic/Claude as the model provider

Enable Twitter plugin

Attempt to generate a tweet action
System fails with error about JSON mode not being supported

Expected behavior

The system should fall back to "auto" mode for object generation when using Anthropic/Claude models, since they don't support JSON mode. This would allow the Twitter plugin to work properly with Anthropic models.

[github-actions]

Hello @Jesscha! Welcome to the elizaOS community. Thank you for opening your first issue; we appreciate your contribution. You are now an elizaOS contributor!