Stream=True incompatible with response_model in Streamlit context

[rpvitruvix]

Similar to issue #1642 but in a Streamlit context.
When using an Agent with both response_model and stream=True, I get:

1. Error: 'tuple' object has no attribute 'content'
2. Warning: Failed to convert response to response_model

My setup uses Claude agents configured with:

• response_model=Article (Pydantic model)
• stream=True
• markdown=True
• debug_mode=True

class Article(BaseModel):
    """Represents a complete article"""
    title: str
    sections: List[Section]
    main_sources: List[Source] = Field(default_factory=list)
    internal_links: List[str] = Field(default_factory=list)

writer_agent = Agent(
    model=Claude(id=CLAUDE_MODEL_ID, api_key=ANTHROPIC_API_KEY),
    team=[planner_agent, researcher_agent, content_agent],
    response_model=Article,
    markdown=True,
    debug_mode=True,
)