ai-agents-structured-output-li-using-with-structured-output-on-chatgooglegenerati-cd2f93b0

THEN Avoid using List fields in the output schema for Gemini models. Replace List[str] with a single string field (e.g., steps: str) and parse the delimited output manually, or switch to a different LLM provider that supports nested arrays in structured output.

class Plan(BaseModel):
    steps: str = Field(description="comma-separated steps")