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Description
In the tutorial on Agent Team, I discovered a condition :
if event.content and event.content.parts. The class definition of google.genai.Content is as follows (as of 20 June 2025 IST):
class Content(_common.BaseModel):
"""Contains the multi-part content of a message."""
parts: Optional[list[Part]] = Field(
default=None,
description="""List of parts that constitute a single message. Each part may have
a different IANA MIME type.""",
)
role: Optional[str] = Field(
default=None,
description="""Optional. The producer of the content. Must be either 'user' or
'model'. Useful to set for multi-turn conversations, otherwise can be
empty. If role is not specified, SDK will determine the role.""",
)There is not a separate validation, but it is safe to assume that there will not be any response which has a role, but no parts.
Now even if you do encounter a possibility where out of user or model (as role field) , only role is set, then is not it a vague design from the genai repo? I mean there is a role but empty list as output. Do you think a model_after_validator is required either in event, or in google.genai.types.Content?