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fix: forward reference resolution in Pydantic schema generation. #6104

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copybara-service merged 1 commit into from
Nov 11, 2025
Merged

fix: forward reference resolution in Pydantic schema generation. #6104

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10 changes: 9 additions & 1 deletion vertexai/_genai/_agent_engines_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -590,6 +590,9 @@ def _is_pydantic_serializable(param: inspect.Parameter) -> bool:
if param.annotation == inspect.Parameter.empty:
return True

if "ForwardRef" in repr(param.annotation):
return True

if isinstance(param.annotation, str):
return False

Expand Down Expand Up @@ -641,7 +644,12 @@ def _generate_schema(
name: (
# 1. We infer the argument type here: use Any rather than None so
# it will not try to auto-infer the type based on the default value.
(param.annotation if param.annotation != inspect.Parameter.empty else Any),
(
param.annotation
if param.annotation != inspect.Parameter.empty
and "ForwardRef" not in repr(param.annotation)
else Any
),
pydantic.Field(
# 2. We do not support default values for now.
# default=(
Expand Down
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