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Serialize dict and list tool results as JSON in return_value_as_string #7873

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Serialize dict and list tool results as JSON in return_value_as_string #7873

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10 changes: 10 additions & 0 deletions python/packages/autogen-core/src/autogen_core/tools/_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,16 @@ def return_value_as_string(self, value: Any) -> str:
return json.dumps(dumped)
return str(dumped)

if isinstance(value, (dict, list)):
# Serialize structured return values as valid JSON instead of their
# Python repr (e.g. ``str``) so downstream consumers receive
# double-quoted JSON rather than single-quoted repr strings. Fall
# back to ``str`` for values that are not JSON serializable.
try:
return json.dumps(value)
except (TypeError, ValueError):
return str(value)

return str(value)

@abstractmethod
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