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fix(core): map ROLE.TOOL to "user" for Google, Gemini 3.x rejects role "tool" #145

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fix(core): map ROLE.TOOL to "user" for Google, Gemini 3.x rejects role "tool" #145

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5 changes: 4 additions & 1 deletion datapizza-ai-core/datapizza/type/type.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,10 @@ def google_role(self) -> str:
elif self == ROLE.ASSISTANT or self == ROLE.SYSTEM:
return "model"
elif self == ROLE.TOOL:
return "tool"
# Gemini 3.x rejects the "tool" role with 400 INVALID_ARGUMENT
# ("Role 'tool' is not supported"); function responses must be
# sent as "user" turns, which older models accept as well.
return "user"
else:
raise ValueError(f"Unknown role: {self}")

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