FunctionTool does not use the proper function name

[Pierrolo]

In FunctionTool init, when calling the function args_base_model_from_signature is does not return the name of the function, but the name of the last input. See below the current implementation of this function (from file python/packages/autogen-core/src/autogen_core/_function_utils.py) :

def args_base_model_from_signature(name: str, sig: inspect.Signature) -> Type[BaseModel]:
    fields: Dict[str, tuple[Type[Any], Any]] = {}
    for name, param in sig.parameters.items():
        # This is handled externally
        if name == "cancellation_token":
            continue

        if param.annotation is inspect.Parameter.empty:
            raise ValueError("No annotation")

        type = normalize_annotated_type(param.annotation)
        description = type2description(name, param.annotation)
        default_value = param.default if param.default is not inspect.Parameter.empty else PydanticUndefined

        fields[name] = (type, Field(default=default_value, description=description))

    return cast(BaseModel, create_model(name, **fields))  # type: ignore

In it, the param name is overwritten in the for loot. A correct implementation could look like :

def args_base_model_from_signature(name: str, sig: inspect.Signature) -> Type[BaseModel]:
    fields: Dict[str, tuple[Type[Any], Any]] = {}
    for param_name, param in sig.parameters.items():
        # This is handled externally
        if param_name == "cancellation_token":
            continue

        if param.annotation is inspect.Parameter.empty:
            raise ValueError("No annotation")

        type = normalize_annotated_type(param.annotation)
        description = type2description(name, param.annotation)
        default_value = param.default if param.default is not inspect.Parameter.empty else PydanticUndefined

        fields[param_name] = (type, Field(default=default_value, description=description))

    return cast(BaseModel, create_model(name, **fields))  # type: ignore