@dataclass(init=False)
class Tool(Generic[AgentDepsT]):
     ...
    def __init__(
        self,
        function: ToolFuncEither[AgentDepsT],
        *,
        takes_ctx: bool | None = None,
        max_retries: int | None = None,
        name: str | None = None,
        description: str | None = None,
        prepare: ToolPrepareFunc[AgentDepsT] | None = None,
        docstring_format: DocstringFormat = 'auto',
        require_parameter_descriptions: bool = False,
        function_schema: _pydantic.FunctionSchema | None = None,
    ):
        f = function_schema or _pydantic.function_schema(
            function, takes_ctx, docstring_format, require_parameter_descriptions
        )
        ...

class Agent(Generic[AgentDepsT, ResultDataT]):
    ...
    def _register_tool(self, tool: Tool[AgentDepsT]) -> None:
        """Private utility to register a tool instance."""
        if tool.max_retries is None:
            # noinspection PyTypeChecker
            tool = dataclasses.replace(tool, max_retries=self._default_retries)