destination_chains: Mapping[str, Chain]
    """Chains that return final answer to inputs."""
    default_chain: Chain
    """Default chain to use when none of the destination chains are suitable."""
    silent_errors: bool = False
    """If True, use default_chain when an invalid destination name is provided. 
    Defaults to False."""
    class Config:
        """Configuration for this pydantic object."""
        extra = Extra.forbid
        arbitrary_types_allowed = True
    @property
    def input_keys(self) -> List[str]:
        """Will be whatever keys the router chain prompt expects.
        :meta private:
        """
        return self.router_chain.input_keys
    @property
    def output_keys(self) -> List[str]:
        """Will always return text key.
        :meta private:
        """
        return []
    def _call(
        self,
        inputs: Dict[str, Any],
        run_manager: Optional[CallbackManagerForChainRun] = None,
    ) -> Dict[str, Any]:
        _run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
        callbacks = _run_manager.get_child()
        route = self.router_chain.route(inputs, callbacks=callbacks)
        _run_manager.on_text(
            str(route.destination) + ": " + str(route.next_inputs), verbose=self.verbose
        )
        if not route.destination:
            return self.default_chain(route.next_inputs, callbacks=callbacks)
        elif route.destination in self.destination_chains:
            return self.destination_chains[route.destination](
                route.next_inputs, callbacks=callbacks
            )
        elif self.silent_errors:
            return self.default_chain(route.next_inputs, callbacks=callbacks)
        else:
            raise ValueError(