)
            for spec in step.config_specs
        )
        if any(
            s.id.startswith(CONTEXT_CONFIG_PREFIX)
            and s.id.endswith(CONTEXT_CONFIG_SUFFIX_SET)
            for s in specs
        ):
            raise ValueError("RunnableBranch cannot contain context setters.")
        return specs
[docs]    def invoke(
        self, input: Input, config: Optional[RunnableConfig] = None, **kwargs: Any
    ) -> Output:
        """First evaluates the condition, then delegate to true or false branch."""
        config = ensure_config(config)
        callback_manager = get_callback_manager_for_config(config)
        run_manager = callback_manager.on_chain_start(
            dumpd(self),
            input,
            name=config.get("run_name"),
        )
        try:
            for idx, branch in enumerate(self.branches):
                condition, runnable = branch
                expression_value = condition.invoke(
                    input,
                    config=patch_config(
                        config,
                        callbacks=run_manager.get_child(tag=f"condition:{idx + 1}"),
                    ),
                )
                if expression_value:
                    output = runnable.invoke(
                        input,
                        config=patch_config(
                            config,
                            callbacks=run_manager.get_child(tag=f"branch:{idx + 1}"),
                        ),
                        **kwargs,
                    )
                    break
            else:
                output = self.default.invoke(
                    input,
                    config=patch_config(
                        config, callbacks=run_manager.get_child(tag="branch:default")
                    ),
                    **kwargs,
                )
        except Exception as e:
            run_manager.on_chain_error(e)
            raise
        run_manager.on_chain_end(dumpd(output))
        return output
[docs]    async def ainvoke(