public @NonNull Builder<C> handler(final @NonNull CommandExecutionHandler<C> commandExecutionHandler) {
            return new Builder<>(
                    this.commandManager,
                    this.commandMeta,
                    this.senderType,
                    this.commandComponents,
                    commandExecutionHandler,
                    this.permission,
                    this.flags,
                    this.commandDescription
            );
        }
Specifies the command execution handler.

@param commandExecutionHandler New execution handler
@return new builder instance using the command execution handler
cloud-core/src/main/java/org/incendo/cloud/Command.java