import type { HarnessDefinition } from './HarnessDefinition';
/**
 * Installs or updates one CLI coding harness globally through npm.
 *
 * A failed installation is reported but never aborts the running command, because the harness check
 * is only an assistant - the command itself may still work with a manually managed harness.
 *
 * Note: `$` is used to indicate that this function is not a pure function - it installs a global npm package
 *
 * @returns `true` when the harness has been installed, `false` when the installation failed
 * @private internal utility of `promptbookCli`
 */
export declare function $installHarness(definition: HarnessDefinition): Promise<boolean>;