export interface GenerateSystemPromptFileOptions {
    /** Root directory generated configs live under. Defaults to
     *  HARNESS_PATHS.generated. Override in tests to avoid the real home dir. */
    generatedRoot?: string;
    /** Defaults to the harness's default profile (DEFAULT_SYSTEM_PROMPT). */
    prompt?: string;
    /**
     * Extra text appended after the prompt, separated by a blank line — today
     * the portable-continue brief (core/rehydration.ts). Kept distinct from
     * `prompt` so a caller that only wants to *add* context doesn't have to
     * re-import and re-compose the default profile (and can't accidentally
     * replace it). Empty/whitespace appendices are ignored.
     */
    appendix?: string;
}
/** Writes `<generated>/<harnessSessionId>/system-prompt.txt`. Returns its
 *  absolute path (LaunchOpts.systemPromptFile). */
export declare function generateSystemPromptFile(harnessSessionId: string, options?: GenerateSystemPromptFileOptions): Promise<string>;
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