export type PromptCategory = "create" | "edit" | "summarize" | "analyze" | "question" | "other";
export interface SafePromptMetadata {
    prompt_category: PromptCategory;
    prompt_length_bucket: string;
    prompt_hash?: string;
}
/**
 * Derives coarse prompt metadata without returning or persisting the prompt.
 * The HMAC key stays in tab-local sessionStorage and rotates with the analytics
 * session, so prompt hashes cannot be joined across browser sessions.
 */
export declare function summarizePrompt(prompt: string): Omit<SafePromptMetadata, "prompt_hash">;
export declare function buildSafePromptHash(prompt: string): Promise<string | undefined>;
export declare function buildSafePromptMetadata(prompt: string): Promise<SafePromptMetadata>;