/**
 * AI-powered image relevance filter for Pixabay search results.
 *
 * Uses Gemini to evaluate whether images (based on tags/metadata)
 * genuinely represent a target activity, filtering out:
 * - Tangential keyword matches (coral necklace when searching "jewelry making")
 * - Cultural/documentary photos instead of activity photos
 * - Objects without activity context (a nut tagged with "jewelry making")
 * - Model photos where the activity is incidental (portrait with jewelry)
 */
/**
 * Image candidate from Pixabay search results.
 */
export interface PixabayImageCandidate {
    /** Unique identifier (Pixabay ID) */
    readonly id: number;
    /** Comma-separated tags from Pixabay */
    readonly tags: string;
}
/**
 * Result of AI filtering - images that match the activity.
 */
export interface PixabayImageMatch {
    /** Pixabay image ID */
    readonly id: number;
    /** Confidence score 0-100 */
    readonly confidence: number;
}
/**
 * Filter a batch of Pixabay image candidates for relevance to a target activity.
 * Returns only matching images with confidence scores.
 *
 * @param activity - The activity being searched for (e.g., "swimming", "sushi")
 * @param candidates - Pixabay search results with tags
 * @param apiKey - Google AI API key (Gemini)
 * @returns Matching images sorted by confidence (highest first)
 */
export declare function filterPixabayImages(activity: string, candidates: readonly PixabayImageCandidate[], apiKey: string): Promise<PixabayImageMatch[]>;
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