import type { AgentMessage } from '@earendil-works/pi-agent-core';
export declare function collectMediaUrisFromValues(values: readonly unknown[]): Set<string>;
export declare function collectMediaUrisFromMessages(messages: readonly AgentMessage[]): Set<string>;
export declare function messagesReferenceMediaUri(messages: readonly AgentMessage[], uri: string): boolean;
/**
 * A media object remains live while any non-deleted session references it,
 * including archived transcripts retained by a reset of that session key.
 */
export declare function isMediaUriReferencedByLiveSession(uri: string): boolean;
export declare function deleteMediaUris(uris: Iterable<string>): Promise<void>;
export declare function deleteMediaUrisNoLongerReferenced(params: {
    removed: readonly AgentMessage[];
    remaining: readonly AgentMessage[];
}): Promise<void>;