import type { AgentMessage } from '@earendil-works/pi-agent-core';
export declare function collectMediaUrisFromMessages(messages: readonly AgentMessage[]): Set<string>;
export declare function messagesReferenceMediaUri(messages: readonly AgentMessage[], 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>;