import type { CanonConversation, CanonGroupContext, CanonGroupContextMode, CanonKnownRecentParticipant, CanonMembershipChange, CanonMessage } from './types.js';
type MessageLike = {
    senderId?: string | null;
    senderName?: string | null;
    senderType?: CanonMessage['senderType'];
    isOwner?: boolean;
    createdAt?: string | null;
};
export declare function diffCanonMemberIds(previousMemberIds: unknown[], nextMemberIds: unknown[]): CanonMembershipChange | null;
export declare function buildCanonKnownRecentParticipants(input: {
    messages: MessageLike[];
    agentId: string;
    ownerId?: string | null;
    maxParticipants?: number;
}): CanonKnownRecentParticipant[];
export declare function buildCanonGroupContext(input: {
    conversation: CanonConversation | null | undefined;
    messages: MessageLike[];
    agentId: string;
    ownerId?: string | null;
    ownerName?: string | null;
    membershipChange?: CanonMembershipChange | null;
}): CanonGroupContext | undefined;
export declare function buildCompactGroupContextLines(groupContext: CanonGroupContext, mode: CanonGroupContextMode): string[];
export {};