/**
 * Slash command implementations for pi-orca-messages.
 * Spec: §4.9 — Slash Commands
 */
/**
 * /messages send <session> — prompt for title/body, send message.
 *
 * `recipient` may be a session UUID, a session name, or a unique prefix of
 * either; ambiguous or unknown inputs return an error string.
 */
export declare function cmdMessageSend(recipient: string, title: string, body: string, fromSessionId: string, projectSlug?: string): Promise<string>;
/**
 * /messages broadcast — prompt for title/body, broadcast to all
 */
export declare function cmdMessageBroadcast(title: string, body: string, fromSessionId: string, projectSlug?: string): Promise<string>;
/**
 * /messages read — read inbox messages
 */
export declare function cmdMessageRead(sessionId: string, projectSlug?: string): Promise<string>;
/**
 * /messages list — list messages with optional filters
 */
export declare function cmdMessageList(from?: string, to?: string, projectSlug?: string): Promise<string>;
/**
 * /messages sessions — list registered sessions
 */
export declare function cmdMessageSessions(projectSlug?: string): Promise<string>;
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