/**
 * Message tool action dispatcher.
 * Spec: §4.8 — Tool Schema
 */
export interface MessageToolParams {
    action: "send" | "broadcast" | "read" | "list" | "register" | "sessions";
    /** Recipient — accepts a session ID, session name, or unique prefix of either. */
    to?: string;
    title?: string;
    body?: string;
    labels?: Record<string, string>;
    /** Caller's session ID. Required for actions that record `from`. */
    sessionId?: string;
    /** Caller's session path (relative to `~/.pi/agent/sessions/`). */
    sessionPath?: string;
    projectSlug?: string;
}
export declare function executeMessageTool(params: MessageToolParams): Promise<Record<string, unknown>>;
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