/** Non-configurable suffix appended by the middleware to every heartbeat prompt. */
export declare const HEARTBEAT_TOOL_SUFFIX = " Report the result using the heartbeat_report tool.";
export declare const DEFAULT_HEARTBEAT_EVERY = "30m";
export declare const DEFAULT_HEARTBEAT_ACK_MAX_CHARS = 300;
/**
 * Resolve the heartbeat prompt from config.
 *
 * Resolution order:
 * - `prompt` takes precedence if set (non-empty after trim)
 * - `file` is read at runtime (path relative to workspaceDir)
 * - Returns empty string when neither is configured (caller should skip heartbeat)
 */
export declare function resolveHeartbeatPrompt(opts: {
    prompt?: string;
    file?: string;
    workspaceDir?: string;
}): Promise<string>;
export type StripHeartbeatMode = "heartbeat" | "message";
export declare function stripHeartbeatToken(raw?: string, opts?: {
    mode?: StripHeartbeatMode;
    maxAckChars?: number;
}): {
    shouldSkip: boolean;
    text: string;
    didStrip: boolean;
};
/**
 * Returns true when the HEARTBEAT.md content is effectively empty —
 * only contains headings, blank lines, and whitespace with no actionable items.
 */
export declare function isHeartbeatContentEffectivelyEmpty(content: string): boolean;
export declare const HEARTBEAT_PROMPT = "";
export declare const DEFAULT_HEARTBEAT_FILENAME = "HEARTBEAT.md";