/**
 * Session key parsing utilities.
 *
 * Session key format: "agent:{agentId}:{type}:{uuid}" or "agent:{agentId}:{uuid}"
 */
/**
 * Extract agentId from a sessionKey.
 * Returns `undefined` if sessionKey is missing, malformed, or has whitespace-only agentId.
 */
export declare function extractAgentIdFromSessionKey(sessionKey: string | undefined): string | undefined;