export function extractToolSend(
  args: Record<string, unknown>,
  expectedAction = "sendMessage",
): { to: string; accountId?: string; threadId?: string } | null {
  const action = typeof args.action === "string" ? args.action.trim() : "";
  if (action !== expectedAction) {
    return null;
  }
  const to = typeof args.to === "string" ? args.to : undefined;
  if (!to) {
    return null;
  }
  const accountId = typeof args.accountId === "string" ? args.accountId.trim() : undefined;
  const threadIdRaw =
    typeof args.threadId === "string"
      ? args.threadId.trim()
      : typeof args.threadId === "number"
        ? String(args.threadId)
        : "";
  const threadId = threadIdRaw.length > 0 ? threadIdRaw : undefined;
  return { to, accountId, threadId };
}