Function isDirectedAtAddie

server/src/addie/thread-utils.ts:93–129

(
  messageText: string,
  threadMessages: Array<{ user?: string; ts: string }>,
  currentMessageTs: string,
  currentUserId: string,
  botUserId: string
)

 *   indicating it is addressed to them, not to Addie.
 */
export function isDirectedAtAddie(
  messageText: string,
  threadMessages: Array<{ user?: string; ts: string }>,
  currentMessageTs: string,
  currentUserId: string,
  botUserId: string
): boolean {
  if (/\baddie\b/i.test(messageText)) {
    return true;
  }

  // If the message starts with a Slack @mention of another user, it's addressed to them.
  const startsWithMention = /^<@(U[A-Z0-9]+)>/.exec(messageText.trim());
  if (startsWithMention && startsWithMention[1] !== botUserId) {
    return false;
  }

  // Walk backwards: skip the sender's consecutive messages, then skip Addie's
  // consecutive responses, and check who's underneath. If it's the sender
  // again, Addie was responding to them (back-and-forth). If it's another
  // human, the sender is talking to that person.
  const prior = threadMessages.filter(msg => msg.ts < currentMessageTs && msg.user);
  let i = prior.length - 1;

  while (i >= 0 && prior[i].user === currentUserId) {
    i--;
  }
  while (i >= 0 && prior[i].user === botUserId) {
    i--;
  }

  if (i < 0) {
    return prior.some(msg => msg.user === botUserId);
  }

  return prior[i].user === currentUserId;
}

/**
 * Build compact thread summary lines for the router.