MentionHandler

// Handle new mentions (unsubscribed threads only)
chat.onNewMention(async (thread, message) => {
  await thread.subscribe();  // Subscribe to follow-up messages
  await thread.post("Hello! I'll be watching this thread.");
});

// Handle all messages in subscribed threads
chat.onSubscribedMessage(async (thread, message) => {
  if (message.isMention) {
    // User @-mentioned us in a thread we're already watching
    await thread.post("You mentioned me again!");
  }
});

type MentionHandler = (thread: Thread<TState>, message: Message, context: MessageContext) => void | Promise<void>