feat(chat): add thread.getParticipants()

[bensabic]

• Add thread.getParticipants() method that returns unique human participants in a thread
• Scans message history, deduplicates by user ID, excludes the bot itself
• Includes the current message author even if message history hasn't been fetched yet
• 4 unit tests covering deduplication, bot exclusion, empty threads, and currentMessage inclusion

Use case: subscribe only to 1:1 conversations, unsubscribe when others join so humans can chat without the bot replying to every message.

bot.onNewMention(async (thread) => {
  const participants = await thread.getParticipants();
  if (participants.length === 1) {
    await thread.subscribe();
    await thread.post("I'm here to help!");
  }
});

bot.onSubscribedMessage(async (thread) => {
  const participants = await thread.getParticipants();
  if (participants.length > 1) {
    await thread.unsubscribe();
    return;
  }
  // respond...
});

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Project	Deployment	Actions	Updated (UTC)
chat	Ready	Preview, Comment, Open in v0	Apr 15, 2026 0:42am
chat-sdk-nextjs-chat	Ready	Preview, Comment, Open in v0	Apr 15, 2026 0:42am