fix(trigger): use reactions.get API to fetch message text for thread replies

Author: waleedlatif1

apps/sim/lib/webhooks/utils.server.ts

@@ -682,8 +682,10 @@ async function downloadSlackFiles(
 const SLACK_REACTION_EVENTS = new Set(['reaction_added', 'reaction_removed'])
 
 /**
- * Fetches the text of a message from Slack using conversations.history.
- * Requires the bot token to have channels:history (public) or groups:history (private) scope.
+ * Fetches the text of a reacted-to message from Slack using the reactions.get API.
+ * Unlike conversations.history, reactions.get works for both top-level messages and
+ * thread replies, since it looks up the item directly by channel + timestamp.
+ * Requires the bot token to have the reactions:read scope.
  */
 async function fetchSlackMessageText(
   channel: string,
@@ -693,31 +695,29 @@ async function fetchSlackMessageText(
   try {
     const params = new URLSearchParams({
       channel,
-      oldest: messageTs,
-      latest: messageTs,
-      inclusive: 'true',
-      limit: '1',
+      timestamp: messageTs,
     })
-    const response = await fetch(`https://slack.com/api/conversations.history?${params}`, {
+    const response = await fetch(`https://slack.com/api/reactions.get?${params}`, {
       headers: { Authorization: `Bearer ${botToken}` },
     })
 
     const data = (await response.json()) as {
       ok: boolean
       error?: string
-      messages?: Array<{ text?: string }>
+      type?: string
+      message?: { text?: string }
     }
 
     if (!data.ok) {
-      logger.warn('Slack conversations.history failed — message text unavailable', {
+      logger.warn('Slack reactions.get failed — message text unavailable', {
         channel,
         messageTs,
         error: data.error,
       })
       return ''
     }
 
-    return data.messages?.[0]?.text ?? ''
+    return data.message?.text ?? ''
   } catch (error) {
     logger.warn('Error fetching Slack message text', {
       channel,

apps/sim/triggers/slack/webhook.ts

@@ -67,7 +67,7 @@ export const slackWebhookTrigger: TriggerConfig = {
         'Go to <a href="https://api.slack.com/apps" target="_blank" rel="noopener noreferrer" class="text-muted-foreground underline transition-colors hover:text-muted-foreground/80">Slack Apps page</a>',
         'If you don\'t have an app:<br><ul class="mt-1 ml-5 list-disc"><li>Create an app from scratch</li><li>Give it a name and select your workspace</li></ul>',
         'Go to "Basic Information", find the "Signing Secret", and paste it in the field above.',
-        'Go to "OAuth & Permissions" and add bot token scopes:<br><ul class="mt-1 ml-5 list-disc"><li><code>app_mentions:read</code> - For viewing messages that tag your bot with an @</li><li><code>chat:write</code> - To send messages to channels your bot is a part of</li><li><code>files:read</code> - To access files and images shared in messages</li><li><code>reactions:read</code> - For listening to emoji reactions on messages</li><li><code>channels:history</code> - To read message text when a reaction event fires (public channels)</li><li><code>groups:history</code> - To read message text when a reaction event fires (private channels)</li></ul>',
+        'Go to "OAuth & Permissions" and add bot token scopes:<br><ul class="mt-1 ml-5 list-disc"><li><code>app_mentions:read</code> - For viewing messages that tag your bot with an @</li><li><code>chat:write</code> - To send messages to channels your bot is a part of</li><li><code>files:read</code> - To access files and images shared in messages</li><li><code>reactions:read</code> - For listening to emoji reactions and fetching reacted-to message text</li></ul>',
         'Go to "Event Subscriptions":<br><ul class="mt-1 ml-5 list-disc"><li>Enable events</li><li>Under "Subscribe to Bot Events", add <code>app_mention</code> to listen to messages that mention your bot</li><li>For reaction events, also add <code>reaction_added</code> and/or <code>reaction_removed</code></li><li>Paste the Webhook URL above into the "Request URL" field</li></ul>',
         'Go to "Install App" in the left sidebar and install the app into your desired Slack workspace and channel.',
         'Copy the "Bot User OAuth Token" (starts with <code>xoxb-</code>) and paste it in the Bot Token field above to enable file downloads.',