fix(slack): skip block_suggestion payloads instead of wastefully executing workflows

block_suggestion (external select option loading) requires Slack to receive a
synchronous JSON options response within 3 seconds, which this trigger's
async fire-and-forget webhook execution model can never provide. It was
previously routed through the generic interactivity handler like
block_actions/shortcut/view_submission, meaning every keystroke in an
external-select typeahead would silently trigger a full (useless) workflow
execution. Now explicitly skipped via the existing skip mechanism.

Author: waleedlatif1

apps/sim/lib/webhooks/providers/slack.test.ts

@@ -157,6 +157,23 @@ describe('slackHandler formatInput - interactivity (block_actions)', () => {
   })
 })
 
+describe('slackHandler formatInput - block_suggestion', () => {
+  it('skips execution instead of triggering the workflow', async () => {
+    const { input, skip } = await slackHandler.formatInput!(
+      ctx({
+        type: 'block_suggestion',
+        action_id: 'external_select',
+        block_id: 'b1',
+        value: 'sea',
+        team: { id: 'T1' },
+        user: { id: 'U1' },
+      })
+    )
+    expect(input).toBeNull()
+    expect(skip?.message).toBeTruthy()
+  })
+})
+
 describe('slackHandler formatInput - slash commands', () => {
   it('maps flat slash-command form fields', async () => {
     const { input } = await slackHandler.formatInput!(

apps/sim/lib/webhooks/providers/slack.ts

@@ -17,7 +17,8 @@ import type {
 
 const logger = createLogger('WebhookProvider:Slack')
 
-const SLACK_MAX_FILE_SIZE = 50 * 1024 * 1024 // 50 MB
+/** 50 MB */
+const SLACK_MAX_FILE_SIZE = 50 * 1024 * 1024
 const SLACK_MAX_FILES = 15
 
 const SLACK_REACTION_EVENTS = new Set(['reaction_added', 'reaction_removed'])
@@ -27,6 +28,11 @@ const SLACK_REACTION_EVENTS = new Set(['reaction_added', 'reaction_removed'])
  * `payload` field (button clicks, selects, shortcuts, modal submits). These have
  * no Events-API `event` envelope, so they need their own mapping.
  * See https://api.slack.com/interactivity/handling#payloads
+ *
+ * `block_suggestion` (external select option loading) is deliberately excluded:
+ * Slack requires a synchronous JSON `options` response within 3 seconds, which
+ * this trigger's fire-and-forget webhook execution model cannot provide — it is
+ * skipped explicitly in `formatInput` instead of being routed here.
  */
 const SLACK_INTERACTIVE_TYPES = new Set([
   'block_actions',
@@ -35,7 +41,6 @@ const SLACK_INTERACTIVE_TYPES = new Set([
   'shortcut',
   'view_submission',
   'view_closed',
-  'block_suggestion',
 ])
 
 interface SlackDownloadedFile {
@@ -547,6 +552,16 @@ export const slackHandler: WebhookProviderHandler = {
       return { input: { event: formatSlackSlashCommand(b) } }
     }
 
+    if (b?.type === 'block_suggestion') {
+      return {
+        input: null,
+        skip: {
+          message:
+            'Slack block_suggestion payloads require a synchronous options response and cannot be served by an async workflow trigger',
+        },
+      }
+    }
+
     if (
       !b?.event &&
       ((typeof b?.type === 'string' && SLACK_INTERACTIVE_TYPES.has(b.type)) ||