improvement(slack): request the approved mention/assistant/DM scopes, advertised on v2 only (#5898)

Slack app review has since approved `app_mentions:read`, `assistant:write`, and
`im:history` — they are live in the prod app manifest's `oauth_config.scopes.bot`
— but the repo still had them commented out behind a stale "re-add once approved"
TODO. Sim was therefore requesting a narrower grant than the app is entitled to,
so newly connected accounts got tokens missing exactly the scopes backing three
`simSubscribed` events on the native Sim app trigger: `app_mention`
(app_mentions:read), assistant threads (assistant:write), and DMs (im:history).

The requested scope set now matches the manifest's 20 approved bot scopes exactly.

Scopes are per-credential, not per-block (one Slack app -> one `slack` provider ->
one shared token, requested server-side via getCanonicalScopesForProvider), so the
grant itself cannot be scoped to v2. What is per-block is what each picker
advertises and treats as missing, so:

- slack_v2 + the slack_oauth trigger advertise the full set (they host the native
  Sim app trigger that needs it).
- The legacy v1 block stays pinned to the pre-expansion 17 scopes. It has no
  feature needing the new three, and advertising them there would flag every
  existing Slack credential as missing scopes and prompt a needless reconnect.


Claude-Session: https://claude.ai/code/session_018asmKsWQ5Vi7T7wD9uHofz

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/sim/blocks/blocks/slack.ts

@@ -7,6 +7,25 @@ import { normalizeFileInput } from '@/blocks/utils'
 import type { SlackResponse } from '@/tools/slack/types'
 import { getTrigger } from '@/triggers'
 
+/**
+ * Scopes added for the native Sim Slack app trigger (`slack_oauth`): the shared
+ * app's `app_mention`, assistant-thread, and DM events don't deliver without
+ * them. Advertised by `slack_v2` and the trigger only — the legacy block has no
+ * feature that needs them, and listing them there would flag every existing
+ * Slack credential as missing scopes and prompt a reconnect.
+ *
+ * This only controls what each picker *advertises* and treats as missing. The
+ * authorization request itself is provider-wide
+ * (`getCanonicalScopesForProvider('slack')`), so any reconnect grants the full
+ * set regardless of which block started it.
+ */
+const SLACK_V2_ONLY_SCOPES = new Set(['app_mentions:read', 'assistant:write', 'im:history'])
+
+/** Slack scopes the legacy v1 block advertises — the set from before the trigger expansion. */
+const SLACK_V1_ADVERTISED_SCOPES = getScopesForService('slack').filter(
+  (scope) => !SLACK_V2_ONLY_SCOPES.has(scope)
+)
+
 export const SlackBlock: BlockConfig<SlackResponse> = {
   type: 'slack',
   name: 'Slack',
@@ -107,7 +126,7 @@ export const SlackBlock: BlockConfig<SlackResponse> = {
       canonicalParamId: 'oauthCredential',
       mode: 'basic',
       serviceId: 'slack',
-      requiredScopes: getScopesForService('slack'),
+      requiredScopes: SLACK_V1_ADVERTISED_SCOPES,
       placeholder: 'Select Slack workspace',
       dependsOn: ['authMethod'],
       condition: {
@@ -2642,6 +2661,9 @@ function adaptSubBlockForV2(sb: SubBlockConfig): SubBlockConfig {
       ...rest,
       credentialKind: 'any',
       placeholder: 'Select Slack account or bot',
+      // Full set, unlike v1: v2 hosts the native Sim app trigger, whose events
+      // need the mention/assistant/DM scopes.
+      requiredScopes: getScopesForService('slack'),
       credentialLabels: {
         oauthGroup: 'Sim app',
         oauthConnect: 'Connect the Sim app',

apps/sim/lib/oauth/oauth.ts

@@ -782,12 +782,9 @@ export const OAUTH_PROVIDERS: Record<string, OAuthProviderConfig> = {
           'groups:write',
           'chat:write',
           'chat:write.public',
-          // TODO: Re-add once Slack app review approves these. Requesting a scope
-          // the app is not yet approved for makes Slack reject the entire
-          // authorization with "unapproved permissions requested", breaking connect.
-          // 'assistant:write',
-          // 'app_mentions:read',
-          // 'im:history',
+          'assistant:write',
+          'app_mentions:read',
+          'im:history',
           'im:write',
           'im:read',
           'users:read',