Slack: gate interactive reply hints by capability

extensions/slack/src/channel.ts

@@ -29,6 +29,7 @@ import {
   resolveDefaultSlackAccountId,
   resolveSlackAccount,
   resolveSlackReplyToMode,
+  isSlackInteractiveRepliesEnabled,
   resolveSlackGroupRequireMention,
   resolveSlackGroupToolPolicy,
   buildSlackThreadingToolContext,
@@ -147,10 +148,15 @@ export const slackPlugin: ChannelPlugin<ResolvedSlackAccount> = {
     nativeCommands: true,
   },
   agentPrompt: {
-    messageToolHints: () => [
-      "- Slack interactive replies: use `[[slack_buttons: Label:value, Other:other]]` to add action buttons that route clicks back as Slack interaction system events.",
-      "- Slack selects: use `[[slack_select: Placeholder | Label:value, Other:other]]` to add a static select menu that routes the chosen value back as a Slack interaction system event.",
-    ],
+    messageToolHints: ({ cfg, accountId }) =>
+      isSlackInteractiveRepliesEnabled({ cfg, accountId })
+        ? [
+            "- Slack interactive replies: use `[[slack_buttons: Label:value, Other:other]]` to add action buttons that route clicks back as Slack interaction system events.",
+            "- Slack selects: use `[[slack_select: Placeholder | Label:value, Other:other]]` to add a static select menu that routes the chosen value back as a Slack interaction system event.",
+          ]
+        : [
+            "- Slack interactive replies are disabled. If needed, ask to set `channels.slack.capabilities.interactiveReplies=true` (or the same under `channels.slack.accounts.<account>.capabilities`).",
+          ],
   },
   streaming: {
     blockStreamingCoalesceDefaults: { minChars: 1500, idleMs: 1000 },

src/config/schema.help.ts

@@ -1429,6 +1429,8 @@ export const FIELD_HELP: Record<string, string> = {
     "Optional Slack user token for workflows requiring user-context API access beyond bot permissions. Use sparingly and audit scopes because this token can carry broader authority.",
   "channels.slack.userTokenReadOnly":
     "When true, treat configured Slack user token usage as read-only helper behavior where possible. Keep enabled if you only need supplemental reads without user-context writes.",
+  "channels.slack.capabilities.interactiveReplies":
+    "Enable agent-authored Slack interactive reply directives (`[[slack_buttons: ...]]`, `[[slack_select: ...]]`). Default: false.",
   "channels.mattermost.configWrites":
     "Allow Mattermost to write config in response to channel events/commands (default: true).",
   "channels.discord.configWrites":

src/config/schema.labels.ts

@@ -812,6 +812,7 @@ export const FIELD_LABELS: Record<string, string> = {
   "channels.slack.appToken": "Slack App Token",
   "channels.slack.userToken": "Slack User Token",
   "channels.slack.userTokenReadOnly": "Slack User Token Read Only",
+  "channels.slack.capabilities.interactiveReplies": "Slack Interactive Replies",
   "channels.slack.streaming": "Slack Streaming Mode",
   "channels.slack.nativeStreaming": "Slack Native Streaming",
   "channels.slack.streamMode": "Slack Stream Mode (Legacy)",