fix(slack): trust adapter routing after stripping self mention

plugins/platforms/slack/adapter.py

@@ -3936,11 +3936,16 @@ class SlackAdapter(BasePlatformAdapter):
             return ""
         return (
             f"You are connected to this Slack workspace as the bot "
-            f'"@{name}". In messages, each line is prefixed with the sender\'s '
-            f"name, and mentions are shown as @DisplayName. Only treat a "
-            f'message as directed at you when it mentions "@{name}" '
-            f"specifically; a mention of any other participant is not a "
-            f"mention of you, even if their name is similar."
+            f'"@{name}". The Slack adapter already applied authorization, mention, '
+            f"and channel-routing rules before delivering this message. Treat every "
+            f"delivered turn as intentionally routed to you, including a message "
+            f"accepted from a free-response channel or active thread. Your own routing "
+            f'mention "@{name}" may have been removed from the model-visible text. '
+            f"Do not ask for another mention, reject the message, or stay silent solely "
+            f'because "@{name}" is absent. In messages, each line is prefixed with the '
+            f"sender's name, and visible mentions are shown as @DisplayName; a mention "
+            f"of any other participant is not a mention of you, even if their name is "
+            f"similar."
         )
 
     async def _resolve_user_is_bot(

tests/gateway/test_slack.py

@@ -1864,6 +1864,38 @@ class TestMessageRouting:
         assert msg_event.text == "what's the weather?"
         assert "<@U_BOT>" not in msg_event.text
 
+    @pytest.mark.asyncio
+    async def test_accepted_mention_prompt_trusts_adapter_routing(self, adapter):
+        """Cleaned text must not make the model revalidate an accepted mention."""
+        adapter.config.extra.update({"require_mention": True, "strict_mention": True})
+        adapter._bot_display_name = "TestBot"
+        adapter._team_bot_names = {"T123": "WorkspaceBot"}
+        event = {
+            "text": "<@U_BOT> Hi",
+            "user": "U_USER",
+            "channel": "C123",
+            "channel_type": "channel",
+            "team": "T123",
+            "ts": "1234567890.000001",
+        }
+
+        await adapter._handle_slack_message(event)
+
+        adapter.handle_message.assert_awaited_once()
+        msg_event = adapter.handle_message.await_args.args[0]
+        prompt = msg_event.channel_prompt
+        assert msg_event.text == "Hi"
+        assert "@WorkspaceBot" in prompt
+        assert "already applied" in prompt
+        assert "may have been removed" in prompt
+        assert "Do not ask for another mention" in prompt
+        assert "free-response channel or active thread" in prompt
+        assert "not a mention of you" in prompt
+        assert "Only treat a message as directed" not in prompt
+
+    @pytest.mark.asyncio
+
+
 
     @pytest.mark.asyncio
     async def test_allow_bots_mentions_ignores_bot_user_without_current_mention(