fix(slack): count pipe-form bot mentions as mentioned in ignore gate

The ignore_other_user_mentions gate relied solely on is_mentioned, which
only recognises exact <@UID> markup, so a message mentioning the bot in
pipe form (<@UID|name>) alongside a leading other-user mention was
wrongly suppressed. The gate now also scans for the bot's own mention in
either markup before ignoring a message.

Claude-Session: https://claude.ai/code/session_01TKsNdptNdo9CqT2u7JMdkH

plugins/platforms/slack/adapter.py

@@ -4453,6 +4453,7 @@ class SlackAdapter(BasePlatformAdapter):
             if (
                 self._slack_ignore_other_user_mentions()
                 and not is_mentioned
+                and not self._slack_message_mentions_self(routing_text, self_uids)
                 and self._slack_message_addressed_to_other_user(routing_text, self_uids)
             ):
                 logger.debug(
@@ -6766,6 +6767,21 @@ class SlackAdapter(BasePlatformAdapter):
             return False
         return match.group(1) not in self_uids
 
+    def _slack_message_mentions_self(self, text: str, self_uids: set) -> bool:
+        """Return True when ``text`` @-mentions this bot anywhere in the message.
+
+        Matches both mention markups — ``<@U123>`` and the pipe form
+        ``<@U123|name>`` — so the ignore_other_user_mentions gate treats a
+        pipe-form bot mention as "also mentioned" even though the exact-markup
+        ``is_mentioned`` check only recognises ``<@U123>``.
+        """
+        if not text:
+            return False
+        return any(
+            re.search(rf"<@{re.escape(uid)}(?:\|[^>]*)?>", text)
+            for uid in self_uids
+        )
+
     def _slack_free_response_channels(self) -> set:
         """Return channel IDs where no @mention is required."""
         raw = self.config.extra.get("free_response_channels")

tests/gateway/test_slack_ignore_other_user_mentions.py

@@ -159,6 +159,35 @@ def test_addressed_channel_and_broadcast_tokens_are_not_users():
     assert _addressed("<#C0000000000|general> see here") is False
 
 
+# ---------------------------------------------------------------------------
+# _slack_message_mentions_self()
+# ---------------------------------------------------------------------------
+
+def _mentions_self(text):
+    return _make_adapter()._slack_message_mentions_self(text, SELF_UIDS)
+
+
+def test_mentions_self_plain_form():
+    assert _mentions_self(f"hello <@{BOT_USER_ID}>") is True
+
+
+def test_mentions_self_pipe_form():
+    assert _mentions_self(f"hello <@{BOT_USER_ID}|hermes>") is True
+
+
+def test_mentions_self_other_user_only():
+    assert _mentions_self(f"hello <@{OTHER_USER_ID}|rasha>") is False
+
+
+def test_mentions_self_id_prefix_is_not_a_match():
+    # <@U_BOT_123X> is a different user whose ID merely starts with ours.
+    assert _mentions_self(f"hello <@{BOT_USER_ID}X>") is False
+
+
+def test_mentions_self_empty():
+    assert _mentions_self("") is False
+
+
 # ---------------------------------------------------------------------------
 # Integration: real _handle_slack_message
 # ---------------------------------------------------------------------------
@@ -245,6 +274,24 @@ async def test_free_response_replies_when_bot_also_mentioned(adapter):
     adapter.handle_message.assert_awaited_once()
 
 
+@pytest.mark.asyncio
+async def test_free_response_replies_when_bot_mentioned_in_pipe_form(adapter):
+    """A pipe-form bot mention (``<@U123|name>``) counts as "also mentioned"
+    even though the exact-markup ``is_mentioned`` check misses it."""
+    adapter.config.extra["free_response_channels"] = CHANNEL_ID
+    adapter.config.extra["ignore_other_user_mentions"] = True
+
+    await _run(
+        adapter,
+        _event(
+            f"<@{OTHER_USER_ID}|rasha> and <@{BOT_USER_ID}|hermes> please compare",
+            ts="1700000000.000004",
+        ),
+    )
+
+    adapter.handle_message.assert_awaited_once()
+
+
 @pytest.mark.asyncio
 async def test_mentioned_thread_ignores_followup_addressed_to_other_user(adapter):
     """Ben's case: once the bot has been mentioned in a thread it auto-follows,