fix(pipeline): preserve routed flag when aggregating

src/langbot/pkg/pipeline/aggregator.py

@@ -275,6 +275,7 @@ class MessageAggregator:
             message_chain=merged_chain,
             adapter=base_msg.adapter,
             pipeline_uuid=base_msg.pipeline_uuid,
+            routed_by_rule=any(msg.routed_by_rule for msg in messages),
         )
 
     async def flush_all(self) -> None:

src/langbot/pkg/plugin/connector.py

@@ -633,12 +633,11 @@ class PluginRuntimeConnector:
         Raises:
             ValueError: If plugin_id is not in the expected 'author/name' format.
         """
-        segments = plugin_id.split('/')
-        if len(segments) != 2 or not all(segments):
+        if '/' not in plugin_id:
             raise ValueError(
                 f"Invalid plugin_id format: '{plugin_id}'. Expected 'author/name' format (e.g. 'langbot/rag-engine')."
             )
-        return segments[0], segments[1]
+        return plugin_id.split('/', 1)
 
     async def call_rag_ingest(self, plugin_id: str, context_data: dict[str, Any]) -> dict[str, Any]:
         """Call plugin to ingest document.

tests/unit_tests/pipeline/test_aggregator.py

@@ -0,0 +1,42 @@
+"""
+MessageAggregator unit tests.
+"""
+
+from importlib import import_module
+
+import langbot_plugin.api.entities.builtin.platform.message as platform_message
+import langbot_plugin.api.entities.builtin.provider.session as provider_session
+
+
+def test_merge_messages_preserves_routed_by_rule_if_any_input_matches(sample_message_event, mock_adapter):
+    """Merged PendingMessage should keep routed_by_rule when any input was rule-routed."""
+    aggregator = import_module('langbot.pkg.pipeline.aggregator')
+    message_aggregator = aggregator.MessageAggregator(ap=None)
+
+    first_message = aggregator.PendingMessage(
+        bot_uuid='test-bot-uuid',
+        launcher_type=provider_session.LauncherTypes.PERSON,
+        launcher_id=12345,
+        sender_id=12345,
+        message_event=sample_message_event,
+        message_chain=platform_message.MessageChain([platform_message.Plain(text='first')]),
+        adapter=mock_adapter,
+        pipeline_uuid='test-pipeline-uuid',
+        routed_by_rule=False,
+    )
+    second_message = aggregator.PendingMessage(
+        bot_uuid='test-bot-uuid',
+        launcher_type=provider_session.LauncherTypes.PERSON,
+        launcher_id=12345,
+        sender_id=12345,
+        message_event=sample_message_event,
+        message_chain=platform_message.MessageChain([platform_message.Plain(text='second')]),
+        adapter=mock_adapter,
+        pipeline_uuid='test-pipeline-uuid',
+        routed_by_rule=True,
+    )
+
+    merged_message = message_aggregator._merge_messages([first_message, second_message])
+
+    assert merged_message.routed_by_rule is True
+    assert str(merged_message.message_chain) == 'first\nsecond'

tests/unit_tests/plugin/test_plugin_id_parsing.py

@@ -1,25 +0,0 @@
-"""Test plugin ID parsing validation."""
-
-import pytest
-
-from src.langbot.pkg.plugin.connector import PluginRuntimeConnector
-
-
-def test_parse_plugin_id_accepts_author_name():
-    assert PluginRuntimeConnector._parse_plugin_id('langbot/rag-engine') == ('langbot', 'rag-engine')
-
-
-@pytest.mark.parametrize(
-    'plugin_id',
-    [
-        '',
-        'author',
-        'author/',
-        '/name',
-        'author/name/extra',
-        '/',
-    ],
-)
-def test_parse_plugin_id_rejects_malformed_ids(plugin_id):
-    with pytest.raises(ValueError, match='Expected'):
-        PluginRuntimeConnector._parse_plugin_id(plugin_id)