diff --git a/src/langbot/pkg/api/http/service/provider.py b/src/langbot/pkg/api/http/service/provider.py
index 0a3a1cc75..74647d7ab 100644
--- a/src/langbot/pkg/api/http/service/provider.py
+++ b/src/langbot/pkg/api/http/service/provider.py
@@ -331,8 +331,15 @@ class ModelProviderService:
         embedding_models = await self.ap.embedding_models_service.get_embedding_models_by_provider(
             context, provider_uuid
         )
+        rerank_service = getattr(self.ap, 'rerank_models_service', None)
+        rerank_models = (
+            await rerank_service.get_rerank_models_by_provider(context, provider_uuid)
+            if rerank_service is not None
+            else []
+        )
         existing_llm_names = {model['name'] for model in llm_models}
         existing_embedding_names = {model['name'] for model in embedding_models}
+        existing_rerank_names = {model['name'] for model in rerank_models}
 
         filtered_models = []
         for model in scanned_models:
@@ -359,6 +366,8 @@ class ModelProviderService:
                     'already_added': (
                         model_name in existing_embedding_names
                         if scanned_type == 'embedding'
+                        else model_name in existing_rerank_names
+                        if scanned_type == 'rerank'
                         else model_name in existing_llm_names
                     ),
                 }
diff --git a/src/langbot/pkg/pipeline/process/handlers/command.py b/src/langbot/pkg/pipeline/process/handlers/command.py
index 09fa5379b..03a2ba9e6 100644
--- a/src/langbot/pkg/pipeline/process/handlers/command.py
+++ b/src/langbot/pkg/pipeline/process/handlers/command.py
@@ -1,10 +1,12 @@
 from __future__ import annotations
 import typing
 
+import sqlalchemy
 
 from .. import handler
 from ... import entities
 from ... import plugin_diagnostics
+from ....entity.persistence.bot import BotAdmin
 import langbot_plugin.api.entities.builtin.provider.message as provider_message
 import langbot_plugin.api.entities.builtin.provider.session as provider_session
 import langbot_plugin.api.entities.builtin.pipeline.query as pipeline_query
@@ -24,7 +26,14 @@ class CommandHandler(handler.MessageHandler):
 
         privilege = 1
 
-        if f'{query.launcher_type.value}_{query.launcher_id}' in self.ap.instance_config.data['admins']:
+        admins = await self.ap.persistence_mgr.execute_async(
+            sqlalchemy.select(BotAdmin).where(
+                BotAdmin.bot_uuid == (query.bot_uuid or ''),
+                BotAdmin.launcher_type == query.launcher_type.value,
+                BotAdmin.launcher_id == str(query.launcher_id),
+            )
+        )
+        if admins.first() is not None:
             privilege = 2
 
         spt = command_text.split(' ')
diff --git a/src/langbot/pkg/platform/sources/aiocqhttp.py b/src/langbot/pkg/platform/sources/aiocqhttp.py
index 6fc0ca918..9bee40d6e 100644
--- a/src/langbot/pkg/platform/sources/aiocqhttp.py
+++ b/src/langbot/pkg/platform/sources/aiocqhttp.py
@@ -241,7 +241,11 @@ class AiocqhttpMessageConverter(abstract_platform_adapter.AbstractMessageConvert
         async def process_message_data(msg_data, reply_list):
             if msg_data['type'] == 'image':
                 image_base64, image_format = await image.qq_image_url_to_base64(msg_data['data']['url'])
-                reply_list.append(platform_message.Image(base64=f'data:image/{image_format};base64,{image_base64}'))
+                reply_list.append(
+                    platform_message.Image(
+                        url=msg_data['data']['url'], base64=f'data:image/{image_format};base64,{image_base64}'
+                    )
+                )
 
             elif msg_data['type'] == 'text':
                 reply_list.append(platform_message.Plain(text=msg_data['data']['text']))
@@ -286,7 +290,9 @@ class AiocqhttpMessageConverter(abstract_platform_adapter.AbstractMessageConvert
                     image_msg = platform_message.Face(face_id=face_id, face_name=face_name)
                 else:
                     image_base64, image_format = await image.qq_image_url_to_base64(msg.data['url'])
-                    image_msg = platform_message.Image(base64=f'data:image/{image_format};base64,{image_base64}')
+                    image_msg = platform_message.Image(
+                        url=msg.data['url'], base64=f'data:image/{image_format};base64,{image_base64}'
+                    )
                 yiri_msg_list.append(image_msg)
             elif msg.type == 'forward':
                 # 暂时不太合理
diff --git a/src/langbot/pkg/platform/sources/discord.py b/src/langbot/pkg/platform/sources/discord.py
index 1be977d61..69f349056 100644
--- a/src/langbot/pkg/platform/sources/discord.py
+++ b/src/langbot/pkg/platform/sources/discord.py
@@ -764,7 +764,9 @@ class DiscordMessageConverter(abstract_platform_adapter.AbstractMessageConverter
                 )
                 image_base64 = (await asyncio.to_thread(base64.b64encode, image_data)).decode('utf-8')
                 image_format = response.headers['Content-Type']
-                element_list.append(platform_message.Image(base64=f'data:{image_format};base64,{image_base64}'))
+                element_list.append(
+                    platform_message.Image(url=attachment.url, base64=f'data:{image_format};base64,{image_base64}')
+                )
 
         return platform_message.MessageChain(element_list)
 
diff --git a/src/langbot/pkg/platform/sources/qqofficial.py b/src/langbot/pkg/platform/sources/qqofficial.py
index bd4f97feb..598061f6c 100644
--- a/src/langbot/pkg/platform/sources/qqofficial.py
+++ b/src/langbot/pkg/platform/sources/qqofficial.py
@@ -102,7 +102,7 @@ class QQOfficialMessageConverter(abstract_platform_adapter.AbstractMessageConver
         yiri_msg_list.append(platform_message.Source(id=message_id, time=datetime.datetime.now()))
         if pic_url is not None:
             base64_url = await image.get_qq_official_image_base64(pic_url=pic_url, content_type=content_type)
-            yiri_msg_list.append(platform_message.Image(base64=base64_url))
+            yiri_msg_list.append(platform_message.Image(url=pic_url, base64=base64_url))
 
         yiri_msg_list.append(platform_message.Plain(text=message))
         chain = platform_message.MessageChain(yiri_msg_list)
diff --git a/src/langbot/pkg/platform/sources/slack.py b/src/langbot/pkg/platform/sources/slack.py
index e577e3bdd..df18a0765 100644
--- a/src/langbot/pkg/platform/sources/slack.py
+++ b/src/langbot/pkg/platform/sources/slack.py
@@ -47,7 +47,7 @@ class SlackMessageConverter(abstract_platform_adapter.AbstractMessageConverter):
         yiri_msg_list.append(platform_message.Source(id=message_id, time=datetime.datetime.now()))
         if pic_url is not None:
             base64_url = await image.get_slack_image_to_base64(pic_url=pic_url, bot_token=bot.bot_token)
-            yiri_msg_list.append(platform_message.Image(base64=base64_url))
+            yiri_msg_list.append(platform_message.Image(url=pic_url, base64=base64_url))
 
         yiri_msg_list.append(platform_message.Plain(text=message))
         chain = platform_message.MessageChain(yiri_msg_list)
diff --git a/src/langbot/pkg/platform/sources/telegram.py b/src/langbot/pkg/platform/sources/telegram.py
index 107894094..d24b84eb6 100644
--- a/src/langbot/pkg/platform/sources/telegram.py
+++ b/src/langbot/pkg/platform/sources/telegram.py
@@ -181,7 +181,10 @@ class TelegramMessageConverter(abstract_platform_adapter.AbstractMessageConverte
 
             encoded = await asyncio.to_thread(base64.b64encode, file_bytes)
             message_components.append(
-                platform_message.Image(base64=f'data:{file_format};base64,{encoded.decode("utf-8")}')
+                platform_message.Image(
+                    url=file.file_path,
+                    base64=f'data:{file_format};base64,{encoded.decode("utf-8")}',
+                )
             )
 
         if message.voice:
@@ -889,4 +892,4 @@ class TelegramAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
             await self.logger.info('Telegram adapter stopped')
         self.msg_stream_id.clear()
         self._form_action_titles.clear()
-        return True
+        return True
\ No newline at end of file
diff --git a/src/langbot/pkg/platform/sources/wecom.py b/src/langbot/pkg/platform/sources/wecom.py
index bb8ba2b17..93aaf1f92 100644
--- a/src/langbot/pkg/platform/sources/wecom.py
+++ b/src/langbot/pkg/platform/sources/wecom.py
@@ -133,7 +133,9 @@ class WecomMessageConverter(abstract_platform_adapter.AbstractMessageConverter):
         yiri_msg_list = []
         yiri_msg_list.append(platform_message.Source(id=message_id, time=datetime.datetime.now()))
         image_base64, image_format = await image.get_wecom_image_base64(pic_url=picurl)
-        yiri_msg_list.append(platform_message.Image(base64=f'data:image/{image_format};base64,{image_base64}'))
+        yiri_msg_list.append(
+            platform_message.Image(url=picurl, base64=f'data:image/{image_format};base64,{image_base64}')
+        )
         chain = platform_message.MessageChain(yiri_msg_list)
 
         return chain
diff --git a/src/langbot/pkg/provider/modelmgr/modelmgr.py b/src/langbot/pkg/provider/modelmgr/modelmgr.py
index 925b7de95..73eb65535 100644
--- a/src/langbot/pkg/provider/modelmgr/modelmgr.py
+++ b/src/langbot/pkg/provider/modelmgr/modelmgr.py
@@ -529,6 +529,7 @@ class ModelManager:
             model['uuid']: model
             for model in await self.ap.embedding_models_service.get_embedding_models(context, include_secret=True)
         }
+        existing_rerank_models = {m['uuid']: m for m in await self.ap.rerank_models_service.get_rerank_models()}
 
         created = 0
         updated = 0
@@ -597,6 +598,33 @@ class ModelManager:
                         )
                         updated += 1
 
+            elif space_model.category == 'rerank':
+                existing = existing_rerank_models.get(space_model.uuid)
+                if existing is None:
+                    await self.ap.rerank_models_service.create_rerank_model(
+                        {
+                            'uuid': space_model.uuid,
+                            'name': space_model.model_id,
+                            'provider_uuid': space_model_provider.uuid,
+                            'extra_args': {},
+                            'prefered_ranking': space_model.featured_order,
+                        },
+                        preserve_uuid=True,
+                    )
+                    created += 1
+                elif existing.get('provider_uuid') == space_model_provider.uuid:
+                    desired = {
+                        'name': space_model.model_id,
+                        'provider_uuid': space_model_provider.uuid,
+                        'prefered_ranking': space_model.featured_order,
+                    }
+                    if (
+                        existing.get('name') != desired['name']
+                        or existing.get('prefered_ranking') != desired['prefered_ranking']
+                    ):
+                        await self.ap.rerank_models_service.update_rerank_model(space_model.uuid, dict(desired))
+                        updated += 1
+
         if created or updated:
             self.ap.logger.info(f'Synced models from LangBot Space: {created} added, {updated} updated.')
 
diff --git a/src/langbot/pkg/provider/modelmgr/requesters/litellmchat.py b/src/langbot/pkg/provider/modelmgr/requesters/litellmchat.py
index 982f5609b..f4daaf1df 100644
--- a/src/langbot/pkg/provider/modelmgr/requesters/litellmchat.py
+++ b/src/langbot/pkg/provider/modelmgr/requesters/litellmchat.py
@@ -944,16 +944,21 @@ class LiteLLMRequester(requester.ProviderAPIRequester):
         if api_key:
             headers['Authorization'] = f'Bearer {api_key}'
 
+        request_args = dict(extra_args)
+        rerank_url = request_args.pop('rerank_url', None)
+        rerank_path = request_args.pop('rerank_path', 'rerank')
+
         payload: dict[str, typing.Any] = {
             'model': model_name,
             'query': query,
             'documents': documents,
             'top_n': top_n,
         }
-        if extra_args:
-            payload.update(extra_args)
+        if request_args:
+            payload.update(request_args)
 
-        rerank_url = f'{base_url}/rerank'
+        if not rerank_url:
+            rerank_url = f'{base_url}/{str(rerank_path).strip("/")}'
 
         try:
             async with httpx.AsyncClient(
diff --git a/tests/unit_tests/api/service/test_provider_service.py b/tests/unit_tests/api/service/test_provider_service.py
index 81f5ee6c1..5667ec9fe 100644
--- a/tests/unit_tests/api/service/test_provider_service.py
+++ b/tests/unit_tests/api/service/test_provider_service.py
@@ -833,6 +833,44 @@ class TestModelProviderServiceScanProviderModels:
         assert len(result['models']) == 1
         assert result['models'][0]['type'] == 'llm'
 
+    async def test_scan_provider_marks_existing_rerank_model(self):
+        """Rerank scan results use the rerank service when computing already_added."""
+        ap = SimpleNamespace()
+        ap.persistence_mgr = SimpleNamespace()
+        ap.model_mgr = SimpleNamespace()
+        ap.llm_model_service = SimpleNamespace()
+        ap.embedding_models_service = SimpleNamespace()
+        ap.rerank_models_service = SimpleNamespace()
+
+        provider = _create_mock_provider(provider_uuid='rerank-scan-uuid')
+        ap.persistence_mgr.execute_async = AsyncMock(return_value=_create_mock_result([], first_item=provider))
+        ap.persistence_mgr.serialize_model = Mock(
+            return_value={
+                'uuid': 'rerank-scan-uuid',
+                'name': 'New API',
+                'requester': 'new-api-chat-completions',
+                'base_url': 'https://new-api.example.com/v1',
+                'api_keys': ['key'],
+            }
+        )
+
+        runtime_provider = Mock()
+        runtime_provider.token_mgr.get_token.return_value = 'token'
+        runtime_provider.requester.scan_models = AsyncMock(
+            return_value={'models': [{'id': 'Qwen3-Reranker-8B', 'type': 'rerank'}]}
+        )
+        ap.model_mgr.load_provider = AsyncMock(return_value=runtime_provider)
+        ap.llm_model_service.get_llm_models_by_provider = AsyncMock(return_value=[])
+        ap.embedding_models_service.get_embedding_models_by_provider = AsyncMock(return_value=[])
+        ap.rerank_models_service.get_rerank_models_by_provider = AsyncMock(
+            return_value=[{'name': 'Qwen3-Reranker-8B'}]
+        )
+
+        result = await ModelProviderService(ap).scan_provider_models('rerank-scan-uuid', model_type='rerank')
+
+        assert result['models'][0]['type'] == 'rerank'
+        assert result['models'][0]['already_added'] is True
+
     async def test_scan_provider_not_implemented_raises_error(self):
         """Raises ValueError when scan not implemented."""
         # Setup
diff --git a/tests/unit_tests/api/service/test_space_service.py b/tests/unit_tests/api/service/test_space_service.py
index 6fb74d20b..d92265743 100644
--- a/tests/unit_tests/api/service/test_space_service.py
+++ b/tests/unit_tests/api/service/test_space_service.py
@@ -756,7 +756,7 @@ class TestSpaceServiceGetModels:
                             'uuid': 'uuid-2',
                             'model_id': 'model-2',
                             'provider': 'provider-2',
-                            'category': 'chat',
+                            'category': 'rerank',
                             'status': 'active',
                         },
                     ]
@@ -778,6 +778,7 @@ class TestSpaceServiceGetModels:
 
         # Verify
         assert len(result) == 2
+        assert result[1].category == 'rerank'
 
     async def test_get_models_api_error(self):
         """Raises ValueError on API error."""
diff --git a/tests/unit_tests/pipeline/test_command_handler.py b/tests/unit_tests/pipeline/test_command_handler.py
index 00bd5b681..bc5d39481 100644
--- a/tests/unit_tests/pipeline/test_command_handler.py
+++ b/tests/unit_tests/pipeline/test_command_handler.py
@@ -158,17 +158,21 @@ class TestCommandHandlerReal:
 
     @pytest.mark.asyncio
     async def test_admin_privilege_check(self, fake_app, mock_event_ctx, mock_execute_factory):
-        """Admin users get privilege level 2."""
+        """A per-bot admin from the database is marked as admin in command events."""
         from langbot_plugin.api.entities.builtin.provider.session import LauncherTypes
 
         command = get_command_handler()
 
-        fake_app.instance_config.data = {'admins': ['person_12345']}
+        admin_result = Mock()
+        admin_result.first.return_value = Mock()
+        fake_app.persistence_mgr.execute_async = AsyncMock(return_value=admin_result)
+        fake_app.instance_config.data = {}
         fake_app.plugin_connector.emit_event = AsyncMock(return_value=mock_event_ctx)
         fake_app.cmd_mgr.execute = mock_execute_factory()
 
         handler = command.CommandHandler(fake_app)
         query = command_query('status')
+        query.bot_uuid = 'bot-1'
         query.launcher_type = LauncherTypes.PERSON
         query.launcher_id = 12345
 
@@ -176,23 +180,28 @@ class TestCommandHandlerReal:
         async for result in handler.handle(query):
             results.append(result)
 
+        fake_app.persistence_mgr.execute_async.assert_awaited_once()
         call_args = fake_app.plugin_connector.emit_event.call_args
         event = call_args[0][0]
         assert event.is_admin is True
 
     @pytest.mark.asyncio
     async def test_non_admin_privilege_check(self, fake_app, mock_event_ctx, mock_execute_factory):
-        """Non-admin users get privilege level 1."""
+        """A launcher absent from the per-bot admin table is not an admin."""
         from langbot_plugin.api.entities.builtin.provider.session import LauncherTypes
 
         command = get_command_handler()
 
-        fake_app.instance_config.data = {'admins': ['person_12345']}
+        admin_result = Mock()
+        admin_result.first.return_value = None
+        fake_app.persistence_mgr.execute_async = AsyncMock(return_value=admin_result)
+        fake_app.instance_config.data = {}
         fake_app.plugin_connector.emit_event = AsyncMock(return_value=mock_event_ctx)
         fake_app.cmd_mgr.execute = mock_execute_factory()
 
         handler = command.CommandHandler(fake_app)
         query = command_query('status')
+        query.bot_uuid = 'bot-1'
         query.launcher_type = LauncherTypes.PERSON
         query.launcher_id = 67890
 
@@ -200,6 +209,7 @@ class TestCommandHandlerReal:
         async for result in handler.handle(query):
             results.append(result)
 
+        fake_app.persistence_mgr.execute_async.assert_awaited_once()
         call_args = fake_app.plugin_connector.emit_event.call_args
         event = call_args[0][0]
         assert event.is_admin is False
diff --git a/tests/unit_tests/provider/test_litellmchat.py b/tests/unit_tests/provider/test_litellmchat.py
index a22a589a7..d0332f726 100644
--- a/tests/unit_tests/provider/test_litellmchat.py
+++ b/tests/unit_tests/provider/test_litellmchat.py
@@ -1147,6 +1147,46 @@ class TestInvokeRerank:
         assert results[0]['relevance_score'] == 1.0
         assert results[1]['relevance_score'] == 0.0
 
+    @pytest.mark.asyncio
+    @pytest.mark.parametrize(
+        ('model_extra_args', 'expected_url'),
+        [
+            ({'rerank_path': 'reranks'}, 'https://gateway.example.com/v1/reranks'),
+            ({'rerank_url': 'https://rerank.example.com/api/rerank'}, 'https://rerank.example.com/api/rerank'),
+        ],
+    )
+    async def test_invoke_rerank_openai_compatible_endpoint_override(self, model_extra_args, expected_url):
+        """Endpoint configuration controls routing and is not sent in the Cohere body."""
+        requester = litellmchat.LiteLLMRequester(
+            ap=Mock(),
+            config={
+                'base_url': 'https://gateway.example.com/v1/',
+                'custom_llm_provider': 'openai',
+            },
+        )
+        model = MockRuntimeRerankModel('Qwen3-Reranker-8B', 'test-api-key')
+        model.model_entity.extra_args = model_extra_args
+
+        mock_resp = Mock()
+        mock_resp.raise_for_status = Mock()
+        mock_resp.json = Mock(return_value={'results': [{'index': 0, 'relevance_score': 0.8}]})
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        mock_client.__aenter__ = AsyncMock(return_value=mock_client)
+        mock_client.__aexit__ = AsyncMock(return_value=False)
+
+        with patch('httpx.AsyncClient', return_value=mock_client):
+            await requester.invoke_rerank(model=model, query='query', documents=['document'])
+
+        assert mock_client.post.call_args.args[0] == expected_url
+        payload = mock_client.post.call_args.kwargs['json']
+        assert payload == {
+            'model': 'Qwen3-Reranker-8B',
+            'query': 'query',
+            'documents': ['document'],
+            'top_n': 1,
+        }
+
 
 class TestConvertMessages:
     """Test _convert_messages method"""
diff --git a/tests/unit_tests/provider/test_model_manager.py b/tests/unit_tests/provider/test_model_manager.py
index de343140b..6f288adee 100644
--- a/tests/unit_tests/provider/test_model_manager.py
+++ b/tests/unit_tests/provider/test_model_manager.py
@@ -86,6 +86,48 @@ async def test_model_manager_skips_legacy_space_sync_in_cloud_runtime(mock_app_f
     app.workspace_service.get_local_execution_binding.assert_not_awaited()
 
 
+@pytest.mark.asyncio
+async def test_sync_new_models_from_space_creates_rerank_models(mock_app_for_modelmgr):
+    """Space rerank entries are discovered and persisted under the shared provider."""
+    app = mock_app_for_modelmgr
+    provider = persistence_model.ModelProvider(
+        uuid='space-provider',
+        name='LangBot Space',
+        requester='space-chat-completions',
+        base_url='https://api.langbot.cloud/v1',
+        api_keys=['space-key'],
+    )
+    app.persistence_mgr.execute_async = AsyncMock(return_value=_make_mock_result([provider], first_item=provider))
+    app.space_service.get_models = AsyncMock(
+        return_value=[
+            SimpleNamespace(
+                uuid='rerank-model-uuid',
+                model_id='Qwen3-Reranker-8B',
+                category='rerank',
+                featured_order=10,
+            )
+        ]
+    )
+    app.llm_model_service.get_llm_models = AsyncMock(return_value=[])
+    app.embedding_models_service.get_embedding_models = AsyncMock(return_value=[])
+    app.rerank_models_service = AsyncMock()
+    app.rerank_models_service.get_rerank_models = AsyncMock(return_value=[])
+
+    model_mgr = ModelManager(app)
+    await model_mgr.sync_new_models_from_space()
+
+    app.rerank_models_service.create_rerank_model.assert_awaited_once_with(
+        {
+            'uuid': 'rerank-model-uuid',
+            'name': 'Qwen3-Reranker-8B',
+            'provider_uuid': 'space-provider',
+            'extra_args': {},
+            'prefered_ranking': 10,
+        },
+        preserve_uuid=True,
+    )
+
+
 # ============================================================================
 # Model Loading Tests
 # ============================================================================
@@ -1067,4 +1109,4 @@ def test_provider_not_found_error_str():
     error = provider_errors.ProviderNotFoundError('test-provider')
 
     assert str(error) == 'Provider test-provider not found'
-    assert error.provider_name == 'test-provider'
+    assert error.provider_name == 'test-provider'
\ No newline at end of file