fix: preserve MCP server ids with slashes

Fixes #2301

tests/unit_tests/api/service/test_mcp_service.py

@@ -280,6 +280,25 @@ class TestMCPServiceCreateMCPServer:
         assert server_uuid is not None
         assert len(server_uuid) == 36  # UUID format
 
+    async def test_create_mcp_server_duplicate_name_raises(self):
+        """Rejects duplicate MCP server names."""
+        # Setup
+        ap = SimpleNamespace()
+        ap.persistence_mgr = SimpleNamespace()
+        ap.instance_config = SimpleNamespace()
+        ap.instance_config.data = {'system': {'limitation': {'max_extensions': -1}}}
+        ap.tool_mgr = None
+
+        existing_server = _create_mock_mcp_server(name='Existing Server')
+        ap.persistence_mgr.execute_async = AsyncMock(return_value=_create_mock_result(first_item=existing_server))
+        ap.persistence_mgr.serialize_model = Mock(return_value={})
+
+        service = MCPService(ap)
+
+        # Execute & Verify
+        with pytest.raises(ValueError, match='MCP server already exists: Existing Server'):
+            await service.create_mcp_server({'name': 'Existing Server'})
+
     async def test_create_mcp_server_loads_server(self):
         """Loads server into tool_mgr when enabled."""
         # Setup
@@ -301,7 +320,7 @@ class TestMCPServiceCreateMCPServer:
             nonlocal call_count
             call_count += 1
             if call_count == 1:
-                return _create_mock_result([])  # Empty list for limit check
+                return _create_mock_result([])  # Empty result for duplicate-name check
             elif call_count == 2:
                 return Mock()  # Insert
             return _create_mock_result(first_item=server_entity)  # Select created

tests/unit_tests/api/test_mcp_controller.py

@@ -0,0 +1,76 @@
+from __future__ import annotations
+
+import sys
+import types
+from importlib import import_module
+from types import SimpleNamespace
+from unittest.mock import AsyncMock
+
+import pytest
+import quart
+
+core_app_module = types.ModuleType('langbot.pkg.core.app')
+core_app_module.Application = object
+sys.modules.setdefault('langbot.pkg.core.app', core_app_module)
+
+
+pytestmark = pytest.mark.asyncio
+
+
+async def _create_test_client(mcp_service: SimpleNamespace):
+    app = quart.Quart(__name__)
+    user_service = SimpleNamespace(
+        verify_jwt_token=AsyncMock(return_value='test@example.com'),
+        get_user_by_email=AsyncMock(return_value=SimpleNamespace(user='test@example.com')),
+    )
+    ap = SimpleNamespace(mcp_service=mcp_service, user_service=user_service)
+    MCPRouterGroup = import_module('langbot.pkg.api.http.controller.groups.resources.mcp').MCPRouterGroup
+    group = MCPRouterGroup(ap, app)
+    await group.initialize()
+    return app.test_client()
+
+
+async def test_mcp_server_route_accepts_encoded_slash_name():
+    mcp_service = SimpleNamespace(
+        get_mcp_server_by_name=AsyncMock(
+            return_value={
+                'uuid': 'test-uuid',
+                'name': 'pab1it0/prometheus',
+                'enable': True,
+                'mode': 'stdio',
+                'extra_args': {},
+            }
+        )
+    )
+    client = await _create_test_client(mcp_service)
+
+    response = await client.get(
+        '/api/v1/mcp/servers/pab1it0%2Fprometheus',
+        headers={'Authorization': 'Bearer test-token'},
+    )
+
+    assert response.status_code == 200
+    mcp_service.get_mcp_server_by_name.assert_awaited_once_with('pab1it0/prometheus')
+    payload = await response.get_json()
+    assert payload['data']['server']['name'] == 'pab1it0/prometheus'
+
+
+async def test_mcp_resource_route_accepts_encoded_slash_name():
+    mcp_service = SimpleNamespace(
+        get_mcp_server_by_name=AsyncMock(),
+        get_mcp_server_resources=AsyncMock(return_value=[]),
+        get_mcp_server_resource_templates=AsyncMock(return_value=[]),
+        get_runtime_info=AsyncMock(return_value={'resource_capabilities': {'subscribe': False}}),
+    )
+    client = await _create_test_client(mcp_service)
+
+    response = await client.get(
+        '/api/v1/mcp/servers/pab1it0%2Fprometheus/resources',
+        headers={'Authorization': 'Bearer test-token'},
+    )
+
+    assert response.status_code == 200
+    mcp_service.get_mcp_server_by_name.assert_not_awaited()
+    mcp_service.get_mcp_server_resources.assert_awaited_once_with('pab1it0/prometheus')
+    payload = await response.get_json()
+    assert payload['data']['resource_capabilities'] == {'subscribe': False}