diff --git a/app/nodes.py b/app/nodes.py
index a009bce..504081d 100644
--- a/app/nodes.py
+++ b/app/nodes.py
@@ -16,7 +16,6 @@ from urllib.parse import urlparse
 
 import yaml
 from fastapi import APIRouter, HTTPException
-from fastapi.responses import StreamingResponse
 
 logger = logging.getLogger(__name__)
 
@@ -98,7 +97,7 @@ def _get_ollama_url(node_id: str) -> str:
             return f"{parsed.scheme}://{parsed.hostname}:11434"
     raise HTTPException(
         status_code=404,
-        detail=f"Cannot determine Ollama URL for node {node_id} — no agent_url in profile",
+        detail=f"Cannot determine Ollama URL for node {node_id}: no agent_url in profile",
     )
 
 
diff --git a/tests/test_nodes.py b/tests/test_nodes.py
index b55a146..2022307 100644
--- a/tests/test_nodes.py
+++ b/tests/test_nodes.py
@@ -1,9 +1,7 @@
 """Tests for app/nodes.py — /api/nodes-mgmt/* endpoints."""
 from __future__ import annotations
 
-import os
 from pathlib import Path
-from unittest.mock import MagicMock, patch
 
 import pytest
 import yaml