Make server tool http based

engine/app/backend_client.py

@@ -189,3 +189,23 @@ async def search_knowledge_context(
     except Exception as exc:
         logger.warning(f"Knowledge search failed (kb_id={kb_id}): {exc}")
         return []
+
+
+async def fetch_tool_resource(tool_id: str) -> Optional[Dict[str, Any]]:
+    """Fetch tool resource configuration from backend API."""
+    base_url = _backend_base_url()
+    if not base_url or not tool_id:
+        return None
+
+    url = f"{base_url}/api/tools/resources/{tool_id}"
+    try:
+        async with aiohttp.ClientSession(timeout=_timeout()) as session:
+            async with session.get(url) as resp:
+                if resp.status == 404:
+                    return None
+                resp.raise_for_status()
+                data = await resp.json()
+                return data if isinstance(data, dict) else None
+    except Exception as exc:
+        logger.warning(f"Failed to fetch tool resource ({tool_id}): {exc}")
+        return None