diff --git a/backend/app/services/openclaw/admin_service.py b/backend/app/services/openclaw/admin_service.py
index 0456b86..f0d1229 100644
--- a/backend/app/services/openclaw/admin_service.py
+++ b/backend/app/services/openclaw/admin_service.py
@@ -350,11 +350,6 @@ class GatewayAdminLifecycleService(OpenClawDBService):
         )
         try:
             runtime_agents_raw = await openclaw_call("agents.list", config=config)
-            runtime_sessions_raw = await openclaw_call(
-                "sessions.list",
-                {"limit": 500},
-                config=config,
-            )
         except OpenClawGatewayError as exc:
             detail = normalize_gateway_error_message(str(exc))
             raise HTTPException(
@@ -362,18 +357,12 @@ class GatewayAdminLifecycleService(OpenClawDBService):
                 detail=f"Gateway runtime query failed: {detail}",
             ) from exc
 
+        # sessions.list with any non-trivial limit blocks the gateway's Node.js event
+        # loop on large session stores, making the gateway unresponsive.  The fallback
+        # key "agent:{id}:main" is the standard format used for every agent, so omitting
+        # the sessions lookup has no practical effect on matching accuracy.
         runtime_agents = _as_dict_list(runtime_agents_raw)
-        runtime_sessions = _as_dict_list(runtime_sessions_raw)
-
         session_by_agent_key: dict[str, str] = {}
-        for runtime_session in runtime_sessions:
-            key = runtime_session.get("key")
-            if not isinstance(key, str):
-                continue
-            parts = key.split(":")
-            if len(parts) < 2 or parts[0] != "agent":
-                continue
-            session_by_agent_key[parts[1]] = key
 
         existing_agents = await Agent.objects.filter_by(gateway_id=gateway.id).all(self.session)
         existing_by_session_key = {