diff --git a/unraid_mcp/tools/_docker.py b/unraid_mcp/tools/_docker.py
index d698a21..474eab7 100644
--- a/unraid_mcp/tools/_docker.py
+++ b/unraid_mcp/tools/_docker.py
@@ -31,7 +31,10 @@ _DOCKER_MUTATIONS: dict[str, str] = {
     "stop": "mutation StopContainer($id: PrefixedID!) { docker { stop(id: $id) { id names state status } } }",
 }
 
-_DOCKER_SUBACTIONS: set[str] = set(_DOCKER_QUERIES) | set(_DOCKER_MUTATIONS) | {"restart"}
+# "logs" has no GraphQL query (field removed in Unraid 7.2.x) but is still a
+# recognised subaction so validation passes and the informative ToolError below
+# is returned rather than a generic "Invalid action" message.
+_DOCKER_SUBACTIONS: set[str] = set(_DOCKER_QUERIES) | set(_DOCKER_MUTATIONS) | {"restart", "logs"}
 _DOCKER_NEEDS_CONTAINER_ID = {"start", "stop", "details", "restart"}
 _DOCKER_ID_PATTERN = re.compile(r"^[a-f0-9]{64}(:[a-z0-9]+)?$", re.IGNORECASE)
 _DOCKER_SHORT_ID_PATTERN = re.compile(r"^[a-f0-9]{12,63}$", re.IGNORECASE)
@@ -131,6 +134,13 @@ async def _handle_docker(
                     return dict(net)
             raise ToolError(f"Network '{network_id}' not found.")
 
+        if subaction == "logs":
+            raise ToolError(
+                "Container logs are not available via the Unraid GraphQL API. "
+                "Use the Unraid terminal or SSH to run: "
+                f"`docker logs {container_id or '<container_id>'} --tail 100`"
+            )
+
         if subaction == "restart":
             actual_id = await _resolve_container_id(container_id or "", strict=True)
             stop_data = await _client.make_graphql_request(
diff --git a/unraid_mcp/tools/_system.py b/unraid_mcp/tools/_system.py
index 18ef4a9..5610b52 100644
--- a/unraid_mcp/tools/_system.py
+++ b/unraid_mcp/tools/_system.py
@@ -43,6 +43,8 @@ _SYSTEM_QUERIES: dict[str, str] = {
           }
         }
     """,
+    # Uses the vars root field — returns only the network-access subset
+    # (port, portssl, localTld, useSsl) alongside servers for URL construction.
     "network": """
         query GetNetworkInfo {
           servers { id name status wanip lanip localurl remoteurl }
@@ -54,6 +56,9 @@ _SYSTEM_QUERIES: dict[str, str] = {
           registration { id type keyFile { location } state expiration updateExpiration }
         }
     """,
+    # Uses the vars root field — returns a broad subset of system variables.
+    # Shares the same GraphQL root as "network" but requests a different field
+    # set; no overlap occurs because GraphQL returns only the requested subfields.
     "variables": """
         query GetSelectiveUnraidVariables {
           vars {
@@ -206,7 +211,19 @@ async def _handle_system(subaction: str, device_id: str | None) -> dict[str, Any
             values = settings["unified"].get("values") or {}
             return dict(values) if isinstance(values, dict) else {"raw": values}
         if subaction == "server":
-            return data
+            info = data.get("info") or {}
+            summary: dict[str, Any] = {}
+            if info.get("os"):
+                summary["hostname"] = info["os"].get("hostname")
+                summary["uptime"] = info["os"].get("uptime")
+            if info.get("versions") and info["versions"].get("core"):
+                summary["unraid_version"] = info["versions"]["core"].get("unraid")
+            summary["machine_id"] = info.get("machineId")
+            summary["time"] = info.get("time")
+            array = data.get("array") or {}
+            summary["array_state"] = array.get("state")
+            summary["online"] = data.get("online")
+            return summary
         if subaction == "network":
             servers_data = data.get("servers") or []
             vars_data = data.get("vars") or {}