diff --git a/shell/AIShell.Kernel/MCP/McpManager.cs b/shell/AIShell.Kernel/MCP/McpManager.cs
index 1eef9d3..626bcb7 100644
--- a/shell/AIShell.Kernel/MCP/McpManager.cs
+++ b/shell/AIShell.Kernel/MCP/McpManager.cs
@@ -81,7 +81,7 @@ internal async Task<List<AIFunction>> ListAvailableTools()
         await _initTask;
 
         List<AIFunction> tools = null;
-        if (_builtInTools.Count > 0)
+        if (_builtInTools is { Count: > 0 })
         {
             (tools ??= []).AddRange(_builtInTools.Values);
         }