From 1c534f9d5a2318a88378f7b503437554d653fc93 Mon Sep 17 00:00:00 2001
From: Dongbo Wang <dongbow@microsoft.com>
Date: Wed, 9 Jul 2025 11:46:32 -0700
Subject: [PATCH] Fix a null-reference exception bug when built-in tools are
 not available

---
 shell/AIShell.Kernel/MCP/McpManager.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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);
         }