diff --git a/src/do_tool/tool_can_use/compare_numbers_tool.py b/src/do_tool/tool_can_use/compare_numbers_tool.py
index ab96eb18..4e4ce96f 100644
--- a/src/do_tool/tool_can_use/compare_numbers_tool.py
+++ b/src/do_tool/tool_can_use/compare_numbers_tool.py
@@ -32,6 +32,8 @@ class CompareNumbersTool(BaseTool):
         try:
             num1 = function_args.get("num1")
             num2 = function_args.get("num2")
+            if not (isinstance(num1, (int, float)) and isinstance(num2, (int, float))):
+                raise ValueError("参数'num1'和'num2'必须为数字")
             lua_code = """
                 function CompareNumbers(a, b)
                     return a .. (a > b and " 大于 " or a < b and " 小于 " or " 等于 ") .. b
diff --git a/src/do_tool/tool_can_use/letter_count_tool.py b/src/do_tool/tool_can_use/letter_count_tool.py
index 999ac53c..9731606a 100644
--- a/src/do_tool/tool_can_use/letter_count_tool.py
+++ b/src/do_tool/tool_can_use/letter_count_tool.py
@@ -36,8 +36,8 @@ class LetterCountTool(BaseTool):
         try:
             word = function_args.get("word")
             letter = function_args.get("letter")
-            if re.match(r"^[a-zA-Z]+$", letter) is None:
-                raise ValueError("请输入英文字母")
+            if re.match(r"^[a-zA-Z]$", letter) is None:
+                raise ValueError("请输入单个英文字母")
             lua_code = """
                 function LetterCount(inputStr, targetLetter)
                     local lower = (inputStr:gsub("[^"..targetLetter:lower().."]", "")):len()