Fix code interpreter tool.

tools/code_interpreter.py

@@ -32,6 +32,7 @@ def execute_code_multilang(code: str, language: str = "python") -> str:
     if language not in supported_languages:
         return f"❌ Unsupported language: {language}. Supported languages are: {', '.join(supported_languages)}"
 
+    interpreter_instance = CodeInterpreter()
     result = interpreter_instance.execute_code(code, language=language)
 
     response = []