diff --git a/libs/langchain-mistralai/src/chat_models.ts b/libs/langchain-mistralai/src/chat_models.ts
index 8984ec0d43f6..4d9e1a447fd9 100644
--- a/libs/langchain-mistralai/src/chat_models.ts
+++ b/libs/langchain-mistralai/src/chat_models.ts
@@ -87,7 +87,7 @@ export interface ChatMistralAICallOptions
   response_format?: {
     type: "text" | "json_object";
   };
-  tools: ChatMistralAIToolType[];
+  tools?: ChatMistralAIToolType[];
   tool_choice?: MistralAIToolChoice;
   /**
    * Whether or not to include token usage in the stream.