diff --git a/app/api/langchain/tool/agent/agentapi.ts b/app/api/langchain/tool/agent/agentapi.ts
index 4e9016b26..71d662cee 100644
--- a/app/api/langchain/tool/agent/agentapi.ts
+++ b/app/api/langchain/tool/agent/agentapi.ts
@@ -467,10 +467,10 @@ export class AgentApi {
       ]);
 
       const lastMessageContent = reqBody.messages.slice(-1)[0].content;
-      // const lastHumanMessage =
-      //   typeof lastMessageContent === "string"
-      //     ? new HumanMessage(lastMessageContent)
-      //     : new HumanMessage({ content: lastMessageContent });
+      const lastHumanMessage =
+        typeof lastMessageContent === "string"
+          ? new HumanMessage(lastMessageContent)
+          : new HumanMessage({ content: lastMessageContent });
       const agent = createToolCallingAgent({
         llm,
         tools,
@@ -484,7 +484,7 @@ export class AgentApi {
       await agentExecutor
         .invoke(
           {
-            input: lastMessageContent,
+            input: lastHumanMessage,
             chat_history: pastMessages,
             signal: this.controller.signal,
           },