diff --git a/agents-flex-core/src/main/java/com/agentsflex/core/react/ReActMessageBuilder.java b/agents-flex-core/src/main/java/com/agentsflex/core/react/ReActMessageBuilder.java
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index 0000000..c07cb3b
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+++ b/agents-flex-core/src/main/java/com/agentsflex/core/react/ReActMessageBuilder.java
@@ -0,0 +1,105 @@
+/*
+ *  Copyright (c) 2023-2025, Agents-Flex (fuhai999@gmail.com).
+ *  <p>
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *  <p>
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *  <p>
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package com.agentsflex.core.react;
+
+import com.agentsflex.core.llm.functions.Function;
+import com.agentsflex.core.message.HumanMessage;
+import com.agentsflex.core.message.Message;
+
+import java.util.List;
+
+public class ReActMessageBuilder {
+
+
+    /**
+     * 构建 ReAct 开始消息
+     *
+     * @param prompt    提示词
+     * @param functions 函数列表
+     * @param userQuery 用户问题
+     * @return 返回 HumanMessage
+     */
+    public Message buildStartMessage(String prompt, List<Function> functions, String userQuery) {
+        HumanMessage message = new HumanMessage(prompt);
+        message.addMetadata("tools", functions);
+        message.addMetadata("user_input", userQuery);
+        message.addMetadata("type", "reActWrapper");
+        return message;
+    }
+
+
+    /**
+     * 构建 JSON 解析错误消息，用于 json 发送错误时，让 AI 自动修正
+     *
+     * @param e    错误信息
+     * @param step 发送错误的步骤
+     * @return 返回 HumanMessage
+     */
+    public Message buildJsonParserErrorMessage(Exception e, ReActStep step) {
+        String errorMsg = "JSON 解析失败: " + e.getMessage() + ", 原始内容: " + step.getActionInput();
+        String observation = "Action：" + step.getAction() + "\n"
+            + "Action Input：" + step.getActionInput() + "\n"
+            + "Error：" + errorMsg + "\n"
+            + "请检查你的 Action Input 格式是否正确，并纠正 JSON 内容重新生成响应。\n";
+        HumanMessage humanMessage = new HumanMessage(observation + "请继续推理下一步。");
+        humanMessage.addMetadata("type", "reActObservation");
+        return humanMessage;
+    }
+
+    /**
+     * 构建 Observation 消息，让 AI 自动思考
+     *
+     * @param step   步骤
+     * @param result 步骤结果
+     * @return 步骤结果消息
+     */
+    public Message buildObservationMessage(ReActStep step, Object result) {
+        String observation = buildObservationString(step, result);
+        HumanMessage humanMessage = new HumanMessage(observation + "\n请继续推理下一步。");
+        humanMessage.addMetadata("type", "reActObservation");
+        return humanMessage;
+    }
+
+
+    /**
+     * 构建 Observation 字符串
+     *
+     * @param step   步骤
+     * @param result 步骤结果
+     * @return 步骤结果字符串
+     */
+    public static String buildObservationString(ReActStep step, Object result) {
+        return "Action：" + step.getAction() + "\n" +
+            "Action Input：" + step.getActionInput() + "\n" +
+            "Action Result：" + result + "\n";
+    }
+
+    /**
+     * 构建 Action 错误消息，用于 Action 错误时，让 AI 自动修正
+     *
+     * @param step 步骤
+     * @param e    错误信息
+     * @return 错误消息
+     */
+    public Message buildActionErrorMessage(ReActStep step, Exception e) {
+        // 将错误信息反馈给 AI，让其修正
+        String observation = buildObservationString(step, "Error: " + e.getMessage()) + "\n"
+            + "请根据错误信息调整参数并重新尝试。\n";
+        HumanMessage humanMessage = new HumanMessage(observation + "请继续推理下一步。");
+        humanMessage.addMetadata("type", "reActObservation");
+        return humanMessage;
+    }
+}