diff --git a/agents-flex-core/src/main/java/com/agentsflex/core/prompt/DefaultPromptFormat.java b/agents-flex-core/src/main/java/com/agentsflex/core/prompt/DefaultPromptFormat.java
new file mode 100644
index 0000000..529831e
--- /dev/null
+++ b/agents-flex-core/src/main/java/com/agentsflex/core/prompt/DefaultPromptFormat.java
@@ -0,0 +1,162 @@
+/*
+ *  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.prompt;
+
+import com.agentsflex.core.llm.functions.Function;
+import com.agentsflex.core.llm.functions.Parameter;
+import com.agentsflex.core.message.*;
+import com.agentsflex.core.util.Maps;
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.serializer.SerializerFeature;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class DefaultPromptFormat implements PromptFormat {
+
+    @Override
+    public Object toMessagesJsonObject(List<Message> messages) {
+        if (messages == null || messages.isEmpty()) {
+            return null;
+        }
+
+        List<Map<String, Object>> messageJsonArray = new ArrayList<>(messages.size());
+        buildMessageJsonArray(messageJsonArray, messages);
+
+        return messageJsonArray;
+    }
+
+    protected void buildMessageJsonArray(List<Map<String, Object>> messageJsonArray, List<Message> messages) {
+        messages.forEach(message -> {
+            Map<String, Object> map = new HashMap<>(2);
+            if (message instanceof HumanMessage) {
+                map.put("role", "user");
+            } else if (message instanceof AiMessage) {
+                map.put("role", "assistant");
+                AiMessage aiMessage = (AiMessage) message;
+                List<FunctionCall> calls = aiMessage.getCalls();
+                if (calls != null && !calls.isEmpty()) {
+                    map.put("content", ""); // 清空 content，在某模型下，会把思考的部分当做 content 的部分
+                    buildToolCalls(map, calls);
+                    //不需要 build content 了
+                    messageJsonArray.add(map);
+                    return;
+                }
+            } else if (message instanceof SystemMessage) {
+                map.put("role", "system");
+            } else if (message instanceof ToolMessage) {
+                map.put("role", "tool");
+                map.put("tool_call_id", ((ToolMessage) message).getToolCallId());
+            }
+            buildMessageContent(message, map);
+            messageJsonArray.add(map);
+        });
+    }
+
+    protected void buildToolCalls(Map<String, Object> map, List<FunctionCall> calls) {
+        List<Map<String, Object>> toolCalls = new ArrayList<>();
+        for (FunctionCall call : calls) {
+            Maps toolCall = new Maps();
+            toolCall.set("id", call.getId())
+                .set("type", "function")
+                .set("function", Maps.of("name", call.getName())
+                    .set("arguments", buildToolCallsArguments(call.getArgs()))
+                );
+
+            toolCalls.add(toolCall);
+        }
+        map.put("tool_calls", toolCalls);
+    }
+
+    protected Object buildToolCallsArguments(Map<String, Object> arguments) {
+        return JSON.toJSONString(arguments, SerializerFeature.DisableCircularReferenceDetect);
+    }
+
+
+    protected void buildMessageContent(Message message, Map<String, Object> map) {
+        map.put("content", message.getMessageContent());
+    }
+
+    @Override
+    public Object toFunctionsJsonObject(HumanMessage message) {
+        if (message == null) {
+            return null;
+        }
+        List<Function> functions = message.getFunctions();
+        if (functions == null || functions.isEmpty()) {
+            return null;
+        }
+
+        List<Map<String, Object>> functionsJsonArray = new ArrayList<>();
+        buildFunctionJsonArray(functionsJsonArray, functions);
+
+        return functionsJsonArray;
+    }
+
+    protected void buildFunctionJsonArray(List<Map<String, Object>> functionsJsonArray, List<Function> functions) {
+        for (Function function : functions) {
+            Map<String, Object> functionRoot = new HashMap<>();
+            functionRoot.put("type", "function");
+
+            Map<String, Object> functionObj = new HashMap<>();
+            functionRoot.put("function", functionObj);
+
+            functionObj.put("name", function.getName());
+            functionObj.put("description", function.getDescription());
+
+
+            Map<String, Object> parametersObj = new HashMap<>();
+            functionObj.put("parameters", parametersObj);
+            parametersObj.put("type", "object");
+
+            Map<String, Object> propertiesObj = new HashMap<>();
+            parametersObj.put("properties", propertiesObj);
+
+            addParameters(function.getParameters(), propertiesObj, parametersObj);
+
+            functionsJsonArray.add(functionRoot);
+        }
+    }
+
+    private static void addParameters(Parameter[] parameters, Map<String, Object> propertiesObj, Map<String, Object> parametersObj) {
+        List<String> requiredProperties = new ArrayList<>();
+        for (Parameter parameter : parameters) {
+            Map<String, Object> parameterObj = new HashMap<>();
+            parameterObj.put("type", parameter.getType());
+            parameterObj.put("description", parameter.getDescription());
+            parameterObj.put("enum", parameter.getEnums());
+            if (parameter.isRequired()) {
+                requiredProperties.add(parameter.getName());
+            }
+
+            List<Parameter> children = parameter.getChildren();
+            if (children != null && !children.isEmpty() && "object".equalsIgnoreCase(parameter.getType())) {
+                Map<String, Object> childrenObj = new HashMap<>();
+                parameterObj.put("properties", childrenObj);
+                addParameters(children.toArray(new Parameter[0]), childrenObj, parameterObj);
+            }
+
+            propertiesObj.put(parameter.getName(), parameterObj);
+        }
+
+        if (!requiredProperties.isEmpty()) {
+            parametersObj.put("required", requiredProperties);
+        }
+    }
+
+}