diff --git a/harness-api.md b/harness-api.md
index 3fc5dce..68bcce4 100644
--- a/harness-api.md
+++ b/harness-api.md
@@ -92,6 +92,7 @@
 | sessionId | Long | 是 | 会话ID |
 | username | String | 是 | 用户名 |
 | subagentOutput | String | 是 | 子智能体回复内容 |
+| context | Map | 否 | 自定义扩展数据 |
 
 #### 请求示例
 
@@ -99,7 +100,11 @@
 {
   "sessionId": 1001,
   "username": "zhangsan",
-  "subagentOutput": "在第42行发现潜在的空指针异常，建议添加空值检查..."
+  "subagentOutput": "在第42行发现潜在的空指针异常，建议添加空值检查...",
+  "context": {
+    "key1": "xxx",
+    "key2": "yyy"
+  }
 }
 ```
 
@@ -307,7 +312,10 @@ curl -X GET {gateway}/harness/session/message/1872639000000000001
             "messageId": "1872639000000001001",
             "messageType": "USER",
             "message": "你好，请问如何配置聊天模型？",
-            "context": null,
+            "context": {
+                "key1": "xxx",
+                "key2": "yyy"
+            },
             "createTime": "2026-09-20 10:30:00"
         },
         {