feat: optimize editing tools

agent/prompt/builder.py

@@ -305,8 +305,8 @@ def _build_memory_section(memory_manager: Any, tools: Optional[List[Any]], langu
         "",
         "在回答关于以前的工作、决定、日期、人物、偏好或待办事项的任何问题之前：",
         "",
-        "1. 不确定信息位置 → 先用 `memory_search` 通过关键词和语义检索相关内容",
+        "1. 不确定记忆文件位置 → 先用 `memory_search` 通过关键词和语义检索相关内容",
-        "2. 已知文件和大致位置 → 直接用 `memory_get` 读取相应的行",
+        "2. 已知文件位置 → 直接用 `memory_get` 读取相应的行",
         "3. search 无结果 → 尝试用 `memory_get` 读取最近两天的记忆文件",
         "",
         "**记忆文件结构**:",
@@ -317,10 +317,10 @@ def _build_memory_section(memory_manager: Any, tools: Optional[List[Any]], langu
         "- 自然使用记忆，就像你本来就知道; 不用刻意提起或列举记忆，除非用户提起相关内容",
         "",
         "**写入记忆的正确方式**:",
-        "- 追加到现有文件末尾 → 用 `read` 读取文件最后几行（offset=-10），然后用 `edit` 追加",
+        "- 追加到现有文件末尾 → 用 `edit` 工具，oldText 留空",
-        "  例: read(path=memory/2026-02-01.md, offset=-10) → 看到最后内容 → edit(oldText=最后几行完整文本, newText=最后几行+新内容)",
+        "  例: edit(path=memory/2026-02-01.md, oldText=\"\", newText=\"\\n## 新内容\\n...\")",
+        "- 修改文件中的某段文字 → 用 `edit` 工具，oldText 填写要替换的文本",
         "- 创建新文件 → 用 `write`",
-        "- ⚠️ 不要用 `memory_get` 读取后再 `edit`，因为会截断长文本",
         "",
     ]
     

agent/tools/edit/edit.py

@@ -22,7 +22,7 @@ class Edit(BaseTool):
     """Tool for precise file editing"""
     
     name: str = "edit"
-    description: str = "Edit a file by replacing exact text. The oldText must match exactly (including whitespace). Use this for precise, surgical edits."
+    description: str = "Edit a file by replacing exact text, or append to end if oldText is empty. For append: use empty oldText. For replace: oldText must match exactly (including whitespace)."
     
     params: dict = {
         "type": "object",
@@ -33,7 +33,7 @@ class Edit(BaseTool):
             },
             "oldText": {
                 "type": "string",
-                "description": "Exact text to find and replace (must match exactly, cannot be empty). To append to end of file, include the last few lines as oldText."
+                "description": "Text to find and replace. Use empty string to append to end of file. For replacement: must match exactly including whitespace."
             },
             "newText": {
                 "type": "string",
@@ -89,6 +89,17 @@ class Edit(BaseTool):
             normalized_old_text = normalize_to_lf(old_text)
             normalized_new_text = normalize_to_lf(new_text)
             
+            # Special case: empty oldText means append to end of file
+            if not old_text or not old_text.strip():
+                # Append mode: add newText to the end
+                # Add newline before newText if file doesn't end with one
+                if normalized_content and not normalized_content.endswith('\n'):
+                    new_content = normalized_content + '\n' + normalized_new_text
+                else:
+                    new_content = normalized_content + normalized_new_text
+                base_content = normalized_content  # For verification
+            else:
+                # Normal edit mode: find and replace
                 # Use fuzzy matching to find old text (try exact match first, then fuzzy match)
                 match_result = fuzzy_find_text(normalized_content, normalized_old_text)