diff --git a/README.md b/README.md
index 426914b..d5e0031 100644
--- a/README.md
+++ b/README.md
@@ -66,12 +66,14 @@ git clone https://github.com/perkfly/ex-skill ~/.claude/skills/create-ex
 git clone https://github.com/perkfly/ex-skill ~/.openclaw/workspace/skills/create-ex
 ```
 
-### 依赖（可选）
+### 依赖
 
 ```bash
 pip3 install -r requirements.txt
 ```
 
+> ⚠️ 使用**中文昵称**时 `pypinyin` 为必需依赖：未安装时无法从中文昵称生成 slug，工具会明确报错并提示。仅使用英文昵称可跳过安装。
+
 ---
 
 ## 使用
diff --git a/README_EN.md b/README_EN.md
index ffe94ea..02fa117 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -60,12 +60,14 @@ git clone https://github.com/perkfly/ex-skill .claude/skills/create-ex
 git clone https://github.com/perkfly/ex-skill ~/.claude/skills/create-ex
 ```
 
-### Dependencies (optional)
+### Dependencies
 
 ```bash
 pip3 install -r requirements.txt
 ```
 
+> ⚠️ `pypinyin` is **required for Chinese nicknames** — without it no slug can be generated from a Chinese name (the tool fails with a clear error instead of silently colliding). Optional if you only use ASCII nicknames.
+
 ---
 
 ## Usage
diff --git a/SKILL.md b/SKILL.md
index fc1755f..9a7bcdc 100644
--- a/SKILL.md
+++ b/SKILL.md
@@ -210,6 +210,8 @@ Persona 摘要：
 
 用户确认后，执行以下写入操作：
 
+**0. 检查 slug 冲突**：若 `exes/{slug}` 目录已存在，**停止写入**，询问用户是换一个 slug 还是确认覆盖（覆盖前先用 `version_manager.py --action backup` 存档）。不要静默覆盖已有前任的数据。
+
 **1. 创建目录结构**（用 Bash）：
 ```bash
 mkdir -p exes/{slug}/versions
@@ -551,6 +553,8 @@ Confirm generation? Or need adjustments?
 
 After user confirmation, execute the following:
 
+**0. Check for slug collision**: if `exes/{slug}` already exists, **stop** and ask the user to pick a different slug or explicitly confirm overwriting (archive first via `version_manager.py --action backup`). Never silently overwrite an existing ex.
+
 **1. Create directory structure** (Bash):
 ```bash
 mkdir -p exes/{slug}/versions
diff --git a/requirements.txt b/requirements.txt
index 152b59c..5ca81dc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
-# Optional: Chinese name → slug conversion
+# Required for Chinese nicknames (slug generation); optional for ASCII-only names
+# 中文昵称必需（用于生成 slug）；纯英文昵称可不装
 pypinyin>=0.48.0
 
 # Optional: Better EXIF support for more image formats (HEIC, TIFF, etc.)
diff --git a/tools/skill_writer.py b/tools/skill_writer.py
index 6bcad94..7b26110 100644
--- a/tools/skill_writer.py
+++ b/tools/skill_writer.py
@@ -69,6 +69,8 @@ def slugify(name: str) -> str:
     """
     将姓名转为 slug。
     优先尝试 pypinyin（如已安装），否则 fallback 到简单处理。
+    无法生成有效 slug 时返回空字符串（例如：中文昵称 + 未安装 pypinyin），
+    由调用方决定如何处理，避免不同昵称静默撞车。
     """
     try:
         from pypinyin import lazy_pinyin
@@ -86,7 +88,7 @@ def slugify(name: str) -> str:
 
     import re
     slug = re.sub(r"_+", "_", slug).strip("_")
-    return slug if slug else "ex"
+    return slug
 
 
 def build_identity_string(meta: dict) -> str:
@@ -125,9 +127,14 @@ def create_skill(
     memories_content: str,
     persona_content: str,
 ) -> Path:
-    """创建新的前任 Skill 目录结构"""
+    """创建新的前任 Skill 目录结构。目标目录已存在时抛出 FileExistsError，防止静默覆盖。"""
 
     skill_dir = base_dir / slug
+    if skill_dir.exists():
+        raise FileExistsError(
+            f"{skill_dir} 已存在。请换一个 slug，"
+            f"或先用 version_manager.py 存档/手动备份后再删除，避免静默覆盖导致数据丢失"
+        )
     skill_dir.mkdir(parents=True, exist_ok=True)
 
     # 创建子目录
@@ -343,7 +350,14 @@ def main() -> None:
         if args.name:
             meta["name"] = args.name
 
-        slug = args.slug or slugify(meta.get("name", "ex"))
+        slug = args.slug or slugify(meta.get("name", ""))
+        if not slug:
+            print(
+                "错误：无法从昵称生成 slug（中文昵称需要安装 pypinyin：pip3 install pypinyin），"
+                "或请显式传入 --slug",
+                file=sys.stderr,
+            )
+            sys.exit(1)
 
         memories_content = ""
         if args.memories:
@@ -353,7 +367,11 @@ def main() -> None:
         if args.persona:
             persona_content = Path(args.persona).read_text(encoding="utf-8")
 
-        skill_dir = create_skill(base_dir, slug, meta, memories_content, persona_content)
+        try:
+            skill_dir = create_skill(base_dir, slug, meta, memories_content, persona_content)
+        except FileExistsError as e:
+            print(f"错误：{e}", file=sys.stderr)
+            sys.exit(1)
         print(f"✅ Skill 已创建：{skill_dir}")
         print(f"   触发词：/{slug}")