diff --git a/tools/tool_manager/specs/tool_manager.tool.yaml b/tools/tool_manager/specs/tool_manager.tool.yaml
index 00cda49..ba7429f 100644
--- a/tools/tool_manager/specs/tool_manager.tool.yaml
+++ b/tools/tool_manager/specs/tool_manager.tool.yaml
@@ -4,7 +4,7 @@ type: stdio
 tool: tool_manager
 path: /target/release/tool_manager
 risk_level: high
-timeout_secs: 120
+timeout_secs: 300
 params:
   - name: action
     required: true
@@ -23,7 +23,7 @@ params:
     desc: 参数列表数组，每项包含 name、required、desc
   - name: risk_level
     required: false
-    desc: 新工具风险级别，low 或 high，默认 low
+    desc: 已弃用，tool_manager 创建/更新的工具一律强制 high risk，传入值将被忽略
   - name: timeout_secs
     required: false
     desc: 新工具超时时间秒数，默认 30
diff --git a/tools/tool_manager/src/main.rs b/tools/tool_manager/src/main.rs
index fbe9ac3..bb69e60 100644
--- a/tools/tool_manager/src/main.rs
+++ b/tools/tool_manager/src/main.rs
@@ -1,10 +1,22 @@
 //! tool_manager — 受控创建、修改、构建本地工具
+//!
+//! 安全约束：
+//! - 不允许操作保留工具名（含 `tool_manager` 自身），防止自改后门
+//! - 由本工具创建/更新的工具一律 `risk_level: high`，忽略调用方传入值
+//! - 所有调用追加写入 `tools/.tool_audit.log` 审计日志
+//! - 构建使用 `timeout` 限制时长，失败时清理残留二进制，避免调用旧版本"假成功"
 
 use serde_json::{Value, json};
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 
+/// 保留工具名 —— 禁止 create/update/build
+const RESERVED_NAMES: &[&str] = &["target", "specs", "src", ".", "..", "tool_manager"];
+
+/// 构建超时（秒）。需小于 tool_manager 自身的 timeout_secs。
+const BUILD_TIMEOUT_SECS: u64 = 180;
+
 fn main() {
     let input: Value = match serde_json::from_reader(std::io::stdin()) {
         Ok(v) => v,
@@ -12,13 +24,20 @@ fn main() {
     };
 
     let params = &input["params"];
+    let user_id = input["user_id"].as_str().unwrap_or("unknown");
     let action = params["action"].as_str().unwrap_or("");
     let tool_name = params["tool_name"].as_str().unwrap_or("");
 
-    let output = match run(action, tool_name, params) {
-        Ok(msg) => msg,
-        Err(e) => format!("工具管理失败: {e}"),
+    let (output, success) = match run(action, tool_name, params) {
+        Ok(msg) => (msg, true),
+        Err(e) => (format!("工具管理失败: {e}"), false),
     };
+
+    // 审计日志（best effort，不影响主流程）
+    if let Ok(tools_root) = locate_tools_root() {
+        audit(&tools_root, user_id, action, tool_name, success, &output);
+    }
+
     result(&output);
 }
 
@@ -38,7 +57,7 @@ fn run(action: &str, tool_name: &str, params: &Value) -> Result<String, String>
             write_tool_project(&tool_dir, tool_name, params)?;
             build_tool(&tool_dir, tool_name)?;
             Ok(format!(
-                "已创建并构建工具 {tool_name}。可通过 query_capabilities 查看并用 call_capability 调用。"
+                "已创建并构建工具 {tool_name}（risk_level 强制为 high）。可通过 query_capabilities 查看并用 call_capability 调用。"
             ))
         }
         "update_tool" => {
@@ -48,7 +67,7 @@ fn run(action: &str, tool_name: &str, params: &Value) -> Result<String, String>
             update_tool_project(&tool_dir, tool_name, params)?;
             build_tool(&tool_dir, tool_name)?;
             Ok(format!(
-                "已修改并构建工具 {tool_name}。注册表重载后即可使用最新版本。"
+                "已修改并构建工具 {tool_name}（risk_level 强制为 high）。注册表重载后即可使用最新版本。"
             ))
         }
         "build_tool" => {
@@ -83,6 +102,7 @@ fn update_tool_project(tool_dir: &Path, tool_name: &str, params: &Value) -> Resu
         fs::write(tool_dir.join("src/main.rs"), code).map_err(|e| e.to_string())?;
     }
 
+    // spec 一旦由 tool_manager 管理，risk_level 恒为 high
     let should_update_spec = params.get("description").is_some()
         || params.get("params").is_some()
         || params.get("risk_level").is_some()
@@ -101,7 +121,12 @@ fn update_tool_project(tool_dir: &Path, tool_name: &str, params: &Value) -> Resu
 }
 
 fn build_tool(tool_dir: &Path, tool_name: &str) -> Result<(), String> {
-    let output = Command::new("cargo")
+    let binary = tool_dir.join("target/release").join(tool_name);
+
+    // 用 `timeout` 限制构建时长，超时返回 124；cargo 及其子进程都会被信号终止
+    let output = Command::new("timeout")
+        .arg(BUILD_TIMEOUT_SECS.to_string())
+        .arg("cargo")
         .arg("build")
         .arg("--release")
         .current_dir(tool_dir)
@@ -109,11 +134,18 @@ fn build_tool(tool_dir: &Path, tool_name: &str) -> Result<(), String> {
         .map_err(|e| format!("启动 cargo 失败: {e}"))?;
 
     if !output.status.success() {
+        // 构建失败：删除可能残留的旧二进制，避免 reload 后仍调用旧版本造成"假成功"
+        let _ = fs::remove_file(&binary);
+        let code = output.status.code().unwrap_or(-1);
         let stderr = String::from_utf8_lossy(&output.stderr);
-        return Err(format!("cargo build 失败: {}", stderr.trim()));
+        let reason = if code == 124 {
+            format!("构建超时（{BUILD_TIMEOUT_SECS}s）")
+        } else {
+            stderr.trim().to_string()
+        };
+        return Err(format!("cargo build 失败(退出码 {code}): {reason}"));
     }
 
-    let binary = tool_dir.join("target/release").join(tool_name);
     if !binary.exists() {
         return Err(format!("构建后未找到二进制: {}", binary.display()));
     }
@@ -122,10 +154,11 @@ fn build_tool(tool_dir: &Path, tool_name: &str) -> Result<(), String> {
 
 fn locate_tools_root() -> Result<PathBuf, String> {
     let exe = std::env::current_exe().map_err(|e| e.to_string())?;
+    // exe = tools/tool_manager/target/release/tool_manager
     let tool_dir = exe
-        .parent()
-        .and_then(Path::parent)
-        .and_then(Path::parent)
+        .parent() // .../target/release
+        .and_then(Path::parent) // .../target
+        .and_then(Path::parent) // .../tool_manager
         .ok_or_else(|| "无法定位 tool_manager 目录".to_string())?;
     tool_dir
         .parent()
@@ -171,14 +204,13 @@ fn main() {{
 }
 
 fn spec_yaml(tool_name: &str, params: &Value) -> String {
+    // 安全约束：tool_manager 产出的工具一律高风险，忽略调用方传入的 risk_level
+    let risk_level = "high";
+    let timeout_secs = params["timeout_secs"].as_u64().unwrap_or(30).clamp(1, 300);
+
     let desc = params["description"]
         .as_str()
-        .unwrap_or("由 tool_manager 创建的本地工具");
-    let risk_level = match params["risk_level"].as_str() {
-        Some("high") => "high",
-        _ => "low",
-    };
-    let timeout_secs = params["timeout_secs"].as_u64().unwrap_or(30).clamp(1, 300);
+        .unwrap_or("由 tool_manager 创建的本地工具（自动标记 high risk）");
 
     let mut out = format!(
         "name: {tool_name}\n\
@@ -218,8 +250,10 @@ fn validate_tool_name(name: &str) -> Result<(), String> {
     if name.is_empty() {
         return Err("缺少 tool_name".to_string());
     }
-    if matches!(name, "target" | "specs" | "src" | "." | "..") {
-        return Err("tool_name 使用了保留名称".to_string());
+    if RESERVED_NAMES.contains(&name) {
+        return Err(format!(
+            "tool_name '{name}' 是保留名称，禁止 create/update/build"
+        ));
     }
     if !name
         .chars()
@@ -253,6 +287,32 @@ fn truthy(value: Option<&Value>) -> bool {
     }
 }
 
+/// 追加审计日志到 tools 根目录下的 .tool_audit.log
+fn audit(
+    tools_root: &Path,
+    user_id: &str,
+    action: &str,
+    tool_name: &str,
+    success: bool,
+    detail: &str,
+) {
+    let ts = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .map(|d| d.as_secs())
+        .unwrap_or(0);
+    // detail 可能很长，截断到 200 字节避免日志膨胀
+    let detail: String = detail.chars().take(200).collect();
+    let line = format!(
+        "{ts}\t{user_id}\t{action}\t{tool_name}\t{}\t{detail}\n",
+        if success { "ok" } else { "err" }
+    );
+    let path = tools_root.join(".tool_audit.log");
+    if let Ok(mut f) = fs::OpenOptions::new().create(true).append(true).open(&path) {
+        use std::io::Write;
+        let _ = f.write_all(line.as_bytes());
+    }
+}
+
 fn result(content: &str) {
     println!("{}", json!({"type":"result","content":content}));
 }