diff --git a/src-tauri/src/mcp_tools.rs b/src-tauri/src/mcp_tools.rs
index 2d1e2be..1c5c1a0 100644
--- a/src-tauri/src/mcp_tools.rs
+++ b/src-tauri/src/mcp_tools.rs
@@ -240,6 +240,11 @@ pub fn tools_list_result() -> Value {
                     },
                     "required": ["project_id"]
                 }
+            },
+            {
+                "name": "scan_unregistered_projects",
+                "description": "扫描已登记项目的父目录，找出存在于文件系统但尚未在炼境注册的项目目录。返回每个未注册目录的路径、是否有 .git、技术栈特征文件（package.json / Cargo.toml / go.mod）、是否有 AGENTS.md。用于日常发现漏网项目并决定是否接入炼境。",
+                "inputSchema": { "type": "object", "properties": {}, "required": [] }
             }
         ]
     })
@@ -456,6 +461,7 @@ pub async fn tools_call(group_id: &str, params: Option<&Value>) -> Value {
             crate::commands::cicd::distribute_workflow_for_project(pid, wt)
         }
         "list_all_projects" => list_all_projects(),
+        "scan_unregistered_projects" => scan_unregistered_projects(),
         "apply_onboarding_pack" => {
             let pid = args.get("project_id").and_then(|v| v.as_str()).unwrap_or("");
             resolve_project_root(&gid, pid).and_then(|root| {
@@ -897,6 +903,117 @@ pub fn list_all_projects() -> Result<String, String> {
     Ok(out)
 }
 
+pub fn scan_unregistered_projects() -> Result<String, String> {
+    let conn = db::pool().get().map_err(|e| e.to_string())?;
+
+    // 取所有已登记的 win_path
+    let mut stmt = conn
+        .prepare("SELECT win_path FROM project_workspaces WHERE win_path IS NOT NULL")
+        .map_err(|e| e.to_string())?;
+    let registered_paths: std::collections::HashSet<String> = stmt
+        .query_map([], |r| r.get::<_, String>(0))
+        .map_err(|e| e.to_string())?
+        .filter_map(|r| r.ok())
+        .map(|p| p.trim_end_matches(['/', '\\']).to_string())
+        .collect();
+
+    // 推导父目录（去重）
+    let mut parent_dirs: std::collections::HashSet<std::path::PathBuf> =
+        std::collections::HashSet::new();
+    for p in &registered_paths {
+        if let Some(parent) = std::path::Path::new(p).parent() {
+            parent_dirs.insert(parent.to_path_buf());
+        }
+    }
+
+    if parent_dirs.is_empty() {
+        return Ok("炼境暂无登记项目，无法推导扫描目录。".to_string());
+    }
+
+    let mut unregistered: Vec<(String, bool, Vec<String>, bool)> = Vec::new();
+
+    for parent in &parent_dirs {
+        let entries = std::fs::read_dir(parent).map_err(|e| e.to_string())?;
+        for entry in entries.flatten() {
+            let path = entry.path();
+            if !path.is_dir() {
+                continue;
+            }
+            let path_str = path.to_string_lossy().trim_end_matches(['/', '\\']).to_string();
+            if registered_paths.contains(&path_str) {
+                continue;
+            }
+            // 隐藏目录跳过
+            if path
+                .file_name()
+                .and_then(|n| n.to_str())
+                .map(|n| n.starts_with('.'))
+                .unwrap_or(false)
+            {
+                continue;
+            }
+
+            let has_git = path.join(".git").exists();
+            let mut stack: Vec<String> = Vec::new();
+            if path.join("package.json").exists() {
+                stack.push("JS/TS".into());
+            }
+            if path.join("Cargo.toml").exists() {
+                stack.push("Rust".into());
+            }
+            if path.join("go.mod").exists() {
+                stack.push("Go".into());
+            }
+            if path.join("pom.xml").exists() {
+                stack.push("Java".into());
+            }
+            let has_agents = path.join("AGENTS.md").exists();
+
+            unregistered.push((path_str, has_git, stack, has_agents));
+        }
+    }
+
+    if unregistered.is_empty() {
+        return Ok(format!(
+            "扫描了 {} 个父目录，所有子目录均已在炼境注册。",
+            parent_dirs.len()
+        ));
+    }
+
+    unregistered.sort_by(|a, b| a.0.cmp(&b.0));
+
+    let mut out = format!(
+        "## 未注册目录（共 {} 个）\n\n扫描范围：{}\n\n",
+        unregistered.len(),
+        parent_dirs
+            .iter()
+            .map(|p| p.to_string_lossy().to_string())
+            .collect::<Vec<_>>()
+            .join("、")
+    );
+
+    for (path, has_git, stack, has_agents) in &unregistered {
+        let git_icon = if *has_git { "🗂 git" } else { "❌ 无git" };
+        let agents_icon = if *has_agents { "📄 AGENTS" } else { "—" };
+        let stack_str = if stack.is_empty() {
+            "未知".to_string()
+        } else {
+            stack.join("/")
+        };
+        let name = std::path::Path::new(path)
+            .file_name()
+            .map(|n| n.to_string_lossy().to_string())
+            .unwrap_or_else(|| path.clone());
+        out.push_str(&format!(
+            "- **{}** | {} | {} | {}\n  `{}`\n\n",
+            name, git_icon, stack_str, agents_icon, path
+        ));
+    }
+
+    out.push_str("---\n在炼境 UI 添加项目后，调用 `apply_onboarding_pack(project_id)` 分发接入包。");
+    Ok(out)
+}
+
 // ── 测试 ─────────────────────────────────────────────────────────────────────
 
 #[cfg(test)]
@@ -915,6 +1032,10 @@ mod tests {
         assert!(names.contains(&"apply_onboarding_pack"), "缺少 apply_onboarding_pack");
         assert!(names.contains(&"verify_onboarding"), "缺少 verify_onboarding");
         assert!(names.contains(&"list_all_projects"), "缺少 list_all_projects");
+        assert!(
+            names.contains(&"scan_unregistered_projects"),
+            "缺少 scan_unregistered_projects"
+        );
         assert!(names.contains(&"inject_mcp"), "缺少 inject_mcp");
         assert!(names.contains(&"create_pull_request"), "缺少 create_pull_request");
         assert!(names.contains(&"poll_now"), "缺少 poll_now");