diff --git a/Tun/Punchnet/SDLTunnelAppNotifier.swift b/Tun/Punchnet/SDLTunnelAppNotifier.swift
new file mode 100644
index 0000000..60a0b1f
--- /dev/null
+++ b/Tun/Punchnet/SDLTunnelAppNotifier.swift
@@ -0,0 +1,71 @@
+//
+//  SDLTunnelAppNotifier.swift
+//  Tun
+//
+//  Created by 安礼成 on 2026/4/15.
+//
+
+import Foundation
+
+final class SDLTunnelAppNotifier {
+    struct Event: Codable, Sendable {
+        enum Level: String, Codable, Sendable {
+            case info
+            case warning
+            case error
+            case fatal
+        }
+        
+        let id: String
+        let timestamp: TimeInterval
+        let level: Level
+        let code: Int?
+        let message: String
+    }
+    
+    static let shared = SDLTunnelAppNotifier()
+    
+    static let appGroupSuiteName = "group.com.jihe.punchnetmac"
+    static let latestEventKey = "tunnel.latestEvent"
+    
+    private let suiteName: String
+    private let eventKey: String
+    
+    init(suiteName: String = SDLTunnelAppNotifier.appGroupSuiteName,
+         eventKey: String = SDLTunnelAppNotifier.latestEventKey) {
+        self.suiteName = suiteName
+        self.eventKey = eventKey
+    }
+    
+    func publish(level: Event.Level = .error, code: Int? = nil, message: String) {
+        let event = Event(
+            id: UUID().uuidString,
+            timestamp: Date().timeIntervalSince1970,
+            level: level,
+            code: code,
+            message: message
+        )
+        self.publish(event)
+    }
+    
+    func publish(_ event: Event) {
+        guard let shared = UserDefaults(suiteName: self.suiteName),
+              let data = try? JSONEncoder().encode(event) else {
+            return
+        }
+        
+        shared.set(data, forKey: self.eventKey)
+        shared.synchronize()
+        DarwinNotificationCenter.shared.post(.tunnelEventChanged)
+    }
+    
+    func clear() {
+        guard let shared = UserDefaults(suiteName: self.suiteName) else {
+            return
+        }
+        
+        shared.removeObject(forKey: self.eventKey)
+        shared.synchronize()
+        DarwinNotificationCenter.shared.post(.tunnelEventChanged)
+    }
+}
diff --git a/punchnet/Core/DarwinNotificationCenter.swift b/punchnet/Core/DarwinNotificationCenter.swift
index 02b3af4..11b01c6 100644
--- a/punchnet/Core/DarwinNotificationCenter.swift
+++ b/punchnet/Core/DarwinNotificationCenter.swift
@@ -18,6 +18,7 @@ public struct DarwinNotificationName: RawRepresentable, Hashable {
 // 预定义名称
 extension DarwinNotificationName {
     static let vpnStatusChanged = DarwinNotificationName(rawValue: "com.jihe.punchnetmac.vpnStatusChanged")
+    static let tunnelEventChanged = DarwinNotificationName(rawValue: "com.jihe.punchnetmac.tunnelEventChanged")
 }