diff --git a/plugin-sdk/src/lib.rs b/plugin-sdk/src/lib.rs
index 0eca33d..f9a94e1 100644
--- a/plugin-sdk/src/lib.rs
+++ b/plugin-sdk/src/lib.rs
@@ -518,13 +518,22 @@ impl MessageSender {
     ///
     /// # let sender: MessageSender = unimplemented!();
     /// sender.broadcast(
-    ///     "network",
-    ///     Message::WifiProvisioned {
-    ///         ssid: "Office-WiFi".to_string(),
-    ///         ip: "192.168.1.8".to_string(),
+    ///     "video",
+    ///     Message::StateChanged {
+    ///         old_state: "idle".to_string(),
+    ///         new_state: "playing".to_string(),
     ///     },
     /// );
     /// ```
+    ///
+    /// # 注意：Phase 2 占位消息
+    /// 以下消息变体当前在核心代码中**无生产者**，仅作为 Phase 2 占位保留。
+    /// 插件开发者不应在 `handle_message` 中为其编写业务逻辑（写了也不会被触发），
+    /// 也不应主动广播它们（核心不消费）：
+    /// - `Message::WifiProvisioned` — WiFi 配网完成事件（待 WiFi 插件补生产者）
+    /// - `Message::DeviceEvent` — 设备事件上报通道（待 DeviceBackend trait 扩展）
+    /// - `Message::CursorVisibility` — 光标可见性（实际链路已改走
+    ///   `DeviceCommand::SetCursorVisible`，此变体仅为向后兼容保留）
     pub fn broadcast(&self, from: &str, message: Message) {
         self.send(&Envelope {
             from: from.to_string(),
diff --git a/src/core/service_manager.rs b/src/core/service_manager.rs
index 48d6e78..52f0e66 100644
--- a/src/core/service_manager.rs
+++ b/src/core/service_manager.rs
@@ -730,16 +730,24 @@ impl ServiceManager {
         Ok(())
     }
 
-    fn check_plugin_updates(&self) -> Result<()> {
+    fn check_plugin_updates(&self) -> Result<Vec<(String, String, String)>> {
         let repo = self.plugin_repository()?;
         let registry = self.plugin_loader()?.load_registry()?;
+        let mut updates = Vec::new();
 
         for (plugin_id, entry) in &registry.plugins {
             match repo.check_update(plugin_id, &entry.active_version)? {
-                Some(version) => println!(
-                    "[ServiceManager] 插件 '{plugin_id}' 发现可用更新: {} -> {version}",
-                    entry.active_version
-                ),
+                Some(version) => {
+                    println!(
+                        "[ServiceManager] 插件 '{plugin_id}' 发现可用更新: {} -> {version}",
+                        entry.active_version
+                    );
+                    updates.push((
+                        plugin_id.clone(),
+                        entry.active_version.clone(),
+                        version,
+                    ));
+                }
                 None => println!(
                     "[ServiceManager] 插件 '{plugin_id}' 已是最新版本 {}",
                     entry.active_version
@@ -747,7 +755,7 @@ impl ServiceManager {
             }
         }
 
-        Ok(())
+        Ok(updates)
     }
 
     fn broadcast_plugin_states(&mut self) {
@@ -865,8 +873,30 @@ impl ServiceManager {
                         true
                     }
                     "plugin_check_updates" => {
-                        if let Err(error) = self.check_plugin_updates() {
-                            eprintln!("[ServiceManager] plugin_check_updates 失败: {error}");
+                        match self.check_plugin_updates() {
+                            Ok(updates) => {
+                                // 将检查结果通过 Custom 消息广播，供 HTTP 客户端等消费方获取
+                                let payload = serde_json::to_string(
+                                    &updates
+                                        .iter()
+                                        .map(|(id, cur, new)| {
+                                            serde_json::json!({
+                                                "id": id,
+                                                "current_version": cur,
+                                                "available_version": new,
+                                            })
+                                        })
+                                        .collect::<Vec<_>>(),
+                                )
+                                .unwrap_or_else(|_| "[]".to_string());
+                                self.broadcast_message(Message::Custom {
+                                    kind: "plugin_updates".to_string(),
+                                    payload,
+                                });
+                            }
+                            Err(error) => {
+                                eprintln!("[ServiceManager] plugin_check_updates 失败: {error}");
+                            }
                         }
                         true
                     }
diff --git a/src/plugins/device/mod.rs b/src/plugins/device/mod.rs
index e85b08e..4fa3638 100644
--- a/src/plugins/device/mod.rs
+++ b/src/plugins/device/mod.rs
@@ -121,7 +121,10 @@ impl Plugin for DevicePlugin {
                 let response = match self.backend.handle_command(cmd) {
                     Ok(resp) => resp,
                     Err(e) => {
-                        // 将错误转换为 DeviceResponse::Error
+                        // 将错误转换为 DeviceResponse::Error，并记录日志
+                        // （核心静态插件目前无人消费 DeviceResponse，故至少在此留痕，
+                        //   避免设备层故障完全静默——王浩然风险3 建议）
+                        eprintln!("[DevicePlugin] 命令处理失败: {e}");
                         crate::core::message::DeviceResponse::Error(e.to_string())
                     }
                 };