diff --git a/src/hooks/session-notification-scheduler.ts b/src/hooks/session-notification-scheduler.ts
index afea12c7f..298fbe95a 100644
--- a/src/hooks/session-notification-scheduler.ts
+++ b/src/hooks/session-notification-scheduler.ts
@@ -1,5 +1,4 @@
 import type { PluginInput } from "@opencode-ai/plugin"
-import type { Platform } from "./session-notification-sender"
 
 type SessionNotificationConfig = {
   playSound: boolean
@@ -13,11 +12,10 @@ type SessionNotificationConfig = {
 
 export function createIdleNotificationScheduler(options: {
   ctx: PluginInput
-  platform: Platform
   config: SessionNotificationConfig
   hasIncompleteTodos: (ctx: PluginInput, sessionID: string) => Promise<boolean>
-  send: (ctx: PluginInput, platform: Platform, sessionID: string) => Promise<void>
-  playSound: (ctx: PluginInput, platform: Platform, soundPath: string) => Promise<void>
+  send: (ctx: PluginInput, sessionID: string) => Promise<void>
+  playSound: (ctx: PluginInput, soundPath: string) => Promise<void>
 }) {
   const notifiedSessions = new Set<string>()
   const pendingTimers = new Map<string, ReturnType<typeof setTimeout>>()
@@ -136,10 +134,10 @@ export function createIdleNotificationScheduler(options: {
 
       notifiedSessions.add(sessionID)
 
-      await options.send(options.ctx, options.platform, sessionID)
+      await options.send(options.ctx, sessionID)
 
       if (options.config.playSound && options.config.soundPath) {
-        await options.playSound(options.ctx, options.platform, options.config.soundPath)
+        await options.playSound(options.ctx, options.config.soundPath)
       }
     } finally {
       executingNotifications.delete(sessionID)
diff --git a/src/hooks/session-notification.ts b/src/hooks/session-notification.ts
index f9a40f56d..c9178f0df 100644
--- a/src/hooks/session-notification.ts
+++ b/src/hooks/session-notification.ts
@@ -47,10 +47,10 @@ export function createSessionNotification(ctx: PluginInput, config: SessionNotif
 
   const scheduler = createIdleNotificationScheduler({
     ctx,
-    platform: "unsupported",
     config: mergedConfig,
     hasIncompleteTodos,
-    send: async (hookCtx, platform, sessionID) => {
+    send: async (hookCtx, sessionID) => {
+      const platform = ensureNotificationPlatform()
       if (typeof hookCtx.client.session.get !== "function" && typeof hookCtx.client.session.messages !== "function") {
         await sessionNotificationSender.sendSessionNotification(hookCtx, platform, mergedConfig.title, mergedConfig.message)
         return
@@ -64,7 +64,10 @@ export function createSessionNotification(ctx: PluginInput, config: SessionNotif
 
       await sessionNotificationSender.sendSessionNotification(hookCtx, platform, content.title, content.message)
     },
-    playSound: sessionNotificationSender.playSessionNotificationSound,
+    playSound: async (hookCtx, soundPath) => {
+      const platform = ensureNotificationPlatform()
+      await sessionNotificationSender.playSessionNotificationSound(hookCtx, platform, soundPath)
+    },
   })
 
   const QUESTION_TOOLS = new Set(["question", "ask_user_question", "askuserquestion"])