diff --git a/src/hooks/session-notification.test.ts b/src/hooks/session-notification.test.ts
index ad6eb53..a169477 100644
--- a/src/hooks/session-notification.test.ts
+++ b/src/hooks/session-notification.test.ts
@@ -1,4 +1,6 @@
-import { describe, expect, test, beforeEach, afterEach, spyOn } from "bun:test"
+import { describe, expect, test, beforeEach, afterEach, spyOn, mock } from "bun:test"
+import { EventEmitter } from "node:events"
+import * as childProcess from "node:child_process"
 
 import { createSessionNotification } from "./session-notification"
 import { setMainSession, subagentSessions } from "../features/claude-code-session-state"
@@ -6,20 +8,11 @@ import * as utils from "./session-notification-utils"
 
 describe("session-notification", () => {
   let notificationCalls: string[]
+  let spawnMock: ReturnType<typeof spyOn>
 
   function createMockPluginInput() {
     return {
-      $: async (cmd: TemplateStringsArray | string, ...values: any[]) => {
-        // #given - track notification commands (osascript, notify-send, powershell)
-        const cmdStr = typeof cmd === "string" 
-          ? cmd 
-          : cmd.reduce((acc, part, i) => acc + part + (values[i] ?? ""), "")
-        
-        if (cmdStr.includes("osascript") || cmdStr.includes("notify-send") || cmdStr.includes("powershell")) {
-          notificationCalls.push(cmdStr)
-        }
-        return { stdout: "", stderr: "", exitCode: 0 }
-      },
+      $: async () => ({ stdout: "", stderr: "", exitCode: 0 }),
       client: {
         session: {
           todo: async () => ({ data: [] }),
@@ -32,6 +25,18 @@ describe("session-notification", () => {
   beforeEach(() => {
     notificationCalls = []
     
+    // Mock spawn to track notification commands
+    // Uses node:child_process.spawn instead of Bun shell to avoid GC crash
+    spawnMock = spyOn(childProcess, "spawn").mockImplementation((cmd: string, args?: string[]) => {
+      // Track notification commands (osascript, notify-send, powershell)
+      if (cmd.includes("osascript") || cmd.includes("notify-send") || cmd.includes("powershell")) {
+        notificationCalls.push(`${cmd} ${(args ?? []).join(" ")}`)
+      }
+      const emitter = new EventEmitter()
+      setTimeout(() => emitter.emit("close", 0), 0)
+      return emitter as any
+    })
+    
     spyOn(utils, "getOsascriptPath").mockResolvedValue("/usr/bin/osascript")
     spyOn(utils, "getNotifySendPath").mockResolvedValue("/usr/bin/notify-send")
     spyOn(utils, "getPowershellPath").mockResolvedValue("powershell")
diff --git a/src/hooks/session-notification.ts b/src/hooks/session-notification.ts
index 44b0142..0f7e375 100644
--- a/src/hooks/session-notification.ts
+++ b/src/hooks/session-notification.ts
@@ -1,5 +1,6 @@
 import type { PluginInput } from "@opencode-ai/plugin"
 import { platform } from "os"
+import { spawn } from "node:child_process"
 import { subagentSessions, getMainSessionID } from "../features/claude-code-session-state"
 import {
   getOsascriptPath,
@@ -11,6 +12,21 @@ import {
   startBackgroundCheck,
 } from "./session-notification-utils"
 
+/**
+ * Execute a command using node:child_process instead of Bun shell.
+ * This avoids Bun's ShellInterpreter GC bug on Windows (oven-sh/bun#23177, #24368).
+ */
+function execCommand(command: string, args: string[]): Promise<void> {
+  return new Promise((resolve) => {
+    const proc = spawn(command, args, {
+      stdio: "ignore",
+      detached: false,
+    })
+    proc.on("close", () => resolve())
+    proc.on("error", () => resolve())
+  })
+}
+
 interface Todo {
   content: string
   status: string
@@ -65,14 +81,17 @@ async function sendNotification(
 
       const esTitle = title.replace(/\\/g, "\\\\").replace(/"/g, '\\"')
       const esMessage = message.replace(/\\/g, "\\\\").replace(/"/g, '\\"')
-      await ctx.$`${osascriptPath} -e ${"display notification \"" + esMessage + "\" with title \"" + esTitle + "\""}`.catch(() => {})
+      const script = `display notification "${esMessage}" with title "${esTitle}"`
+      // Use node:child_process instead of Bun shell to avoid potential GC issues
+      await execCommand(osascriptPath, ["-e", script]).catch(() => {})
       break
     }
     case "linux": {
       const notifySendPath = await getNotifySendPath()
       if (!notifySendPath) return
 
-      await ctx.$`${notifySendPath} ${title} ${message} 2>/dev/null`.catch(() => {})
+      // Use node:child_process instead of Bun shell to avoid potential GC issues
+      await execCommand(notifySendPath, [title, message]).catch(() => {})
       break
     }
     case "win32": {
@@ -93,7 +112,8 @@ $Toast = [Windows.UI.Notifications.ToastNotification]::new($SerializedXml)
 $Notifier = [Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier('OpenCode')
 $Notifier.Show($Toast)
 `.trim().replace(/\n/g, "; ")
-      await ctx.$`${powershellPath} -Command ${toastScript}`.catch(() => {})
+      // Use node:child_process instead of Bun shell to avoid GC crash (oven-sh/bun#23177)
+      await execCommand(powershellPath, ["-Command", toastScript]).catch(() => {})
       break
     }
   }
@@ -104,17 +124,19 @@ async function playSound(ctx: PluginInput, p: Platform, soundPath: string): Prom
     case "darwin": {
       const afplayPath = await getAfplayPath()
       if (!afplayPath) return
-      ctx.$`${afplayPath} ${soundPath}`.catch(() => {})
+      // Use node:child_process instead of Bun shell to avoid potential GC issues
+      execCommand(afplayPath, [soundPath]).catch(() => {})
       break
     }
     case "linux": {
       const paplayPath = await getPaplayPath()
       if (paplayPath) {
-        ctx.$`${paplayPath} ${soundPath} 2>/dev/null`.catch(() => {})
+        // Use node:child_process instead of Bun shell to avoid potential GC issues
+        execCommand(paplayPath, [soundPath]).catch(() => {})
       } else {
         const aplayPath = await getAplayPath()
         if (aplayPath) {
-          ctx.$`${aplayPath} ${soundPath} 2>/dev/null`.catch(() => {})
+          execCommand(aplayPath, [soundPath]).catch(() => {})
         }
       }
       break
@@ -122,7 +144,9 @@ async function playSound(ctx: PluginInput, p: Platform, soundPath: string): Prom
     case "win32": {
       const powershellPath = await getPowershellPath()
       if (!powershellPath) return
-      ctx.$`${powershellPath} -Command ${"(New-Object Media.SoundPlayer '" + soundPath + "').PlaySync()"}`.catch(() => {})
+      // Use node:child_process instead of Bun shell to avoid GC crash (oven-sh/bun#23177)
+      const soundScript = `(New-Object Media.SoundPlayer '${soundPath.replace(/'/g, "''")}').PlaySync()`
+      execCommand(powershellPath, ["-Command", soundScript]).catch(() => {})
       break
     }
   }