refactor(background-notification): remove chat.message handler

- Remove unused chat message notification handler
- Remove formatDuration and formatNotifications helpers
- Simplify to event-only handling
- Remove chat.message hook call from main plugin

Background task notifications now rely on event-based system only.

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

.gitignore

@@ -27,3 +27,4 @@ yarn.lock
 .env.local
 test-injection/
 notepad.md
+oauth-success.html

src/hooks/background-notification/index.ts

@@ -1,4 +1,4 @@
-import type { BackgroundManager, BackgroundTask } from "../../features/background-agent"
+import type { BackgroundManager } from "../../features/background-agent"
 
 interface Event {
   type: string
@@ -9,94 +9,13 @@ interface EventInput {
   event: Event
 }
 
-interface ChatMessageInput {
-  sessionID: string
-  [key: string]: unknown
-}
-
-interface ChatMessageOutput {
-  parts: Array<{ type: string; text?: string; [key: string]: unknown }>
-  [key: string]: unknown
-}
-
-function formatDuration(start: Date, end?: Date): string {
-  const duration = (end ?? new Date()).getTime() - start.getTime()
-  const seconds = Math.floor(duration / 1000)
-  const minutes = Math.floor(seconds / 60)
-  const hours = Math.floor(minutes / 60)
-
-  if (hours > 0) {
-    return `${hours}h ${minutes % 60}m ${seconds % 60}s`
-  } else if (minutes > 0) {
-    return `${minutes}m ${seconds % 60}s`
-  } else {
-    return `${seconds}s`
-  }
-}
-
-function formatNotifications(tasks: BackgroundTask[]): string {
-  if (tasks.length === 0) {
-    return ""
-  }
-
-  if (tasks.length > 1) {
-    let message = `**Background Tasks Complete (${tasks.length})**\n\n`
-
-    for (const task of tasks) {
-      const duration = formatDuration(task.startedAt, task.completedAt)
-      const toolCalls = task.progress?.toolCalls ?? 0
-
-      message += `• **${task.id}** - ${task.description}\n`
-      message += `  Duration: ${duration} | Tool calls: ${toolCalls}\n\n`
-    }
-
-    message += `Use \`background_output\` tool to retrieve results.`
-
-    return message
-  }
-
-  const task = tasks[0]
-  const duration = formatDuration(task.startedAt, task.completedAt)
-  const toolCalls = task.progress?.toolCalls ?? 0
-
-  return `**Background Task Complete**
-
-**Task ID:** ${task.id}
-**Description:** ${task.description}
-**Duration:** ${duration}
-**Tool calls:** ${toolCalls}
-
-Use \`background_output\` tool with task_id="${task.id}" to retrieve the full result.`
-}
-
 export function createBackgroundNotificationHook(manager: BackgroundManager) {
   const eventHandler = async ({ event }: EventInput) => {
     manager.handleEvent(event)
   }
 
-  const chatMessageHandler = async (
-    input: ChatMessageInput,
-    output: ChatMessageOutput
-  ) => {
-    const notifications = manager.getPendingNotifications(input.sessionID)
-
-    if (notifications.length === 0) {
-      return
-    }
-
-    const message = formatNotifications(notifications)
-
-    output.parts.unshift({
-      type: "text",
-      text: message,
-    })
-
-    manager.clearNotifications(input.sessionID)
-  }
-
   return {
     event: eventHandler,
-    "chat.message": chatMessageHandler,
   }
 }
 

src/index.ts

@@ -180,7 +180,6 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
 
     "chat.message": async (input, output) => {
       await claudeCodeHooks["chat.message"]?.(input, output);
-      await backgroundNotificationHook["chat.message"](input, output);
     },
 
     config: async (config) => {