feat(features): add TaskToastManager for consolidated task notifications

- Create task-toast-manager feature with singleton pattern

- Show running task list (newest first) when new task starts

- Track queued tasks status from ConcurrencyManager

- Integrate with BackgroundManager and sisyphus-task tool

🤖 Generated with [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode) assistance

src/features/background-agent/manager.ts

@@ -13,6 +13,7 @@ import {
   MESSAGE_STORAGE,
 } from "../hook-message-injector"
 import { subagentSessions } from "../claude-code-session-state"
+import { getTaskToastManager } from "../task-toast-manager"
 
 const TASK_TTL_MS = 30 * 60 * 1000
 
@@ -122,17 +123,14 @@ export class BackgroundManager {
 
     log("[background-agent] Launching task:", { taskId: task.id, sessionID, agent: input.agent })
 
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const tuiClient = this.client as any
-    if (tuiClient.tui?.showToast) {
-      tuiClient.tui.showToast({
-        body: {
-          title: "Background Task Started",
-          message: `"${input.description}" running with ${input.agent}`,
-          variant: "info",
-          duration: 3000,
-        },
-      }).catch(() => {})
+    const toastManager = getTaskToastManager()
+    if (toastManager) {
+      toastManager.addTask({
+        id: task.id,
+        description: input.description,
+        agent: input.agent,
+        isBackground: true,
+      })
     }
 
     this.client.session.promptAsync({
@@ -378,17 +376,13 @@ export class BackgroundManager {
 
     log("[background-agent] notifyParentSession called for task:", task.id)
 
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const tuiClient = this.client as any
-    if (tuiClient.tui?.showToast) {
-      tuiClient.tui.showToast({
-        body: {
-          title: "Background Task Completed",
-          message: `Task "${task.description}" finished in ${duration}.`,
-          variant: "success",
-          duration: 5000,
-        },
-      }).catch(() => {})
+    const toastManager = getTaskToastManager()
+    if (toastManager) {
+      toastManager.showCompletionToast({
+        id: task.id,
+        description: task.description,
+        duration,
+      })
     }
 
     const message = `[BACKGROUND TASK COMPLETED] Task "${task.description}" finished in ${duration}. Use background_output with task_id="${task.id}" to get results.`

src/features/task-toast-manager/index.ts

@@ -0,0 +1,2 @@
+export { TaskToastManager, getTaskToastManager, initTaskToastManager } from "./manager"
+export type { TrackedTask, TaskStatus, TaskToastOptions } from "./types"

src/features/task-toast-manager/manager.ts

@@ -0,0 +1,190 @@
+import type { PluginInput } from "@opencode-ai/plugin"
+import type { TrackedTask, TaskStatus } from "./types"
+import type { ConcurrencyManager } from "../background-agent/concurrency"
+
+type OpencodeClient = PluginInput["client"]
+
+export class TaskToastManager {
+  private tasks: Map<string, TrackedTask> = new Map()
+  private client: OpencodeClient
+  private concurrencyManager?: ConcurrencyManager
+
+  constructor(client: OpencodeClient, concurrencyManager?: ConcurrencyManager) {
+    this.client = client
+    this.concurrencyManager = concurrencyManager
+  }
+
+  setConcurrencyManager(manager: ConcurrencyManager): void {
+    this.concurrencyManager = manager
+  }
+
+  /**
+   * Register a new task and show consolidated toast
+   */
+  addTask(task: {
+    id: string
+    description: string
+    agent: string
+    isBackground: boolean
+    status?: TaskStatus
+  }): void {
+    const trackedTask: TrackedTask = {
+      id: task.id,
+      description: task.description,
+      agent: task.agent,
+      status: task.status ?? "running",
+      startedAt: new Date(),
+      isBackground: task.isBackground,
+    }
+
+    this.tasks.set(task.id, trackedTask)
+    this.showTaskListToast(trackedTask)
+  }
+
+  /**
+   * Update task status
+   */
+  updateTask(id: string, status: TaskStatus): void {
+    const task = this.tasks.get(id)
+    if (task) {
+      task.status = status
+    }
+  }
+
+  /**
+   * Remove completed/error task
+   */
+  removeTask(id: string): void {
+    this.tasks.delete(id)
+  }
+
+  /**
+   * Get all running tasks (newest first)
+   */
+  getRunningTasks(): TrackedTask[] {
+    const running = Array.from(this.tasks.values())
+      .filter((t) => t.status === "running")
+      .sort((a, b) => b.startedAt.getTime() - a.startedAt.getTime())
+    return running
+  }
+
+  /**
+   * Get all queued tasks
+   */
+  getQueuedTasks(): TrackedTask[] {
+    return Array.from(this.tasks.values())
+      .filter((t) => t.status === "queued")
+      .sort((a, b) => a.startedAt.getTime() - b.startedAt.getTime())
+  }
+
+  /**
+   * Format duration since task started
+   */
+  private formatDuration(startedAt: Date): string {
+    const seconds = Math.floor((Date.now() - startedAt.getTime()) / 1000)
+    if (seconds < 60) return `${seconds}s`
+    const minutes = Math.floor(seconds / 60)
+    if (minutes < 60) return `${minutes}m ${seconds % 60}s`
+    const hours = Math.floor(minutes / 60)
+    return `${hours}h ${minutes % 60}m`
+  }
+
+  /**
+   * Build task list message
+   */
+  private buildTaskListMessage(newTask: TrackedTask): string {
+    const running = this.getRunningTasks()
+    const queued = this.getQueuedTasks()
+
+    const lines: string[] = []
+
+    if (running.length > 0) {
+      lines.push(`Running (${running.length}):`)
+      for (const task of running) {
+        const duration = this.formatDuration(task.startedAt)
+        const bgIcon = task.isBackground ? "⚡" : "🔄"
+        const isNew = task.id === newTask.id ? " ← NEW" : ""
+        lines.push(`${bgIcon} ${task.description} (${task.agent}) - ${duration}${isNew}`)
+      }
+    }
+
+    if (queued.length > 0) {
+      if (lines.length > 0) lines.push("")
+      lines.push(`Queued (${queued.length}):`)
+      for (const task of queued) {
+        const bgIcon = task.isBackground ? "⏳" : "⏸️"
+        lines.push(`${bgIcon} ${task.description} (${task.agent})`)
+      }
+    }
+
+    return lines.join("\n")
+  }
+
+  /**
+   * Show consolidated toast with all running/queued tasks
+   */
+  private showTaskListToast(newTask: TrackedTask): void {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const tuiClient = this.client as any
+    if (!tuiClient.tui?.showToast) return
+
+    const message = this.buildTaskListMessage(newTask)
+    const running = this.getRunningTasks()
+    const queued = this.getQueuedTasks()
+
+    const title = newTask.isBackground
+      ? `⚡ New Background Task`
+      : `🔄 New Task Executed`
+
+    tuiClient.tui.showToast({
+      body: {
+        title,
+        message: message || `${newTask.description} (${newTask.agent})`,
+        variant: "info",
+        duration: running.length + queued.length > 2 ? 5000 : 3000,
+      },
+    }).catch(() => {})
+  }
+
+  /**
+   * Show task completion toast
+   */
+  showCompletionToast(task: { id: string; description: string; duration: string }): void {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const tuiClient = this.client as any
+    if (!tuiClient.tui?.showToast) return
+
+    this.removeTask(task.id)
+
+    const remaining = this.getRunningTasks()
+    const queued = this.getQueuedTasks()
+
+    let message = `✅ "${task.description}" finished in ${task.duration}`
+    if (remaining.length > 0 || queued.length > 0) {
+      message += `\n\nStill running: ${remaining.length} | Queued: ${queued.length}`
+    }
+
+    tuiClient.tui.showToast({
+      body: {
+        title: "Task Completed",
+        message,
+        variant: "success",
+        duration: 5000,
+      },
+    }).catch(() => {})
+  }
+}
+
+let instance: TaskToastManager | null = null
+
+export function getTaskToastManager(): TaskToastManager | null {
+  return instance
+}
+
+export function initTaskToastManager(
+  client: OpencodeClient,
+  concurrencyManager?: ConcurrencyManager
+): TaskToastManager {
+  instance = new TaskToastManager(client, concurrencyManager)
+  return instance
+}

src/features/task-toast-manager/types.ts

@@ -0,0 +1,17 @@
+export type TaskStatus = "running" | "queued" | "completed" | "error"
+
+export interface TrackedTask {
+  id: string
+  description: string
+  agent: string
+  status: TaskStatus
+  startedAt: Date
+  isBackground: boolean
+}
+
+export interface TaskToastOptions {
+  title: string
+  message: string
+  variant: "info" | "success" | "warning" | "error"
+  duration?: number
+}