fix: comprehensive orchestrator mode restoration for sub-tasks

- Enhanced resumePausedTask method with comprehensive mode restoration logic
- Added mode restoration safety net in finishSubTask method
- Improved mode validation and restoration in task resumption from history
- Added error handling for interrupted sub-tasks with mode restoration
- Ensures parent task mode is properly restored regardless of how sub-task ends

Fixes #5747

src/core/task/Task.ts

@@ -763,6 +763,35 @@ export class Task extends EventEmitter<ClineEvents> {
 		this.isPaused = false
 		this.emit("taskUnpaused")
 
+		// Restore the mode that was active when this task was paused
+		const provider = this.providerRef.deref()
+		if (provider && this.pausedModeSlug) {
+			try {
+				const currentState = await provider.getState()
+				const currentMode = currentState?.mode ?? defaultModeSlug
+
+				if (currentMode !== this.pausedModeSlug) {
+					provider.log(
+						`[subtasks] task ${this.taskId}.${this.instanceId} restoring mode from '${currentMode}' to '${this.pausedModeSlug}'`,
+					)
+
+					await provider.handleModeSwitch(this.pausedModeSlug)
+
+					// Delay to allow mode change to take effect
+					await delay(500)
+
+					provider.log(
+						`[subtasks] task ${this.taskId}.${this.instanceId} successfully restored to '${this.pausedModeSlug}' mode`,
+					)
+				}
+			} catch (error) {
+				provider.log(
+					`[subtasks] task ${this.taskId}.${this.instanceId} failed to restore mode to '${this.pausedModeSlug}': ${error}`,
+				)
+				// Continue execution even if mode restoration fails
+			}
+		}
+
 		// Fake an answer from the subtask that it has completed running and
 		// this is the result of what it has done  add the message to the chat
 		// history and to the webview ui.
@@ -795,6 +824,35 @@ export class Task extends EventEmitter<ClineEvents> {
 			modifiedClineMessages.splice(lastRelevantMessageIndex + 1)
 		}
 
+		// Restore mode if this task was paused with a specific mode
+		const provider = this.providerRef.deref()
+		if (provider && this.pausedModeSlug && this.pausedModeSlug !== defaultModeSlug) {
+			try {
+				const currentState = await provider.getState()
+				const currentMode = currentState?.mode ?? defaultModeSlug
+
+				if (currentMode !== this.pausedModeSlug) {
+					provider.log(
+						`[subtasks] task ${this.taskId}.${this.instanceId} resuming from history - restoring mode from '${currentMode}' to '${this.pausedModeSlug}'`,
+					)
+
+					await provider.handleModeSwitch(this.pausedModeSlug)
+
+					// Delay to allow mode change to take effect
+					await delay(500)
+
+					provider.log(
+						`[subtasks] task ${this.taskId}.${this.instanceId} successfully restored to '${this.pausedModeSlug}' mode from history`,
+					)
+				}
+			} catch (error) {
+				provider.log(
+					`[subtasks] task ${this.taskId}.${this.instanceId} failed to restore mode to '${this.pausedModeSlug}' from history: ${error}`,
+				)
+				// Continue execution even if mode restoration fails
+			}
+		}
+
 		// since we don't use api_req_finished anymore, we need to check if the last api_req_started has a cost value, if it doesn't and no cancellation reason to present, then we remove it since it indicates an api request without any partial content streamed
 		const lastApiReqStartedIndex = findLastIndex(
 			modifiedClineMessages,
@@ -1451,6 +1509,35 @@ export class Task extends EventEmitter<ClineEvents> {
 
 					await abortStream(cancelReason, streamingFailedMessage)
 
+					// Enhanced error handling for sub-tasks: ensure parent task mode is restored
+					// when a sub-task is interrupted
+					if (this.parentTask && provider) {
+						try {
+							const parentPausedMode = this.parentTask.pausedModeSlug
+							if (parentPausedMode && parentPausedMode !== defaultModeSlug) {
+								const currentState = await provider.getState()
+								const currentMode = currentState?.mode ?? defaultModeSlug
+
+								if (currentMode !== parentPausedMode) {
+									provider.log(
+										`[subtasks] sub-task ${this.taskId}.${this.instanceId} interrupted - restoring parent mode from '${currentMode}' to '${parentPausedMode}'`,
+									)
+
+									await provider.handleModeSwitch(parentPausedMode)
+
+									provider.log(
+										`[subtasks] successfully restored parent mode to '${parentPausedMode}' after sub-task interruption`,
+									)
+								}
+							}
+						} catch (modeError) {
+							provider.log(
+								`[subtasks] failed to restore parent mode after sub-task interruption: ${modeError}`,
+							)
+							// Continue execution even if mode restoration fails
+						}
+					}
+
 					const history = await provider?.getTaskWithId(this.taskId)
 
 					if (history) {

src/core/webview/ClineProvider.ts

@@ -228,8 +228,38 @@ export class ClineProvider
 	// this is used when a sub task is finished and the parent task needs to be resumed
 	async finishSubTask(lastMessage: string) {
 		console.log(`[subtasks] finishing subtask ${lastMessage}`)
+
+		// Get the parent task before removing the current one
+		const parentTask = this.clineStack.length > 1 ? this.clineStack[this.clineStack.length - 2] : undefined
+
 		// remove the last cline instance from the stack (this is the finished sub task)
 		await this.removeClineFromStack()
+
+		// Additional safety net: ensure mode is restored for the parent task
+		if (parentTask && parentTask.pausedModeSlug) {
+			try {
+				const currentState = await this.getState()
+				const currentMode = currentState?.mode ?? defaultModeSlug
+
+				if (currentMode !== parentTask.pausedModeSlug) {
+					this.log(
+						`[subtasks] finishSubTask: restoring mode from '${currentMode}' to '${parentTask.pausedModeSlug}' for parent task ${parentTask.taskId}`,
+					)
+
+					await this.handleModeSwitch(parentTask.pausedModeSlug)
+
+					this.log(
+						`[subtasks] finishSubTask: successfully restored mode to '${parentTask.pausedModeSlug}' for parent task ${parentTask.taskId}`,
+					)
+				}
+			} catch (error) {
+				this.log(
+					`[subtasks] finishSubTask: failed to restore mode to '${parentTask.pausedModeSlug}' for parent task ${parentTask.taskId}: ${error}`,
+				)
+				// Continue execution even if mode restoration fails
+			}
+		}
+
 		// resume the last cline instance in the stack (if it exists - this is the 'parent' calling task)
 		await this.getCurrentCline()?.resumePausedTask(lastMessage)
 	}