Fix disappearing task names in history

- Handle edge case where tasks have no messages at all
- Provide fallback names for tasks with empty/blank names
- Ensure taskHistory entries are never blank, even after crashes
- Add proper error handling for incomplete tasks

Fixes cases where task history would show blank entries when:
- Task crashes before first message is added
- First message is malformed or empty
- Task creation fails completely

Author: kiwina

src/core/task-persistence/taskMetadata.ts

@@ -27,10 +27,33 @@ export async function taskMetadata({
 	workspace,
 }: TaskMetadataOptions) {
 	const taskDir = await getTaskDirectoryPath(globalStoragePath, taskId)
+
+	// Handle edge case where there are no messages at all
+	if (!messages || messages.length === 0) {
+		const historyItem: HistoryItem = {
+			id: taskId,
+			number: taskNumber,
+			ts: Date.now(),
+			task: `Task #${taskNumber} (No messages)`,
+			tokensIn: 0,
+			tokensOut: 0,
+			cacheWrites: 0,
+			cacheReads: 0,
+			totalCost: 0,
+			size: 0,
+			workspace,
+		}
+		return {
+			historyItem,
+			tokenUsage: { totalTokensIn: 0, totalTokensOut: 0, totalCacheWrites: 0, totalCacheReads: 0, totalCost: 0 },
+		}
+	}
+
 	const taskMessage = messages[0] // First message is always the task say.
 
 	const lastRelevantMessage =
-		messages[findLastIndex(messages, (m) => !(m.ask === "resume_task" || m.ask === "resume_completed_task"))]
+		messages[findLastIndex(messages, (m) => !(m.ask === "resume_task" || m.ask === "resume_completed_task"))] ||
+		messages[0]
 
 	let taskDirSize = taskSizeCache.get<number>(taskDir)
 
@@ -45,11 +68,17 @@ export async function taskMetadata({
 
 	const tokenUsage = getApiMetrics(combineApiRequests(combineCommandSequences(messages.slice(1))))
 
+	// Ensure task name is never blank - provide fallback names
+	let taskName = taskMessage.text?.trim() || ""
+	if (!taskName) {
+		taskName = `Task #${taskNumber} (Incomplete)`
+	}
+
 	const historyItem: HistoryItem = {
 		id: taskId,
 		number: taskNumber,
 		ts: lastRelevantMessage.ts,
-		task: taskMessage.text ?? "",
+		task: taskName,
 		tokensIn: tokenUsage.totalTokensIn,
 		tokensOut: tokenUsage.totalTokensOut,
 		cacheWrites: tokenUsage.totalCacheWrites,